Herman Nelson Co
Herman NelActive Patents
0
Total Holdings
7
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2327663A | Heating and ventilating apparatus | Expired / Lapsed | 1940-12-06 | 1943-08-24 | 0 | Details |
| US2327664A | Method of and apparatus for air conditioning | Expired / Lapsed | 1940-12-06 | 1943-08-24 | 0 | Details |
| US2229304A | Air conditioning apparatus | Expired / Lapsed | 1938-01-12 | 1941-01-21 | 0 | Details |
| US2023447A | Method and mechanism of heating and ventilating | Expired / Lapsed | 1933-06-22 | 1935-12-10 | 0 | Details |
| US1871225A | Heating and ventilating unit | Expired / Lapsed | 1930-11-17 | 1932-08-09 | 0 | Details |
| US1753157A | Heating and ventilating apparatus | Expired / Lapsed | 1929-02-04 | 1930-04-01 | 0 | Details |
| US1459927A | Fan | Expired / Lapsed | 1921-05-09 | 1923-06-26 | 0 | Details |