| US Patent: 634,063 
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| Gas Motor | 
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| Patentees: |  
 | Charles J. F. Mollet-Fontaine (exact or similar names) - Lille, Hauts-de-France, France |  | Léon A. C. Letombe (exact or similar names) - Lille, Hauts-de-France, France |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Nov. 15, 1897 |  
| Granted: | Oct. 03, 1899 |  USPTO (New site tip)
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                        Joel Havens
 
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| Description: |  | Claim:
In combination in a gas-engine with the cylinder and piston, a gas-valve and an air-valve, with controlling means for said valves arranged substantially as described upon reduction of the load of the engine to increase the supply of air while reducing that of the gas. |  |