| All Patents in class 123/81B |
Patents 1 -
10
of 10
      |
| Number | Date | Patentee | Title | Type |
| 69,232 | Sep. 24, 1867 | J. McConnell | Rotary Steam Valve | steam engine valves |
| 306,933 | Oct. 21, 1884 | S. Lawson | Gas Engine | gas and gasoline engines |
| 307,057 | Oct. 21, 1884 | S. Lawson | Gas Engine | gas and gasoline engines |
| 396,022 | Jan. 08, 1889 | J.C. Beckfeld | Gas Engine | gas and gasoline engines |
| 433,246 | Jul. 29, 1890 | S. Lawson | Valve for Gas Engines | internal combustion engine valves |
| 509,981 | Dec. 05, 1893 | C.B. Wattles | Gas Motor Engine | |
| 555,355 | Feb. 25, 1896 | A.A. Williams, C.W. Agerell | Gas Engine | gas and gasoline engines |
| 584,188 | Jun. 08, 1897 | S.D. McLelland, P.B. McLelland | Gas or Vapor Engine | |
| 873,963 | Dec. 17, 1907 | B.A. Slocum | Internal Combustion Engine | internal combustion engines |
| 1,112,842 | Oct. 06, 1914 | C.E. Sargent | Internal Combustion Engine | internal combustion engines |
