US2905429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well casing mud valve with fluid and non-fluid actuating means
Assignee: Shaffer Tool Works
•
Filing: 1954-05-25
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Granted: 1959-09-22
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Expires: 1974-05-25
Abstract
No abstract record available.
Inventors
- 👤 Wilfred C Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:59
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/14; F16K31/143; E; E21; E21B; E21B21/00; E21B21/10; E21B21/106; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18592
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US740882A
Cited
US1836506A
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US2154955A
Cited
US2403427A
Cited
US2644485A
Cited
US2712429A
Cited
US2704947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-21 | 1963-03-23 | 1963-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-21 | 1967-03-23 | 1967-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-21 | 1971-03-23 | 1971-09-22 | $7700.00 | Window Closed / Lapsed |