US2931615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Individual
•
Filing: 1954-10-11
•
Granted: 1960-04-05
•
Expires: 1974-10-11
Abstract
No abstract record available.
Inventors
- 👤 Rodney B Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:33
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/22; F16K3/24; F16K3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US870792A
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US2029837A
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US1995299A
Cited
US2059808A
Cited
US2152831A
Cited
US2331527A
Cited
US2526039A
Cited
US2651325A
Cited
US2672158A
Cited
US2708452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |