US2889157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for connecting drill steels with a source of fluid under pressure
Assignee: DONALD GRANTHAM
•
Filing: 1955-05-18
•
Granted: 1959-06-02
•
Expires: 1975-05-18
Abstract
No abstract record available.
Inventors
- 👤 Rowena C Gibbons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:09
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86292
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2499659A
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DE806598C
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US2628850A
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US2687905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |