Patent US3464505A successfully refreshed from Google Patents.
US3464505A
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US
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Drilling apparatus
Assignee: Pan American Petroleum Corp
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Filing: 1967-11-01
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Granted: 1969-09-02
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Expires: 1987-11-01
Abstract
No abstract record available.
Inventors
- 👤 Renic Price Vincent
- 👤 Lawrence B Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:32
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2774334A
Cited
US3167136A
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US3154153A
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US3198264A
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US3387671A
Cited
US3311177A
Cited
US3327790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-01 | 1973-03-03 | 1973-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-01 | 1977-03-03 | 1977-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-01 | 1981-03-03 | 1981-09-02 | $7700.00 | Window Closed / Lapsed |