US3477507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well safety valve
Assignee: Cook Testing Co
•
Filing: 1967-06-13
•
Granted: 1969-11-11
•
Expires: 1987-06-13
Abstract
No abstract record available.
Inventors
- 👤 John S Page Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:20
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1669; Y10T137/1677; Y10T137/7722; Y10T137/7723; Y10T137/7731; Y10T137/7733; Y10T137/7754; Y10T137/7781; Y10T137/7835; Y10T137/7836
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1741489A
Cited
US1178422A
Cited
US2298150A
Cited
US2890859A
Cited
US3252476A
Cited
US3389718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |