| All Patents in class 237/12.1 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 33,497 | Oct. 15, 1861 | P. Shaw | Air Engine | hot air engines |
| 100,211 | Feb. 22, 1870 | B.F. Sturtevant | Heating and Ventilating Apparatus | furnaces |
| 193,086 | Jul. 17, 1877 | B. Holly | Steam Apparatus | steam heating |
| 260,097 | Jun. 27, 1882 | B. Holly | Apparatus for Supplying Steam | steam heating |
| 529,452 | Nov. 20, 1894 | M. Lorois | Gas Motor | internal combustion engines |
| 575,720 | Jan. 26, 1897 | J. Ledent | Gas Engine | cooling apparatus |
| 2,189,895 | Feb. 13, 1940 | F.P. Grutzner | Heating and Ventilating System | cooling apparatus |
| 2,200,379 | May 14, 1940 | R.D. Williams | Utilization of Waste Engine Heat | exhaust mechanisms |
| 2,208,157 | Jul. 16, 1940 | F.P. Grutzner | System for Recovering and Utilizing Waste Heat | exhaust mechanisms |
| 2,256,303 | Sep. 16, 1941 | R.D. Williams | Recovery and Utilization of Waste Engine Heat | exhaust mechanisms |
| 2,266,193 | Dec. 16, 1941 | F.P. Grutzner | Heating System | exhaust mechanisms |
