Patent US3480094A successfully refreshed from Google Patents.
US3480094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill collar for protecting drill string
Assignee: Individual
•
Filing: 1968-03-21
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Granted: 1969-11-25
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Expires: 1988-03-21
Abstract
No abstract record available.
Inventors
- 👤 James B N Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:48
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3103391A
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US2651199A
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US2690934A
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US2863704A
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US3054647A
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US3148004A
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US3268274A
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US3320004A
Cited
US3343890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |