C A DUNHAM Co
C A DUNHAMActive Patents
0
Total Holdings
7
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2362977A | Resistance type temperature controlling and indicating syst… | Expired / Lapsed | 1938-10-24 | 1944-11-21 | 0 | Details |
| US2205716A | Unit heater and air conditioner | Expired / Lapsed | 1938-02-04 | 1940-06-25 | 0 | Details |
| US2075487A | Effective temperature thermostat | Expired / Lapsed | 1935-03-09 | 1937-03-30 | 0 | Details |
| US1986429A | Piston type discharge valve | Expired / Lapsed | 1932-06-13 | 1935-01-01 | 0 | Details |
| US1921172A | Average temperature control mechanism for heating systems | Expired / Lapsed | 1932-01-08 | 1933-08-08 | 0 | Details |
| US1893883A | Exhausting mechanism | Expired / Lapsed | 1931-05-15 | 1933-01-10 | 0 | Details |
| US1661323A | Method and apparatus for setting thermostats | Expired / Lapsed | 1925-09-30 | 1928-03-06 | 0 | Details |