Patent US3460638A successfully refreshed from Google Patents.
US3460638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raise drilling apparatus
Assignee: Hughes Tool Co
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Filing: 1966-10-10
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Granted: 1969-08-12
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Expires: 1986-10-10
Abstract
No abstract record available.
Inventors
- 👤 Stuart C Millsapps Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:11
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1969513A
Cited
US2721725A
Cited
US2979320A
Cited
US3145786A
Cited
US3057416A
Cited
US3220494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |