Patent US3384057A successfully refreshed from Google Patents.
US3384057A
Expired / Lapsed
US
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Opposed piston engine
Assignee: HENRY S BOONE
•
Filing: 1966-12-29
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Granted: 1968-05-21
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Expires: 1986-12-29
Abstract
No abstract record available.
Inventors
- 👤 Henry S Boone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:42
CPC Classifications
F; F01; F01B; F01B1/00; F01B1/08; F01B9/00; F01B9/02; F01B9/04; F01B9/047; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18144
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2381465A
Cited
US2823653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |