| US Patent: 625,387 
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| Valveless two-Cycle Hydrocarbon Engine | 
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| Patentee: |  |
 | Fritz Dürr (exact or similar names) - Berlin, Prussia, Germany |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Apr. 15, 1898 |  
| Granted: | May 23, 1899 |  USPTO (New site tip)
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                        Joel Havens
 
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| Description: |  | Claim:
 My invention relates to a two-cycle or two- phase hydrocarbon-motor for petroleum, gas, benzine, &c., which is adapted to work without constituent valve parts, so that an absolutely reliable and steady action can be guaranteed. |  |