Patent US2835109A successfully refreshed from Google Patents.
US2835109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Igniter for ram-jet
Assignee: Individual
•
Filing: 1952-07-17
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Granted: 1958-05-20
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Expires: 1972-07-17
Abstract
No abstract record available.
Inventors
- 👤 John P Longwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:09
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/16; F23R3/18; F02; F02C; F02C7/00; F02C7/26; F02C7/264; F02C7/266; F02K; F02K7/00; F02K7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB599257A
Cited
US2540594A
Cited
US2520388A
Cited
US2648196A
Cited
FR981045A
Cited
US2508420A
Cited
US2659195A
Cited
US2632300A
Cited
US2572723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |