Patent US3270720A successfully refreshed from Google Patents.
US3270720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston internal combustion engine
Assignee: Daimler Benz AG
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Filing: 1964-03-02
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Granted: 1966-09-06
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Expires: 1984-03-02
Abstract
No abstract record available.
Inventors
- 👤 Ehrhardt Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:35
CPC Classifications
F; F02; F02B; F02B53/00; F02B2053/005; F02B2730/00; F02B2730/01; F02B2730/018; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN A ROTARY PISTON INTERNAL COMBUSTION ENGINE OF TROCHOIDAL CONSTRUCTION HAVING AN ENVELOPE PROVIDED WITH AN INTERNAL CAM SURFACE WHICH TOGETHER WITH THE LATERAL PARTS THEREOF DEFINES AN INTERIOR SPACE THROUGH WHICH EXTENDS AN ECCENTRIC SHAFT ON THE ECCENTRIC OF WHICH IS ROTATABLY SUPPORTED A POLYGONAL PISTON THE ROTATIONAL SPEED OF WHICH HELD AT PREDETERMINED RATIO TO THE ROTATIONAL
Claim 2
Dependent Claim
59 words
IN A ROTARY PISTON INTERNAL COMBUSTION ENGINE OF TROCHOIDAL CONSTRUCTION HAVING AN ENVELOPE PROVIDED WITH AN INTERNAL CAM SURFACE WHICH TOGETHER WITH THE LATERAL PARTS THEREOF DEFINES AN INTERIOR SPACE THROUGH WHICH EXTENDS AN ECCENTRIC SHAFT ON THE ECCENTRIC OF WHICH IS ROTATABLY SUPPORTED A POLYGONAL PISTON THE ROTATIONAL SPEED OF WHICH HELD AT PREDETERMINED RATIO TO THE ROTATIONAL
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |