US3092958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free piston engine
Assignee: Individual
•
Filing: 1961-09-11
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Granted: 1963-06-11
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Duncan Andrew William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:48
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A FREE PISTON ENGINE INCLUDING A CYLINDER HAVING A PLURALITY OF SPACED APART EXHAUST PORTS THEREIN AND MEANS FOR THE ADMISSION THERETO OF AIR AND FUEL; A PLURALITY OF PISTONS OPERABLE WITHIN SAID CYLINDER AND PISTON RODS EXTENDING OUTWARDLY FROM SAID PISTONS, SAID PISTONS RECIPROCATING WITHIN SAID CYLINDER COMPRESSING SAID FUEL AND AIR AT OPPOSITE ENDS OF SAID CYLINDER TO THE POINT OF COMPRESSION IGNITION AND MOVING INWARDLY OF SAID CYLINDER TO COMPRESS A FURTHER QUANTITY OF SAID FUEL AND AIR MIXTURE THEREBETWEEN AT SUBSTANTIALLY THE THE CENTER OF SAID CYLINDER TO A POINT OF COMPRESSION INGITION; AND SAID EXHAUST PORTS PERMITTING BURNED GASES FROM SAID ENDS OF SAID CYLINDER TO EVACUATE SAID CYLINDER DURING THE COMPRESSION OF SAID FUEL AND AIR MIXTURE IN THE CENTER OF SAID CYLINDER, AND SAID EXHAUST PORTS PERMITTING EVACUATION OF BURNED GASES FROM TLHE CENTER OF SAID CYLINDER UPON SAID PISTONS COMPRESSING SAID FUEL AND AIR MIXTURE AT SAID ENDS OF SAID CYLINDER.
Claim 2
Dependent Claim
159 words
A FREE PISTON ENGINE INCLUDING A CYLINDER HAVING A PLURALITY OF SPACED APART EXHAUST PORTS THEREIN AND MEANS FOR THE ADMISSION THERETO OF AIR AND FUEL; A PLURALITY OF PISTONS OPERABLE WITHIN SAID CYLINDER AND PISTON RODS EXTENDING OUTWARDLY FROM SAID PISTONS, SAID PISTONS RECIPROCATING WITHIN SAID CYLINDER COMPRESSING SAID FUEL AND AIR AT OPPOSITE ENDS OF SAID CYLINDER TO THE POINT OF COMPRESSION IGNITION AND MOVING INWARDLY OF SAID CYLINDER TO COMPRESS A FURTHER QUANTITY OF SAID FUEL AND AIR MIXTURE THEREBETWEEN AT SUBSTANTIALLY THE THE CENTER OF SAID CYLINDER TO A POINT OF COMPRESSION INGITION; AND SAID EXHAUST PORTS PERMITTING BURNED GASES FROM SAID ENDS OF SAID CYLINDER TO EVACUATE SAID CYLINDER DURING THE COMPRESSION OF SAID FUEL AND AIR MIXTURE IN THE CENTER OF SAID CYLINDER, AND SAID EXHAUST PORTS PERMITTING EVACUATION OF BURNED GASES FROM TLHE CENTER OF SAID CYLINDER UPON SAID PISTONS COMPRESSING SAID FUEL AND AIR MIXTURE AT SAID ENDS OF SAID CYLINDER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |