US2598099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for installing drilling equipment
Assignee: Shell Development Co
•
Filing: 1948-03-15
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Granted: 1952-05-27
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Expires: 1968-03-15
Abstract
No abstract record available.
Inventors
- 👤 William F Bates
- 👤 James N Gregory
- 👤 Alfred H Curry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:16
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04; E21B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |