US2652200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barometric draft regulator
Assignee: Individual
•
Filing: 1950-09-29
•
Granted: 1953-09-15
•
Expires: 1970-09-29
Abstract
No abstract record available.
Inventors
- 👤 Edward A Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:35
CPC Classifications
F; F23; F23L; F23L13/00; F23L13/02; F23L11/00; F23L11/02; F23M; F23M9/00; F23M9/003; F23M9/006; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US184061A
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US2405770A
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US1266130A
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US1553848A
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US1783418A
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US2254505A
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US2346559A
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US2433749A
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US2460538A
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US2460960A
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US2487856A
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US2540191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |