Specialties Development Corp
SpecialtieActive Patents
0
Total Holdings
51
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3339194A | Photosensitive intruder detecting system using alternately … | Expired / Lapsed | 1964-06-26 | 1967-08-29 | 2 | Details |
| US3321177A | Valve for fluid medium under pressure | Expired / Lapsed | 1964-08-06 | 1967-05-23 | 2 | Details |
| US3281817A | Intruder detection | Expired / Lapsed | 1964-07-02 | 1966-10-25 | 2 | Details |
| US3241269A | Inflatable buildings and like structures | Expired / Lapsed | 1963-11-19 | 1966-03-22 | 2 | Details |
| US3237183A | Watchman tour monitoring system | Expired / Lapsed | 1963-12-16 | 1966-02-22 | 2 | Details |
| US3179871A | Battery charging circuit | Expired / Lapsed | 1961-02-01 | 1965-04-20 | 2 | Details |
| US3176284A | System responsive to plural conditions with false indicatio… | Expired / Lapsed | 1963-09-27 | 1965-03-30 | 2 | Details |
| US3161742A | Magnetic intruder and fire deterctor | Expired / Lapsed | 1961-08-24 | 1964-12-15 | 0 | Details |
| US3118139A | Speed measuring apparatus | Expired / Lapsed | 1959-11-25 | 1964-01-14 | 2 | Details |
| US3111657A | Compensation for turbulence and other effects in intruder d… | Expired / Lapsed | 1960-03-16 | 1963-11-19 | 2 | Details |
| US3110088A | Method of making resistance elements | Expired / Lapsed | 1962-04-06 | 1963-11-12 | 2 | Details |
| US3076566A | Warehousing system | Expired / Lapsed | 1959-06-18 | 1963-02-05 | 2 | Details |
| US3067589A | Cooling apparatus | Expired / Lapsed | 1960-11-08 | 1962-12-11 | 0 | Details |
| US3068438A | Multiple resistance characteristic semi-conductor elements | Expired / Lapsed | 1960-02-17 | 1962-12-11 | 0 | Details |
| US3060417A | Condition responsive network insensitive to electrical leak… | Expired / Lapsed | 1959-01-20 | 1962-10-23 | 0 | Details |
| US3016506A | Semi-conductive element | Expired / Lapsed | 1960-02-01 | 1962-01-09 | 0 | Details |
| US3011718A | Control network for air conditioning units | Expired / Lapsed | 1958-12-17 | 1961-12-05 | 0 | Details |
| US2994859A | Flame detecting apparatus | Expired / Lapsed | 1956-06-15 | 1961-08-01 | 0 | Details |
| US2967252A | System for supplying controlled frequency power | Expired / Lapsed | 1958-08-04 | 1961-01-03 | 0 | Details |
| US2946990A | Apparatus for detecting flame | Expired / Lapsed | 1954-09-14 | 1960-07-26 | 0 | Details |
| FR1225255A | Electronic relay | Expired / Lapsed | 1959-05-22 | 1960-06-30 | 0 | Details |
| US2938704A | Seal for reciprocating valve | Expired / Lapsed | 1957-04-02 | 1960-05-31 | 0 | Details |
| US2901740A | Electrical network automatically responsive to a change in … | Expired / Lapsed | 1956-11-23 | 1959-08-25 | 0 | Details |
| US2871197A | Resistance material for fire detector element | Expired / Lapsed | 1954-10-26 | 1959-01-27 | 2 | Details |
| US2850684A | Self-resetting electrical network automatically responsive … | Expired / Lapsed | 1954-01-11 | 1958-09-02 | 0 | Details |
| US2837809A | Process of producing fabric containing kinky woolen pile | Expired / Lapsed | 1955-07-05 | 1958-06-10 | 0 | Details |
| US2792568A | Network for detecting the failure of the insulation of elec… | Expired / Lapsed | 1955-03-04 | 1957-05-14 | 0 | Details |
| US2790872A | Deformation switch assembly | Expired / Lapsed | 1953-12-02 | 1957-04-30 | 0 | Details |
| US2790873A | Deformation switch | Expired / Lapsed | 1953-05-08 | 1957-04-30 | 0 | Details |
| US2773602A | Filter apparatus | Expired / Lapsed | 1953-02-02 | 1956-12-11 | 0 | Details |
| US2728827A | Deformable switch | Expired / Lapsed | 1953-03-23 | 1955-12-27 | 0 | Details |
| US2717042A | Impact operated valve | Expired / Lapsed | 1950-03-31 | 1955-09-06 | 0 | Details |
| US2668284A | Apparatus for detecting suspended matter in fluids | Expired / Lapsed | 1950-02-28 | 1954-02-02 | 0 | Details |
| US2645266A | Reinforced rubber structure and method of treating nylon ya… | Expired / Lapsed | 1950-12-13 | 1953-07-14 | 2 | Details |
| US2644313A | Carbon dioxide storage | Expired / Lapsed | 1951-11-16 | 1953-07-07 | 0 | Details |
| US2644934A | Fluid sampling apparatus | Expired / Lapsed | 1948-01-02 | 1953-07-07 | 0 | Details |
| US2630018A | Plural selective position cam actuator for valves | Expired / Lapsed | 1949-11-09 | 1953-03-03 | 0 | Details |
| US2626361A | Apparatus for detecting suspended matter in fluids | Expired / Lapsed | 1950-09-22 | 1953-01-20 | 0 | Details |
| US2528515A | Siren | Expired / Lapsed | 1946-01-04 | 1950-11-07 | 0 | Details |
| US2489339A | Fluid pressure medium dispensing means | Expired / Lapsed | 1944-12-02 | 1949-11-29 | 0 | Details |
| US2485588A | Apparatus for visual detection of illuminated suspended mat… | Expired / Lapsed | 1944-12-23 | 1949-10-25 | 0 | Details |
| US2410763A | Vibration preventing syphon tube support | Expired / Lapsed | 1942-10-21 | 1946-11-05 | 0 | Details |
| US2404796A | Fluid pressure control device | Expired / Lapsed | 1942-10-01 | 1946-07-30 | 0 | Details |
| US2403436A | Inflation device | Expired / Lapsed | 1941-09-30 | 1946-07-09 | 0 | Details |
| US2363521A | Valve device | Expired / Lapsed | 1942-09-25 | 1944-11-28 | 0 | Details |
| US2353161A | Flotation apparatus | Expired / Lapsed | 1941-12-30 | 1944-07-11 | 0 | Details |
| US2351607A | Impact actuator | Expired / Lapsed | 1941-07-22 | 1944-06-20 | 0 | Details |
| US2351035A | Cutoff valve | Expired / Lapsed | 1942-08-29 | 1944-06-13 | 0 | Details |
| US2333100A | Control device | Expired / Lapsed | 1941-08-14 | 1943-11-02 | 0 | Details |
| US2317422A | Valve | Expired / Lapsed | 1941-12-31 | 1943-04-27 | 0 | Details |
| US2291617A | Fluid medium dispensing apparatus | Expired / Lapsed | 1939-12-29 | 1942-08-04 | 0 | Details |