Federal Telegraph Co
Federal TeActive Patents
0
Total Holdings
24
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2411565A | Low impedance oscillator | Expired / Lapsed | 1942-07-20 | 1946-11-26 | 0 | Details |
| US2235804A | Automatic signal responsive device | Expired / Lapsed | 1937-03-23 | 1941-03-18 | 0 | Details |
| US2025218A | Remote control apparatus for radioreceivers | Expired / Lapsed | 1929-09-26 | 1935-12-24 | 0 | Details |
| US2002353A | Remote control device | Expired / Lapsed | 1932-02-27 | 1935-05-21 | 0 | Details |
| US1934099A | Electromagnetic sound reproducer | Expired / Lapsed | 1927-07-30 | 1933-11-07 | 0 | Details |
| US1898792A | Radioreceiver | Expired / Lapsed | 1929-10-26 | 1933-02-21 | 0 | Details |
| US1895111A | Signaling system | Expired / Lapsed | 1927-03-30 | 1933-01-24 | 0 | Details |
| US1834330A | Facsimile transmission system and method | Expired / Lapsed | 1928-05-14 | 1931-12-01 | 0 | Details |
| US1830328A | Cast piezo-electric device | Expired / Lapsed | 1926-12-20 | 1931-11-03 | 0 | Details |
| US1822929A | Filter circuit | Expired / Lapsed | 1927-05-12 | 1931-09-15 | 0 | Details |
| US1822928A | Piezo electric plate | Expired / Lapsed | 1925-09-30 | 1931-09-15 | 0 | Details |
| US1822618A | High power rectifier system | Expired / Lapsed | 1927-11-07 | 1931-09-08 | 0 | Details |
| US1810539A | Method of and apparatus for amplifying weak electric curren… | Expired / Lapsed | 1926-08-16 | 1931-06-16 | 0 | Details |
| US1807919A | Radio compass | Expired / Lapsed | 1925-06-06 | 1931-06-02 | 0 | Details |
| US1792746A | Radio transmission system | Expired / Lapsed | 1926-11-27 | 1931-02-17 | 0 | Details |
| US1766049A | High-frequency contact device | Expired / Lapsed | 1929-03-09 | 1930-06-24 | 0 | Details |
| US1766037A | Piezo-electric crystal apparatus | Expired / Lapsed | 1927-03-25 | 1930-06-24 | 0 | Details |
| US1766045A | Piezo-electric crystal modulation | Expired / Lapsed | 1927-01-25 | 1930-06-24 | 0 | Details |
| US1766042A | Composite piezo-electric crystal device | Expired / Lapsed | 1926-12-20 | 1930-06-24 | 0 | Details |
| US1767117A | Radio compass compensator | Expired / Lapsed | 1925-06-01 | 1930-06-24 | 0 | Details |
| US1753308A | Radio receiving system | Expired / Lapsed | 1925-10-02 | 1930-04-08 | 0 | Details |
| US1743039A | Electrical tuning system | Expired / Lapsed | 1927-02-28 | 1930-01-07 | 0 | Details |
| US1637864A | Electron-tube apparatus | Expired / Lapsed | 1926-05-25 | 1927-08-02 | 0 | Details |
| US1214283A | Wireless telegraphy. | Expired / Lapsed | 1912-09-24 | 1917-01-30 | 0 | Details |