US2390601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowout seal for well drilling rotaries
Assignee: Oil Well Supply Co
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Filing: 1943-08-26
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Granted: 1945-12-11
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Expires: 1963-08-26
Abstract
No abstract record available.
Inventors
- 👤 August R Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; E21B33/085; E21B3/00; E21B3/02; E21B3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-12-10 | 1949-06-11 | 1949-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-10 | 1953-06-11 | 1953-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-10 | 1957-06-11 | 1957-12-11 | $7700.00 | Window Closed / Lapsed |