US3508577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowout control valve for drilling well
Assignee: Pan American Petroleum Corp
•
Filing: 1967-04-05
•
Granted: 1970-04-28
•
Expires: 1987-04-05
Abstract
No abstract record available.
Inventors
- 👤 Renic P Vincent
- 👤 Billy V Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08; E21B21/10; E21B21/106; Y; Y10; Y10T; Y10T137/00; Y10T137/6198; Y10T137/6253; Y10T137/7722; Y10T137/7837; Y10T137/7904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2084397A
Cited
US2731031A
Cited
US2741262A
Cited
US2716421A
Cited
US3243156A
Cited
US3429385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |