US2966900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Port-controlled two-stroke internal combustion engines
Assignee: Bristol Siddeley Engines Ltd
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Filing: 1957-07-25
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Granted: 1961-01-03
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Expires: 1977-07-25
Abstract
No abstract record available.
Inventors
- 👤 Ehrlich Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:42
CPC Classifications
F; F02; F02B; F02B25/00; F02B25/20; F02B2720/00; F02B2720/13; F02B2720/136
Claims Analysis
Total Claims: 0
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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) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |