US2874540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: RTX Corp
•
Filing: 1955-12-08
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Granted: 1959-02-24
•
Expires: 1975-12-08
Abstract
No abstract record available.
Inventors
- 👤 Edward F Esmeier
- 👤 Bertrand H Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:26
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB495544A
Cited
US2531761A
Cited
US2656675A
Cited
US2665674A
Cited
GB735874A
Cited
FR1093874A
Cited
US2806351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |