US2949930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve
Assignee: Camco Inc
•
Filing: 1958-06-30
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Granted: 1960-08-23
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Expires: 1978-06-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard H Moore
- 👤 William H Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:45
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7866; Y10T137/7867; Y10T137/7868; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913; Y10T137/7914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2202123A
Cited
US2495880A
Cited
US2603951A
Cited
US2571497A
Cited
FR1031887A
Cited
US2771091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |