US2970476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic pressure ratio apparatus
Assignee: B-I-F Ind Inc
•
Filing: 1956-06-19
•
Granted: 1961-02-07
•
Expires: 1976-06-19
Abstract
No abstract record available.
Inventors
- 👤 Francis H Cary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:12
CPC Classifications
F; F15; F15C; F15C4/00; F15C3/00; F15C3/10; F15C3/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2736199A
Cited
US2317293A
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US2394284A
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US2507498A
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US2487310A
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US2521477A
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 |