US3207426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary-piston engine construction
Assignee: Daimler Benz AG
•
Filing: 1963-01-14
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Granted: 1965-09-21
•
Expires: 1983-01-14
Abstract
No abstract record available.
Inventors
- 👤 Gassmann Johannes
- 👤 Ehrhardt Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:59
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A RADIAL SEAL STRUCTURE FOR PISTONS IN ROTARY PISTON INTERNAL COMBUSTION ENGINES WHICH HAVE GROOVE MEANS EXTENDING SUBSTANTIALLY PARALLEL TO THE AXIS THEREOF, COMPRISING VANE-LIKE MEANS HAVING TOP, BOTTOM AND SIDE SURFACES, BOTH OF THE SIDE SURFACES OF SAID SEALING MEWANS BEING PROVIDED WITH RECESSES, SAID RECESSES EXTENDING AT LEAST NEARLY OVER THE ENTIRE DIMENSION OF THE SEALING MEANS IN THE AXIAL DIRECTION THEREOF AND TERMINATING INSIDE AT LEAST THE TOP SURFACE THEREBY LEAVING A RIB EXTENDING OVER THE ENTIRE LENGTH IN THE AXIAL DIRECTION OF THE SEALING MEANS WHICH EFFECTIVELY CONSTITUTES A SEAL FOR A RESPECTIVE RECESS IN THE RADIALLY OUTWARD DIRECTION, AND MEANS INCLUDING CROSS-BORE MEANS EXTENDING THROUGH SAID SEALING MEANS FOR EFFECTIVELY ESTABLISHING A COMMUNICATION BETWEEN THE RECESSES DISPOSED ON OPPOSITE SIDES OF SAID SEALING MEANS.
Claim 2
Dependent Claim
129 words
A RADIAL SEAL STRUCTURE FOR PISTONS IN ROTARY PISTON INTERNAL COMBUSTION ENGINES WHICH HAVE GROOVE MEANS EXTENDING SUBSTANTIALLY PARALLEL TO THE AXIS THEREOF, COMPRISING VANE-LIKE MEANS HAVING TOP, BOTTOM AND SIDE SURFACES, BOTH OF THE SIDE SURFACES OF SAID SEALING MEWANS BEING PROVIDED WITH RECESSES, SAID RECESSES EXTENDING AT LEAST NEARLY OVER THE ENTIRE DIMENSION OF THE SEALING MEANS IN THE AXIAL DIRECTION THEREOF AND TERMINATING INSIDE AT LEAST THE TOP SURFACE THEREBY LEAVING A RIB EXTENDING OVER THE ENTIRE LENGTH IN THE AXIAL DIRECTION OF THE SEALING MEANS WHICH EFFECTIVELY CONSTITUTES A SEAL FOR A RESPECTIVE RECESS IN THE RADIALLY OUTWARD DIRECTION, AND MEANS INCLUDING CROSS-BORE MEANS EXTENDING THROUGH SAID SEALING MEANS FOR EFFECTIVELY ESTABLISHING A COMMUNICATION BETWEEN THE RECESSES DISPOSED ON OPPOSITE SIDES OF SAID SEALING MEANS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |