Patent US2997889A successfully refreshed from Google Patents.
US2997889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermittent engine
Assignee: GT Schjeldahl Co
•
Filing: 1956-12-24
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Granted: 1961-08-29
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Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Gilmore T Schjeldahl
- 👤 Jay D Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:40
CPC Classifications
F; F16; F16H; F16H27/00; F16H27/04; F16H27/10; Y; Y10; Y10T; Y10T74/00; Y10T74/14; Y10T74/15; Y10T74/1503; Y10T74/1524
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1909831A
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US1993413A
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US2636138A
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US2471505A
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US2639796A
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US2818150A
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US2897679A
Cited
US2886155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |