US3174432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion engine for conveying a hydraulic pressure medium
Assignee: Individual
•
Filing: 1961-08-01
•
Granted: 1965-03-23
•
Expires: 1981-08-01
Abstract
No abstract record available.
Inventors
- 👤 Eickmann Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:18
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F02B71/045; F04; F04B; F04B17/00; F04B17/05; F04B5/00; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A FREE PISTON ENGINE COMPRISING A MAIN CYLINDER; A MAIN PISTON RECIPROCABLY MOUNTED IN SAID MAIN CYLINDER AND DEFINING WITH THE SAME A FIRST CHAMBER AND A SECOND CHAMBER, SAID MAIN PISTON HAVING A PISTON ROD PROJECTING OUT OF SAID MAIN CYLINDER; MEANS FOR PRODUCING COMBUSTION IN AT LEAST SAID FIRST CHAMBER WHEREBY SAID MAIN PISTON IS DRIVEN IN ONE DIRECTION IN AN EXPANSION STROKE; SAID PISTON ROD HAVING OUTSIDE OF SAID MAIN CYLINDER AN INTERMEDIATE PORTION, AND AN END PORTION FORMED AS AN AUXILIARY PISTON; PUMP MEANS CONNECTED TO AND DRIVEN BY SAID INTERMEDIATE PORTION; AN AUXILIARY CYLINDER RECEIVING SAID AUXILIARY PISTON; A SECONDARY PUMP HAVING A RECIPROCABLE MEMBER AND COMMUNICATING WITH SAID AUXILIARY CYLINDER FOR SUPPLYING AND EXHAUSTING PRESSURE FLUID DURING RECIPROCATION OF SAID RECIPROCABLE MEMBER; AND ROTARY CAM MEANS FOR RECIPROCATING SAID RECIPROCABLE MEMBER IN
Claim 2
Dependent Claim
138 words
A FREE PISTON ENGINE COMPRISING A MAIN CYLINDER; A MAIN PISTON RECIPROCABLY MOUNTED IN SAID MAIN CYLINDER AND DEFINING WITH THE SAME A FIRST CHAMBER AND A SECOND CHAMBER, SAID MAIN PISTON HAVING A PISTON ROD PROJECTING OUT OF SAID MAIN CYLINDER; MEANS FOR PRODUCING COMBUSTION IN AT LEAST SAID FIRST CHAMBER WHEREBY SAID MAIN PISTON IS DRIVEN IN ONE DIRECTION IN AN EXPANSION STROKE; SAID PISTON ROD HAVING OUTSIDE OF SAID MAIN CYLINDER AN INTERMEDIATE PORTION, AND AN END PORTION FORMED AS AN AUXILIARY PISTON; PUMP MEANS CONNECTED TO AND DRIVEN BY SAID INTERMEDIATE PORTION; AN AUXILIARY CYLINDER RECEIVING SAID AUXILIARY PISTON; A SECONDARY PUMP HAVING A RECIPROCABLE MEMBER AND COMMUNICATING WITH SAID AUXILIARY CYLINDER FOR SUPPLYING AND EXHAUSTING PRESSURE FLUID DURING RECIPROCATION OF SAID RECIPROCABLE MEMBER; AND ROTARY CAM MEANS FOR RECIPROCATING SAID RECIPROCABLE MEMBER IN
References Cited (Backward Citations)
US1349394A
Cited
US2306131A
Cited
US2391972A
Cited
US2666569A
Cited
US2661592A
Cited
US2872778A
Cited
US2820415A
Cited
US2882685A
Cited
US2978986A
Cited
US2946287A
Cited
US2991773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |