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US3304923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine
Assignee: Individual
•
Filing: 1964-09-02
•
Granted: 1967-02-21
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Expires: 1984-09-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Parenti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:11
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/28; F02B75/16; F02B75/18; F02B75/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
AN ENGINE COMPRISING TWO PAIRS OF CYLINDERS WITH PISTONS MOUNTED TO RECIPROCATE THEREIN, (A) A CYLINDER OF EACH PAIR COMMUNICATING WITH A COMBUSTION CHAMBER HAVING A SINGLE HEAD, (B) SAID CYLINDERS HAVING DISCHARGE OPENINGS THEREIN FOR EXHAUST GASES WHICH ARE UNCOVERED BY PISTONS UPON COMPLETION OF THEIR POWER STROKES, (C) MEANS FOR FORCING AIR INTO SAID COMPRESSION CHAMBER FOR PASSAGE THROUGH BOTH CYLINDERS WHEN SAID PISTONS ARE AT THE ENDS OF THEIR POWER STROKES TO PURGE BURNT GASES THEREFROM, (D) DRIVE ARMS OSCILLATABLE ABOUT A COMMON AXIS AND TO WHICH THE PISTONS OF EACH PAIR ARE CONNECTED, (E) EACH PISTON OF A PAIR THROUGH ITS POWER STROKE MOVING THE OTHER PISTON OF ITS PAIR THROUGH ITS COMPRESSION STROKE, (F) AND MEANS FOR TRANSMITTING THE POWER FROM SAID DRIVE ARMS TO A COMMON SHAFT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |