US3498375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well derrick substructure with blowout preventer dolly
Assignee: Lee C Moore Corp
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Filing: 1968-01-04
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Granted: 1970-03-03
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Expires: 1988-01-04
Abstract
No abstract record available.
Inventors
- 👤 John D Mcewen
- 👤 Robert B Donnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:50
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064; E21B15/00; E21B15/02; E21B3/00; E21B3/02; E21B3/04; E21B3/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE26290E
Cited
US3001593A
Cited
US2981346A
Cited
US3043255A
Cited
US3023808A
Cited
US3189093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |