US2997847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion engines for rockets and aeroplanes
Assignee: Individual
•
Filing: 1957-12-20
•
Granted: 1961-08-29
•
Expires: 1977-12-20
Abstract
No abstract record available.
Inventors
- 👤 Hollingsworth R Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:02
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/04; F02C6/00; F02C6/20
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) | 1964-08-28 | 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 |