Patent US3664778A successfully refreshed from Google Patents.
US3664778A
Expired / Lapsed
US
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Rotary internal combustion engine and sealing means therefor
Assignee: Svenska Rotor Maskiner AB
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Filing: 1969-11-12
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Granted: 1972-05-23
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Expires: 1989-11-12
Abstract
Abstract ROTARY INTERNAL COMBUSTION ENGINE COMPRISING TWO INTERMESHING GROOVED ROTORS MOUNTED IN A STATIONARY HOUSING, PROVIDING CONTINUOUSLY SEALED INLET SLUICE CHAMBERS, OPERATION CHAMBERS, FOR COMPRESSION, COMBUSTION AND EXPANSION, AND OUTLET SLUICE CHAMBER, HAVING A SET OF SEALING ELEMENTS FOR POSITIVE SEALING OF EACH CHAMBER.
Inventors
- 👤 Hans Robert Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:12
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/08; F01C1/12; F01C1/14; F01C1/20; F01C19/00; F01C19/10
Claims Analysis
Total Claims: 0
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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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |