US2934084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly check valves
Assignee: Boeing Co
•
Filing: 1954-04-12
•
Granted: 1960-04-26
•
Expires: 1974-04-12
Abstract
No abstract record available.
Inventors
- 👤 Clarence R Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:35
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7901; Y10T137/7903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US156426A
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US345420A
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FR431370A
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US1161460A
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GB202126A
Cited
US1707942A
Cited
GB356974A
Cited
DE545879C
Cited
GB394221A
Cited
US2577657A
Cited
US2664264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |