Patent US3204614A successfully refreshed from Google Patents.
US3204614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary-piston internal combustion engine
Assignee: Daimler Benz AG
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Filing: 1961-08-30
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Granted: 1965-09-07
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Expires: 1981-08-30
Abstract
No abstract record available.
Inventors
- 👤 Huber Reinhold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:30
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/02; F02B55/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A POLYGONAL LIQUID-COOLED PISTON HAVING A PLURALITY OF CORNERS, COMPRISING OUTER PISTON WALL MEANS, FURTHER WALL MEANS WITHIN SAID PISTON DISPOSED SUBSTANTIALLY PARALLEL TO AND AT A RELATIVELY SMALL DISTANCE WITH RESPECT TO SAID OUTER PISTON WALL MEANS, SAID TWO WALL MEANS FORMING THEREBETWEEN A SPACER FOR RECEIVING THE COOLING LIQUID WHICH EXTENDS OVER A SUBSTANTIAL PORTION OF THE WIDTH OF THE PISTSON IN THE AXIAL DIRECTION THEREOF, MEANS FOR SUPPLYING COOLDING LIQUID TO SAID SPACE SUBSTANTIALLY IN RADIAL DIRECTIONS AT SAID PLURALITY OF CORNERS, AND MEANS ENABLING THE DISCHARGE OF SAID COOLING LIQUID FROM SAID SPACE AT A PLURALITY OF PLACES INTERMEDIATE NEIGHBORING CORNERS.
Claim 2
Dependent Claim
105 words
A POLYGONAL LIQUID-COOLED PISTON HAVING A PLURALITY OF CORNERS, COMPRISING OUTER PISTON WALL MEANS, FURTHER WALL MEANS WITHIN SAID PISTON DISPOSED SUBSTANTIALLY PARALLEL TO AND AT A RELATIVELY SMALL DISTANCE WITH RESPECT TO SAID OUTER PISTON WALL MEANS, SAID TWO WALL MEANS FORMING THEREBETWEEN A SPACER FOR RECEIVING THE COOLING LIQUID WHICH EXTENDS OVER A SUBSTANTIAL PORTION OF THE WIDTH OF THE PISTSON IN THE AXIAL DIRECTION THEREOF, MEANS FOR SUPPLYING COOLDING LIQUID TO SAID SPACE SUBSTANTIALLY IN RADIAL DIRECTIONS AT SAID PLURALITY OF CORNERS, AND MEANS ENABLING THE DISCHARGE OF SAID COOLING LIQUID FROM SAID SPACE AT A PLURALITY OF PLACES INTERMEDIATE NEIGHBORING CORNERS.
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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) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |