Class F01B : MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
Subclass 7/04: Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (in opposite arrangement relative to main shaft F01B 1/08) with oppositely reciprocating pistons acting on same main shaft
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 11060450 | Cam-driven radial rotary engine incorporating an HCCI apparatus | Feb 11, 20 | Jul 13, 21 | Not available |
| 10962350 | Systems and methods for measurement of piston-to-piston clearances in multi-cylinder opposed piston engines | Dec 03, 18 | Mar 30, 21 | Cummins Inc. |
| 10458323 | Internal combustion engines | Dec 21, 12 | Oct 29, 19 | COX POWERTRAIN LIMITED |
| 9874141 | Internal combustion engines | Oct 16, 14 | Jan 23, 18 | COX POWERTRAIN LTD. |
| 9822773 | Durable canted off-axis driver for quiet pneumatic pumping | Jul 10, 15 | Nov 21, 17 | NEXTERN INC. |
| 9388695 | Engine with a variable volume chamber | Mar 17, 09 | Jul 12, 16 | Not available |
| 9103333 | Axial piston machines | Oct 25, 11 | Aug 11, 15 | Duke Engines Limited |
| 8904918 | Hybrid type air-compressor including combination of eccentric shaft and cross-slider mechanism | Mar 09, 11 | Dec 09, 14 | OXUS CO., LTD., INDUSTRY-UNIVERSITY COOPERATION FOUNDATION SOGANG UNIVERSITY, |
| 8826800 | Reciprocating piston mechanism with extended piston offset | Feb 17, 11 | Sep 09, 14 | Not available |
| 8646376 | Double rack and pinion oscillating device | Sep 03, 09 | Feb 11, 14 | SMC CORPORATION |
| 6314862 | Combination cylinder and pistons | Jan 24, 00 | Nov 13, 01 | CLARIDON TOOL AND DIE, INC., Retterer Manufacturing Co., Inc., |
| 5184537 | Clamp device drive apparatus | Mar 27, 92 | Feb 09, 93 | PASCAL CORPORATION |
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