Ward Leonard Electric Co
Ward LeonaActive Patents
0
Total Holdings
24
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2943170A | Electrical contact mounting | Expired / Lapsed | 1958-02-21 | 1960-06-28 | 0 | Details |
| US2693558A | Electric follow-up motor control apparatus | Expired / Lapsed | 1951-04-03 | 1954-11-02 | 0 | Details |
| US2635223A | Voltage regulator | Expired / Lapsed | 1950-10-31 | 1953-04-14 | 0 | Details |
| US2491965A | Electric resistive device | Expired / Lapsed | 1946-06-13 | 1949-12-20 | 0 | Details |
| US2453470A | Electric controlling apparatus | Expired / Lapsed | 1945-12-07 | 1948-11-09 | 0 | Details |
| US2424776A | Shockproof electromagnetic device | Expired / Lapsed | 1942-06-09 | 1947-07-29 | 0 | Details |
| US2396851A | Electric controlling apparatus | Expired / Lapsed | 1943-04-02 | 1946-03-19 | 0 | Details |
| US2360954A | Antichattering electromagnetic control | Expired / Lapsed | 1942-03-14 | 1944-10-24 | 0 | Details |
| US2353406A | Device for overcoming effects of shocks | Expired / Lapsed | 1942-02-25 | 1944-07-11 | 0 | Details |
| US2299911A | Motor starting apparatus | Expired / Lapsed | 1939-08-16 | 1942-10-27 | 0 | Details |
| US2259647A | Electric controlling apparatus | Expired / Lapsed | 1939-02-09 | 1941-10-21 | 0 | Details |
| US2078880A | Electric controlling apparatus | Expired / Lapsed | 1935-02-09 | 1937-04-27 | 0 | Details |
| US2020289A | Resistance unit | Expired / Lapsed | 1933-05-17 | 1935-11-12 | 0 | Details |
| US2003945A | Electric controlling apparatus | Expired / Lapsed | 1931-09-05 | 1935-06-04 | 0 | Details |
| US1986112A | Electric controlling apparatus | Expired / Lapsed | 1933-05-11 | 1935-01-01 | 0 | Details |
| US1981921A | Electric controlling apparatus | Expired / Lapsed | 1932-08-10 | 1934-11-27 | 0 | Details |
| US1982007A | Electric controlling apparatus | Expired / Lapsed | 1931-09-11 | 1934-11-27 | 0 | Details |
| US1963093A | Electric controlling apparatus | Expired / Lapsed | 1931-09-10 | 1934-06-19 | 0 | Details |
| US1932923A | Resistance device | Expired / Lapsed | 1930-11-15 | 1933-10-31 | 0 | Details |
| US1893223A | Electric controlling apparatus | Expired / Lapsed | 1930-12-24 | 1933-01-03 | 0 | Details |
| US1834416A | Electric controlling apparatus | Expired / Lapsed | 1928-03-20 | 1931-12-01 | 0 | Details |
| US1830232A | Electric controlling apparatus | Expired / Lapsed | 1929-11-04 | 1931-11-03 | 0 | Details |
| US1828900A | Electric controlling apparatus | Expired / Lapsed | 1929-10-26 | 1931-10-27 | 0 | Details |
| US1813409A | Alternating current controlling apparatus | Expired / Lapsed | 1928-11-21 | 1931-07-07 | 0 | Details |