Patent US2937494A successfully refreshed from Google Patents.
US2937494A
Expired / Lapsed
US
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Series type multiple thermal jet propulsion system
Assignee: Individual
•
Filing: 1955-09-13
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Granted: 1960-05-24
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Expires: 1975-09-13
Abstract
No abstract record available.
Inventors
- 👤 Johnson Horace James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:51
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/10; F02K7/16; F02K7/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |