Old Carco LLC
Old CarcoActive Patents
0
Total Holdings
192
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| DE2732471A1 | ELECTRONIC ENGINE CONTROL SYSTEM | Expired / Lapsed | 1977-07-19 | — | 0 | Details |
| GB1484845A | Variable inductance transducer | Expired / Lapsed | 1976-03-17 | — | 0 | Details |
| US5097140A | Alternator starter | Expired / Lapsed | 1991-05-07 | 1992-03-17 | 27 | Details |
| US4644822A | Transfer case for vehicle drivetrains | Expired / Lapsed | 1985-02-11 | 1987-02-24 | 12 | Details |
| US4602760A | Fuel line bundle clamp | Expired / Lapsed | 1983-11-28 | 1986-07-29 | 8 | Details |
| US4577534A | Front suspension alignment tool | Expired / Lapsed | 1985-04-01 | 1986-03-25 | 4 | Details |
| US4525850A | Fluid level sensor employing hot wire probe and digital sam… | Expired / Lapsed | 1982-09-15 | 1985-06-25 | 4 | Details |
| US4185844A | Fuel tank filler tube assembly | Expired / Lapsed | 1978-04-24 | 1980-01-29 | 10 | Details |
| US4011848A | Fuel filter and roll-over valve | Expired / Lapsed | 1975-08-15 | 1977-03-15 | 8 | Details |
| US3976341A | Seal | Expired / Lapsed | 1975-07-21 | 1976-08-24 | 11 | Details |
| US3857149A | Method of making a ball joint | Expired / Lapsed | 1973-12-03 | 1974-12-31 | 3 | Details |
| US3601614A | Automatic anti-glare rearview mirror system | Expired / Lapsed | 1970-05-25 | 1971-08-24 | 17 | Details |
| US3581702A | Trim and tilt mechanism for outboard propulsion unit | Expired / Lapsed | 1969-07-28 | 1971-06-01 | 22 | Details |
| US3546527A | Headlamp time delay circuit controller | Expired / Lapsed | 1968-09-30 | 1970-12-08 | 0 | Details |
| US3508467A | Power steering gear | Expired / Lapsed | 1968-02-12 | 1970-04-28 | 0 | Details |
| US3493002A | Coupling apparatus | Expired / Lapsed | 1967-12-11 | 1970-02-03 | 0 | Details |
| US3450853A | Magnetically operated signal switch for hydraulic brake sys… | Expired / Lapsed | 1967-04-26 | 1969-06-17 | 0 | Details |
| US3415266A | Power steering flow control device | Expired / Lapsed | 1966-12-01 | 1968-12-10 | 2 | Details |
| US3415155A | Bushing | Expired / Lapsed | 1966-08-01 | 1968-12-10 | 0 | Details |
| US3359866A | Power steering gear | Expired / Lapsed | 1965-12-28 | 1967-12-26 | 2 | Details |
| US3347723A | Laminating process and apparatus | Expired / Lapsed | 1963-04-25 | 1967-10-17 | 2 | Details |
| US3320968A | Flow control device | Expired / Lapsed | 1964-05-04 | 1967-05-23 | 2 | Details |
| US3313573A | Low friction seat belt release | Expired / Lapsed | 1965-03-25 | 1967-04-11 | 2 | Details |
| US3303988A | Compressor capacity control | Expired / Lapsed | 1964-01-08 | 1967-02-14 | 2 | Details |
| US3163006A | Flow control device | Expired / Lapsed | 1964-01-24 | 1964-12-29 | 2 | Details |
| US3152250A | Circuit for performing the combined functions of the extrac… | Expired / Lapsed | 1962-07-20 | 1964-10-06 | 2 | Details |
| US3151852A | Process for obtaining metal carbide coatings on base materi… | Expired / Lapsed | 1958-07-09 | 1964-10-06 | 1 | Details |
| US3148669A | Exhaust gas heated system for engine intake manifold | Expired / Lapsed | 1960-06-13 | 1964-09-15 | 2 | Details |
| US3127586A | Lubrication warning signal | Expired / Lapsed | 1962-06-01 | 1964-03-31 | 1 | Details |
| US3099188A | Power steering gear | Expired / Lapsed | 1959-12-29 | 1963-07-30 | 2 | Details |
| US3094010A | Power steering gear | Expired / Lapsed | 1960-02-11 | 1963-06-18 | 2 | Details |
| US3089734A | Frequency operated brake anti-skid device | Expired / Lapsed | 1961-01-23 | 1963-05-14 | 2 | Details |
| US3070072A | Power steering gear | Expired / Lapsed | 1961-01-16 | 1962-12-25 | 0 | Details |
| US3049141A | Accumulator charging mechanism | Expired / Lapsed | 1959-05-18 | 1962-08-14 | 0 | Details |
| US3038825A | Laminating bag | Expired / Lapsed | 1959-10-21 | 1962-06-12 | 4 | Details |
| US2992953A | Glass laminating de-airing means | Expired / Lapsed | 1960-02-23 | 1961-07-18 | 2 | Details |
| US2974255A | Electronic control device | Expired / Lapsed | 1953-06-05 | 1961-03-07 | 0 | Details |
| US2962195A | Pressure vessel | Expired / Lapsed | 1955-03-11 | 1960-11-29 | 0 | Details |
| US2957467A | Fuel metering system | Expired / Lapsed | 1958-08-25 | 1960-10-25 | 0 | Details |
| US2933160A | Power brake system emergency control | Expired / Lapsed | 1955-12-22 | 1960-04-19 | 0 | Details |
| US2930358A | Power boosting mechanism with feelback pressure limiting va… | Expired / Lapsed | 1955-11-18 | 1960-03-29 | 0 | Details |
| US2849889A | Transmission and controls therefor | Expired / Lapsed | 1952-01-25 | 1958-09-02 | 0 | Details |
| US2837167A | Power steering mechanism of the hydraulic type | Expired / Lapsed | 1953-11-10 | 1958-06-03 | 0 | Details |
| US2828721A | Fluid pressure actuated power booster apparatus having vari… | Expired / Lapsed | 1955-12-08 | 1958-04-01 | 0 | Details |
| US2817251A | Positive drive differential | Expired / Lapsed | 1955-03-10 | 1957-12-24 | 0 | Details |
| US2801619A | Power steering unit having simplified control valve | Expired / Lapsed | 1955-09-12 | 1957-08-06 | 0 | Details |
| US2799455A | Automatic choke mechanism | Expired / Lapsed | 1951-04-11 | 1957-07-16 | 0 | Details |
| US2788678A | Transmission control system | Expired / Lapsed | 1953-04-13 | 1957-04-16 | 0 | Details |
| US2770453A | Automotive vehicle stabilizing means | Expired / Lapsed | 1952-09-09 | 1956-11-13 | 0 | Details |
| US2755778A | Power steering unit | Expired / Lapsed | 1952-04-18 | 1956-07-24 | 0 | Details |
| US2726556A | Hydrodynamic transmission | Expired / Lapsed | 1950-05-25 | 1955-12-13 | 0 | Details |
| US2722199A | Hydraulic power boosting mechanism | Expired / Lapsed | 1954-06-29 | 1955-11-01 | 0 | Details |
| US2722203A | Intake manifold for v-engines | Expired / Lapsed | 1952-08-22 | 1955-11-01 | 0 | Details |
| US2711828A | Plastic fabric filter | Expired / Lapsed | 1949-09-30 | 1955-06-28 | 0 | Details |
| US2710596A | Power steering mechanism | Expired / Lapsed | 1952-10-04 | 1955-06-14 | 0 | Details |
| US2707865A | Rotor shaft construction | Expired / Lapsed | 1950-06-02 | 1955-05-10 | 0 | Details |
| US2707887A | Hydrodynamic power transmission | Expired / Lapsed | 1949-03-30 | 1955-05-10 | 0 | Details |
| US2705655A | Hood lacing | Expired / Lapsed | 1951-04-04 | 1955-04-05 | 0 | Details |
| US2695695A | Electromagnetically operated clutch or brake | Expired / Lapsed | 1950-05-31 | 1954-11-30 | 0 | Details |
| US2695696A | Transmission clutch control mechanism | Expired / Lapsed | 1950-02-06 | 1954-11-30 | 0 | Details |
| US2678210A | Bumper assembly | Expired / Lapsed | 1950-03-20 | 1954-05-11 | 0 | Details |
| US2667602A | Vehicle directional signal system | Expired / Lapsed | 1950-05-25 | 1954-01-26 | 0 | Details |
| US2667085A | Hydrodynamic transmission | Expired / Lapsed | 1950-03-18 | 1954-01-26 | 0 | Details |
| US2641439A | Cooled turbine or compressor blade | Expired / Lapsed | 1947-10-01 | 1953-06-09 | 0 | Details |
| US2640694A | Window regulator | Expired / Lapsed | 1950-08-04 | 1953-06-02 | 0 | Details |
| US2638265A | Compressor unloading apparatus | Expired / Lapsed | 1948-01-03 | 1953-05-12 | 0 | Details |
| US2635704A | Vehicle suspension for driven wheels | Expired / Lapsed | 1949-06-14 | 1953-04-21 | 0 | Details |
| US2631517A | Heater | Expired / Lapsed | 1949-08-13 | 1953-03-17 | 0 | Details |
| US2621919A | Wheel suspension | Expired / Lapsed | 1946-11-30 | 1952-12-16 | 0 | Details |
| US2609611A | Apparatus for adjusting vehicle headlamps | Expired / Lapsed | 1950-04-13 | 1952-09-09 | 0 | Details |
| US2609662A | Controlled dashpot for fuel metering devices | Expired / Lapsed | 1947-07-25 | 1952-09-09 | 0 | Details |
| US2603065A | Power steering mechanism | Expired / Lapsed | 1949-10-28 | 1952-07-15 | 0 | Details |
| US2599440A | Method for installing resilient seals | Expired / Lapsed | 1948-01-31 | 1952-06-03 | 0 | Details |
| US2592400A | Heater | Expired / Lapsed | 1946-06-10 | 1952-04-08 | 0 | Details |
| US2588630A | Testing apparatus | Expired / Lapsed | 1949-07-29 | 1952-03-11 | 0 | Details |
| US2567153A | Window structure | Expired / Lapsed | 1949-08-25 | 1951-09-04 | 0 | Details |
| US2562624A | Stuffing box for boats | Expired / Lapsed | 1949-07-07 | 1951-07-31 | 0 | Details |
| US2559859A | Supercharged engine control | Expired / Lapsed | 1948-12-11 | 1951-07-10 | 0 | Details |
| US2556011A | Method of making a cellular structural panel and product | Expired / Lapsed | 1947-05-05 | 1951-06-05 | 1 | Details |
| US2551746A | Hydrodynamic transmission | Expired / Lapsed | 1948-05-08 | 1951-05-08 | 0 | Details |
| US2551742A | Power assisted steering | Expired / Lapsed | 1947-10-16 | 1951-05-08 | 0 | Details |
| US2548207A | Torque converter | Expired / Lapsed | 1948-07-10 | 1951-04-10 | 0 | Details |
| US2544544A | Heating system | Expired / Lapsed | 1946-05-28 | 1951-03-06 | 0 | Details |
| US2540957A | Room air conditioner mixing fresh and recirculated air | Expired / Lapsed | 1947-04-12 | 1951-02-06 | 0 | Details |
| US2528796A | Valve mechanism | Expired / Lapsed | 1944-12-29 | 1950-11-07 | 0 | Details |
| US2528738A | Fuel burner flame plate | Expired / Lapsed | 1944-11-27 | 1950-11-07 | 0 | Details |
| US2525190A | Steering-by-driving mechanism and electric control therefor | Expired / Lapsed | 1944-11-18 | 1950-10-10 | 0 | Details |
| US2522762A | Compressor unloading mechanism | Expired / Lapsed | 1947-11-15 | 1950-09-19 | 0 | Details |
| US2493591A | Stoker alarm and control | Expired / Lapsed | 1946-05-27 | 1950-01-03 | 0 | Details |
| US2488228A | Firing switch for rocket launchers | Expired / Lapsed | 1947-05-27 | 1949-11-15 | 0 | Details |
| US2481088A | Valve structure | Expired / Lapsed | 1944-12-29 | 1949-09-06 | 0 | Details |
| US2471813A | Injection molding apparatus | Expired / Lapsed | 1944-09-28 | 1949-05-31 | 0 | Details |
| US2463865A | Pumping limit control apparatus | Expired / Lapsed | 1944-06-05 | 1949-03-08 | 0 | Details |
| US2457692A | Hydrodynamic transmission | Expired / Lapsed | 1943-12-06 | 1948-12-28 | 0 | Details |
| US2455343A | Joint | Expired / Lapsed | 1945-04-11 | 1948-11-30 | 0 | Details |
| US2455292A | Control apparatus | Expired / Lapsed | 1944-04-13 | 1948-11-30 | 0 | Details |
| US2453812A | Actuating valve with opposed unequal areas | Expired / Lapsed | 1944-05-15 | 1948-11-16 | 0 | Details |
| US2450896A | Power transmission mechanism | Expired / Lapsed | 1944-04-12 | 1948-10-12 | 0 | Details |
| US2449888A | Compressor drive control | Expired / Lapsed | 1944-09-11 | 1948-09-21 | 0 | Details |
| US2447133A | Frequency conversion system | Expired / Lapsed | 1944-11-30 | 1948-08-17 | 0 | Details |
| US2437646A | Turret traversing mechanism | Expired / Lapsed | 1943-08-05 | 1948-03-09 | 0 | Details |
| US2426234A | Power transmission | Expired / Lapsed | 1942-06-26 | 1947-08-26 | 0 | Details |
| US2411398A | Plastic molding | Expired / Lapsed | 1942-08-05 | 1946-11-19 | 0 | Details |
| US2409533A | Apparatus for controlling superchargers | Expired / Lapsed | 1944-01-19 | 1946-10-15 | 0 | Details |
| US2407915A | Injection nozzle | Expired / Lapsed | 1942-08-20 | 1946-09-17 | 0 | Details |
| US2405458A | Vehicle wheel connecting joint | Expired / Lapsed | 1945-02-19 | 1946-08-06 | 0 | Details |
| US2405400A | Releasable pin | Expired / Lapsed | 1944-11-11 | 1946-08-06 | 0 | Details |
| US2404324A | Supercharger control apparatus | Expired / Lapsed | 1942-05-06 | 1946-07-16 | 0 | Details |
| US2404323A | Supercharger control apparatus | Expired / Lapsed | 1942-01-01 | 1946-07-16 | 0 | Details |
| US2402885A | Apparatus for controlling the power plants of aircraft | Expired / Lapsed | 1943-03-27 | 1946-06-25 | 0 | Details |
| US2402805A | Plastic injection apparatus and method | Expired / Lapsed | 1943-01-08 | 1946-06-25 | 0 | Details |
| US2400055A | Tube forming apparatus and method | Expired / Lapsed | 1943-10-23 | 1946-05-07 | 0 | Details |
| US2376511A | Method of making synthetic resin yarn | Expired / Lapsed | 1941-05-23 | 1945-05-22 | 0 | Details |
| US2373122A | Hydrodynamic transmission | Expired / Lapsed | 1942-04-16 | 1945-04-10 | 0 | Details |
| US2372453A | Electric machine | Expired / Lapsed | 1944-03-31 | 1945-03-27 | 0 | Details |
| US2371847A | Apparatus and method for bonding composite articles | Expired / Lapsed | 1942-12-18 | 1945-03-20 | 0 | Details |
| US2360530A | Motor vehicle lighting | Expired / Lapsed | 1941-10-10 | 1944-10-17 | 0 | Details |
| US2359555A | Coupling | Expired / Lapsed | 1941-10-30 | 1944-10-03 | 0 | Details |
| US2342960A | Power transmission | Expired / Lapsed | 1942-04-04 | 1944-02-29 | 0 | Details |
| US2329931A | Compressor control means | Expired / Lapsed | 1941-11-26 | 1943-09-21 | 0 | Details |
| US2324742A | Motor vehicle lighting | Expired / Lapsed | 1941-07-03 | 1943-07-20 | 0 | Details |
| US2322904A | Casement window adapter | Expired / Lapsed | 1940-07-08 | 1943-06-29 | 0 | Details |
| US2319456A | Material handling device | Expired / Lapsed | 1942-03-26 | 1943-05-18 | 0 | Details |
| US2317182A | Indicating instrument | Expired / Lapsed | 1941-01-16 | 1943-04-20 | 0 | Details |
| US2306823A | Lubricating system | Expired / Lapsed | 1941-02-18 | 1942-12-29 | 0 | Details |
| US2306796A | Heater | Expired / Lapsed | 1939-10-07 | 1942-12-29 | 0 | Details |
| US2299935A | Control arm | Expired / Lapsed | 1941-02-24 | 1942-10-27 | 0 | Details |
| US2299934A | Inductive heating apparatus and method | Expired / Lapsed | 1940-12-16 | 1942-10-27 | 0 | Details |
| US2299877A | Method of making porous metal frictional material | Expired / Lapsed | 1939-11-10 | 1942-10-27 | 0 | Details |
| US2299883A | Fluid coupling | Expired / Lapsed | 1938-12-30 | 1942-10-27 | 0 | Details |
| US2296646A | Throttle control | Expired / Lapsed | 1940-10-09 | 1942-09-22 | 0 | Details |
| US2293790A | Circuit controlling apparatus | Expired / Lapsed | 1939-12-28 | 1942-08-25 | 0 | Details |
| US2291124A | Vehicle ventilating and heating system | Expired / Lapsed | 1940-05-23 | 1942-07-28 | 0 | Details |
| US2290973A | Air conditioning unit | Expired / Lapsed | 1939-11-13 | 1942-07-28 | 0 | Details |
| US2287606A | Fastening device | Expired / Lapsed | 1940-07-08 | 1942-06-23 | 0 | Details |
| US2284123A | Fluid coupling | Expired / Lapsed | 1941-04-25 | 1942-05-26 | 0 | Details |
| US2282015A | Air conditioning unit | Expired / Lapsed | 1939-11-13 | 1942-05-05 | 0 | Details |
| US2277800A | Power transmission | Expired / Lapsed | 1940-10-19 | 1942-03-31 | 0 | Details |
| US2267431A | Flexible exhaust pipe suspension | Expired / Lapsed | 1939-08-07 | 1941-12-23 | 0 | Details |
| US2267433A | Weather strip | Expired / Lapsed | 1938-10-31 | 1941-12-23 | 0 | Details |
| US2264013A | Windshield wiper control | Expired / Lapsed | 1939-06-09 | 1941-11-25 | 0 | Details |
| US2256960A | Power transmission | Expired / Lapsed | 1939-12-11 | 1941-09-23 | 0 | Details |
| US2246833A | Vehicle steering mechanism | Expired / Lapsed | 1938-09-17 | 1941-06-24 | 0 | Details |
| US2242027A | Transmission interlock | Expired / Lapsed | 1940-01-18 | 1941-05-13 | 0 | Details |
| US2238746A | Power transmission | Expired / Lapsed | 1938-07-29 | 1941-04-15 | 0 | Details |
| US2232797A | Power transmission | Expired / Lapsed | 1938-01-21 | 1941-02-25 | 0 | Details |
| US2229352A | Car jacking device | Expired / Lapsed | 1939-07-08 | 1941-01-21 | 0 | Details |
| US2229336A | Power transmission | Expired / Lapsed | 1938-01-21 | 1941-01-21 | 0 | Details |
| US2222252A | Electrical connector | Expired / Lapsed | 1939-07-18 | 1940-11-19 | 0 | Details |
| US2218809A | Porous metal forming apparatus | Expired / Lapsed | 1938-03-03 | 1940-10-22 | 0 | Details |
| US2215667A | Rectifier | Expired / Lapsed | 1939-02-18 | 1940-09-24 | 0 | Details |
| US2205470A | Power transmission | Expired / Lapsed | 1937-10-26 | 1940-06-25 | 0 | Details |
| US2190298A | Wheel suspension | Expired / Lapsed | 1936-08-26 | 1940-02-13 | 0 | Details |
| US2182385A | Clutch | Expired / Lapsed | 1936-08-26 | 1939-12-05 | 0 | Details |
| US2177872A | Power transmission | Expired / Lapsed | 1935-07-15 | 1939-10-31 | 0 | Details |
| US2162828A | Wheel suspension | Expired / Lapsed | 1937-05-05 | 1939-06-20 | 0 | Details |
| US2162785A | Power transmission | Expired / Lapsed | 1936-09-02 | 1939-06-20 | 0 | Details |
| US2159426A | Power transmission | Expired / Lapsed | 1936-03-06 | 1939-05-23 | 0 | Details |
| US2129828A | Pump | Expired / Lapsed | 1935-07-05 | 1938-09-13 | 0 | Details |
| US2127655A | Planetary transmission | Expired / Lapsed | 1935-04-19 | 1938-08-23 | 0 | Details |
| US2127323A | Vehicle body element | Expired / Lapsed | 1936-03-06 | 1938-08-16 | 0 | Details |
| US2127354A | Power transmission | Expired / Lapsed | 1935-01-19 | 1938-08-16 | 0 | Details |
| US2119992A | Reflector device | Expired / Lapsed | 1935-04-17 | 1938-06-07 | 0 | Details |
| US2117141A | Vehicle electric power supply system | Expired / Lapsed | 1934-07-12 | 1938-05-10 | 0 | Details |
| US2115919A | Vehicle wheel suspension | Expired / Lapsed | 1934-08-04 | 1938-05-03 | 0 | Details |
| US2105742A | Motor vehicle | Expired / Lapsed | 1936-02-13 | 1938-01-18 | 0 | Details |
| US2091025A | Electric speedometer | Expired / Lapsed | 1934-11-17 | 1937-08-24 | 0 | Details |
| US2077580A | Power transmitting device | Expired / Lapsed | 1934-09-19 | 1937-04-20 | 0 | Details |
| US2074170A | Power transmitting device | Expired / Lapsed | 1935-03-14 | 1937-03-16 | 0 | Details |
| US2072379A | Motor vehicle power transmission | Expired / Lapsed | 1934-04-18 | 1937-03-02 | 0 | Details |
| US2071292A | Motor vehicle power transmission | Expired / Lapsed | 1934-04-18 | 1937-02-16 | 0 | Details |
| US2062007A | Automatic transmission restoring apparatus | Expired / Lapsed | 1933-09-25 | 1936-11-24 | 0 | Details |
| US2055303A | Motor vehicle power transmission | Expired / Lapsed | 1934-03-01 | 1936-09-22 | 0 | Details |
| US2055325A | Power transmission | Expired / Lapsed | 1934-01-31 | 1936-09-22 | 0 | Details |
| US2052010A | Induction heating apparatus | Expired / Lapsed | 1934-08-04 | 1936-08-25 | 0 | Details |
| US2037749A | Direct bonding of rubber and metal | Expired / Lapsed | 1934-12-27 | 1936-04-21 | 0 | Details |
| US2024459A | Driving mechanism | Expired / Lapsed | 1933-07-27 | 1935-12-17 | 0 | Details |
| US2016150A | Tire and rim assembly | Expired / Lapsed | 1931-10-12 | 1935-10-01 | 0 | Details |
| US1966599A | Snap-on bearing clip | Expired / Lapsed | 1933-01-03 | 1934-07-17 | 0 | Details |
| US1967031A | Method of coating articles | Expired / Lapsed | 1930-11-22 | 1934-07-17 | 0 | Details |
| US1962746A | Vibration damper | Expired / Lapsed | 1929-06-27 | 1934-06-12 | 0 | Details |
| US1952695A | Composite grommet | Expired / Lapsed | 1930-01-29 | 1934-03-27 | 0 | Details |
| US1918127A | Frictional lining extruding apparatus and method | Expired / Lapsed | 1930-10-25 | 1933-07-11 | 0 | Details |
| US1872547A | Brake shoe | Expired / Lapsed | 1929-11-09 | 1932-08-16 | 0 | Details |
| US1862153A | Pipe joint | Expired / Lapsed | 1929-09-20 | 1932-06-07 | 0 | Details |
| US1856646A | Oscillating joint | Expired / Lapsed | 1930-02-17 | 1932-05-03 | 0 | Details |
| US1835048A | Seat | Expired / Lapsed | 1927-12-12 | 1931-12-08 | 0 | Details |
| US1800578A | Grommet | Expired / Lapsed | 1929-10-02 | 1931-04-14 | 0 | Details |
| US1792066A | Welding machine | Expired / Lapsed | 1929-07-26 | 1931-02-10 | 0 | Details |
| US1748736A | Motor-vehicle top | Expired / Lapsed | 1926-10-22 | 1930-02-25 | 0 | Details |
| US1748702A | Motor vehicle | Expired / Lapsed | 1926-08-06 | 1930-02-25 | 0 | Details |
| US1712831A | Heat-treating furnace | Expired / Lapsed | 1927-06-25 | 1929-05-14 | 0 | Details |