Patent US2885176A successfully refreshed from Google Patents.
US2885176A
Expired / Lapsed
US
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Valve construction
Assignee: Walworth Co
•
Filing: 1953-02-24
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Granted: 1959-05-05
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Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 Austin U Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:12
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1667580A
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US2524951A
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US2431437A
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US2574054A
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US2621011A
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US2616653A
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US2713989A
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US2574851A
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US2676782A
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US2624542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |