US2197148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backfire door
Assignee: RTX Corp
•
Filing: 1937-06-03
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Granted: 1940-04-16
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Expires: 1957-06-03
Abstract
No abstract record available.
Inventors
- 👤 John S Hasbrouck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:24
CPC Classifications
F; F16; F16K; F16K39/00; F16K39/02; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/222; F02M; F02M1/00; F16K17/00; F16K17/02; F16K17/04; F16K17/0433; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4392; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/785; Y10T137/7851; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7932
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-04-16 | 1943-10-16 | 1944-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-16 | 1947-10-16 | 1948-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-16 | 1951-10-16 | 1952-04-16 | $7700.00 | Window Closed / Lapsed |