US2970439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic igniter for ram-jet burner
Assignee: Individual
•
Filing: 1949-09-13
•
Granted: 1961-02-07
•
Expires: 1969-09-13
Abstract
No abstract record available.
Inventors
- 👤 Walter G Berl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:41
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/16; F23R3/18; F02; F02C; F02C7/00; F02C7/26; F02C7/264
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2407729A
Cited
US1502251A
Cited
GB271899A
Cited
US1753897A
Cited
US2168313A
Cited
US2385833A
Cited
US2433943A
Cited
US2505798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |