US2638169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protector for oil well equipment
Assignee: Vetco Gray LLC
•
Filing: 1947-02-11
•
Granted: 1953-05-12
•
Expires: 1967-02-11
Abstract
No abstract record available.
Inventors
- 👤 Robert L Crain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:17
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/02; E21B33/00; E21B33/02; E21B33/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1569247A
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US1517504A
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US1586923A
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US1651537A
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US1810431A
Cited
US1835891A
Cited
US2052939A
Cited
US2150887A
Cited
US2103586A
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US2148327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |