Sprague Electric Co
Sprague ElActive Patents
0
Total Holdings
86
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3878501A | Asymmetrical dual PTCR package for motor start system | Expired / Lapsed | 1974-01-02 | 1975-04-15 | 4 | Details |
| US3835434A | Ptc resistor package | Expired / Lapsed | 1973-06-04 | 1974-09-10 | 11 | Details |
| US3686473A | Heated rear-view mirror | Expired / Lapsed | 1971-03-25 | 1972-08-22 | 9 | Details |
| US3615873A | Method of stabilizing mos devices | Expired / Lapsed | 1969-06-03 | 1971-10-26 | 4 | Details |
| US3607697A | Sputtering process for making a film of silica and silicon … | Expired / Lapsed | 1968-04-18 | 1971-09-21 | 2 | Details |
| US3604900A | Electronic credit card | Expired / Lapsed | 1969-07-07 | 1971-09-14 | 3 | Details |
| US3568127A | Electrical resistors | Expired / Lapsed | 1968-10-28 | 1971-03-02 | 16 | Details |
| US3548269A | Resistive layer semiconductive device | Expired / Lapsed | 1968-12-03 | 1970-12-15 | 0 | Details |
| US3516242A | Visual display of time variable electric information | Expired / Lapsed | 1968-02-23 | 1970-06-23 | 0 | Details |
| US3483356A | Thermal printing head | Expired / Lapsed | 1968-06-27 | 1969-12-09 | 0 | Details |
| US3481776A | Ion implantation to form conductive contact | Expired / Lapsed | 1966-07-18 | 1969-12-02 | 0 | Details |
| US3478191A | Thermal print head | Expired / Lapsed | 1967-01-23 | 1969-11-11 | 0 | Details |
| US3467828A | A.c. latching circuit for scr having photoresistive latching | Expired / Lapsed | 1966-12-21 | 1969-09-16 | 0 | Details |
| US3416248A | Electro-chemical optical display | Expired / Lapsed | 1966-11-02 | 1968-12-17 | 0 | Details |
| US3390019A | Method of making a semiconductor by ionic bombardment | Expired / Lapsed | 1964-12-24 | 1968-06-25 | 0 | Details |
| US3386016A | Field effect transistor with an induced p-type channel by m… | Expired / Lapsed | 1965-08-02 | 1968-05-28 | 0 | Details |
| US3385682A | Method and reagent for surface polishing | Expired / Lapsed | 1965-04-29 | 1968-05-28 | 0 | Details |
| US3375418A | S-m-s device with partial semiconducting layers | Expired / Lapsed | 1964-09-15 | 1968-03-26 | 0 | Details |
| US3294583A | Process of coating a silicon semiconductor with indium usin… | Expired / Lapsed | 1962-06-14 | 1966-12-27 | 0 | Details |
| US3293587A | Electrical resistor and the like | Expired / Lapsed | 1965-10-20 | 1966-12-20 | 2 | Details |
| US3265945A | Packaged capacitor and method of making the same | Expired / Lapsed | 1964-10-27 | 1966-08-09 | 1 | Details |
| US3265955A | Apparatus for initiating conduction | Expired / Lapsed | 1962-07-13 | 1966-08-09 | 2 | Details |
| US3182376A | Silicon dioxide capacitor | Expired / Lapsed | 1963-02-21 | 1965-05-11 | 2 | Details |
| US3181097A | Single crystal semiconductor resistors | Expired / Lapsed | 1960-09-19 | 1965-04-27 | 1 | Details |
| US3167451A | Method of resistor production | Expired / Lapsed | 1959-08-26 | 1965-01-26 | 2 | Details |
| US3158746A | Light modulation in a semiconductor body | Expired / Lapsed | 1960-12-27 | 1964-11-24 | 2 | Details |
| US3154439A | Method for forming a protective skin for transistor | Expired / Lapsed | 1959-04-09 | 1964-10-27 | 0 | Details |
| US3128422A | Control circuit for unidirectional current conducting devic… | Expired / Lapsed | 1960-04-18 | 1964-04-07 | 1 | Details |
| US3100813A | Capacitor sealing means | Expired / Lapsed | 1959-01-12 | 1963-08-13 | 2 | Details |
| US3080481A | Method of making transistors | Expired / Lapsed | 1959-04-17 | 1963-03-05 | 1 | Details |
| US3073007A | Method and means for assembling capacitors | Expired / Lapsed | 1958-09-29 | 1963-01-15 | 2 | Details |
| US3066247A | Electrical capacitors | Expired / Lapsed | 1954-08-25 | 1962-11-27 | 2 | Details |
| US3029366A | Multiple semiconductor assembly | Expired / Lapsed | 1959-04-22 | 1962-04-10 | 0 | Details |
| US2993998A | Transistor combinations | Expired / Lapsed | 1955-06-09 | 1961-07-25 | 0 | Details |
| US2991371A | Variable capacitor | Expired / Lapsed | 1959-06-15 | 1961-07-04 | 0 | Details |
| US2980831A | Means for reducing surface recombination | Expired / Lapsed | 1957-11-21 | 1961-04-18 | 0 | Details |
| US2953759A | Semi-conductor resistors | Expired / Lapsed | 1953-07-01 | 1960-09-20 | 0 | Details |
| US2942110A | Batteryless radiation indicator | Expired / Lapsed | 1955-03-09 | 1960-06-21 | 0 | Details |
| US2935668A | Electrical capacitors | Expired / Lapsed | 1956-06-28 | 1960-05-03 | 2 | Details |
| US2929923A | Light modulation device | Expired / Lapsed | 1954-08-19 | 1960-03-22 | 0 | Details |
| US2919213A | Polytetrafluoroethylene suspensions and method of coating w… | Expired / Lapsed | 1956-05-31 | 1959-12-29 | 2 | Details |
| US2901634A | Remote monitoring amplification | Expired / Lapsed | 1955-02-16 | 1959-08-25 | 0 | Details |
| US2897409A | Plating process | Expired / Lapsed | 1954-10-06 | 1959-07-28 | 0 | Details |
| US2890976A | Monocrystalline tubular semiconductor | Expired / Lapsed | 1954-12-30 | 1959-06-16 | 1 | Details |
| US2883544A | Transistor manufacture | Expired / Lapsed | 1955-12-19 | 1959-04-21 | 0 | Details |
| US2874340A | Rectifying contact | Expired / Lapsed | 1953-06-26 | 1959-02-17 | 0 | Details |
| US2864774A | Process of producing electrically conductive plastic | Expired / Lapsed | 1953-04-29 | 1958-12-16 | 2 | Details |
| US2855334A | Method of preparing semiconducting crystals having symmetri… | Expired / Lapsed | 1955-08-17 | 1958-10-07 | 2 | Details |
| US2823149A | Process of forming barrier layers in crystalline bodies | Expired / Lapsed | 1953-10-27 | 1958-02-11 | 2 | Details |
| US2820131A | Curing oven | Expired / Lapsed | 1951-08-01 | 1958-01-14 | 0 | Details |
| US2806985A | Electrical capacitors | Expired / Lapsed | 1954-05-11 | 1957-09-17 | 0 | Details |
| US2795680A | Printed resistors and inks | Expired / Lapsed | 1952-05-16 | 1957-06-11 | 2 | Details |
| US2786925A | Metal film resistor | Expired / Lapsed | 1952-12-31 | 1957-03-26 | 1 | Details |
| US2786088A | Electrochemical systems | Expired / Lapsed | 1952-09-09 | 1957-03-19 | 2 | Details |
| US2785351A | Electrical capacitors | Expired / Lapsed | 1952-06-10 | 1957-03-12 | 0 | Details |
| US2779877A | Multiple junction transistor unit | Expired / Lapsed | 1955-06-17 | 1957-01-29 | 0 | Details |
| US2777976A | High voltage capacitor | Expired / Lapsed | 1955-05-24 | 1957-01-15 | 0 | Details |
| US2776235A | Electric circuit printing | Expired / Lapsed | 1952-09-18 | 1957-01-01 | 2 | Details |
| US2754259A | Process and apparatus for growing single crystals | Expired / Lapsed | 1952-11-29 | 1956-07-10 | 2 | Details |
| US2740732A | Process of bonding a metal film to a thermoplastic sheet an… | Expired / Lapsed | 1951-07-16 | 1956-04-03 | 2 | Details |
| US2738453A | Electrical condenser and method of making it | Expired / Lapsed | 1949-09-27 | 1956-03-13 | 2 | Details |
| US2707693A | Process for producing electrical coils | Expired / Lapsed | 1950-07-21 | 1955-05-03 | 2 | Details |
| US2707703A | Heat stable, insulated, electrical conductors and process f… | Expired / Lapsed | 1947-08-09 | 1955-05-03 | 1 | Details |
| US2694185A | Electrical circuit arrangement | Expired / Lapsed | 1951-01-19 | 1954-11-09 | 0 | Details |
| US2636164A | Fire alarm system | Expired / Lapsed | 1951-04-23 | 1953-04-21 | 0 | Details |
| US2635994A | Production of carbon resistors | Expired / Lapsed | 1950-04-27 | 1953-04-21 | 2 | Details |
| US2634315A | Electrical condenser | Expired / Lapsed | 1951-11-29 | 1953-04-07 | 0 | Details |
| US2628271A | Molded electrolytic capacitor | Expired / Lapsed | 1950-07-11 | 1953-02-10 | 2 | Details |
| US2623096A | Electrical capacitor | Expired / Lapsed | 1949-09-27 | 1952-12-23 | 2 | Details |
| US2622133A | Sealed electrical circuit components | Expired / Lapsed | 1950-05-01 | 1952-12-16 | 0 | Details |
| US2619443A | Method of making electrical condensers | Expired / Lapsed | 1948-04-08 | 1952-11-25 | 0 | Details |
| US2593922A | Insulated electrical conductor | Expired / Lapsed | 1947-04-16 | 1952-04-22 | 2 | Details |
| US2574458A | Remote monitoring system | Expired / Lapsed | 1947-06-27 | 1951-11-13 | 0 | Details |
| US2553362A | Electrical insulation | Expired / Lapsed | 1946-05-28 | 1951-05-15 | 0 | Details |
| US2540962A | Process for producing polytetrahaloethylene films | Expired / Lapsed | 1948-11-16 | 1951-02-06 | 2 | Details |
| US2539446A | Process for producing dielectric sheets | Expired / Lapsed | 1947-07-12 | 1951-01-30 | 2 | Details |
| US2526688A | Process of producing electrical condensers | Expired / Lapsed | 1946-12-28 | 1950-10-24 | 2 | Details |
| US2518225A | High-frequency resistor | Expired / Lapsed | 1946-07-03 | 1950-08-08 | 0 | Details |
| US2501616A | Soldering iron tip | Expired / Lapsed | 1947-04-08 | 1950-03-21 | 2 | Details |
| US2495630A | Electrically insulated conductor and process for producing … | Expired / Lapsed | 1944-05-20 | 1950-01-24 | 0 | Details |
| US2495199A | Electrical resistor and high-resistance carbon composition … | Expired / Lapsed | 1945-10-19 | 1950-01-17 | 0 | Details |
| US2444880A | Electrical seal | Expired / Lapsed | 1943-12-23 | 1948-07-06 | 0 | Details |
| US2421652A | Electrical conductor | Expired / Lapsed | 1943-08-02 | 1947-06-03 | 0 | Details |
| US2408910A | Electrical condenser | Expired / Lapsed | 1942-07-27 | 1946-10-08 | 0 | Details |
| US2406319A | Insulated electrical conductor | Expired / Lapsed | 1943-11-19 | 1946-08-27 | 0 | Details |
| US2386634A | Flexible electrical insulating layer | Expired / Lapsed | 1940-03-20 | 1945-10-09 | 0 | Details |