Patent US2950728A successfully refreshed from Google Patents.
US2950728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flapper valve
Assignee: Honeywell Inc
•
Filing: 1954-12-03
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Granted: 1960-08-30
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Expires: 1974-12-03
Abstract
No abstract record available.
Inventors
- 👤 Robert B Watrous
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:09
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/16; G05D16/163; F; F15; F15B; F15B5/00; F15B5/003; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/38; Y; Y10; Y10T; Y10T137/00; Y10T137/2278
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB216538A
Cited
US2140947A
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US2268783A
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US2454946A
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US2667886A
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CH276755A
Cited
US2638911A
Cited
US2688334A
Cited
US2717516A
Cited
US2672151A
Cited
US2718878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |