Patent US3441098A successfully refreshed from Google Patents.
US3441098A
Expired / Lapsed
US
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Core drilling system
Assignee: Boyles Bros Drilling Co
•
Filing: 1966-08-10
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Granted: 1969-04-29
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Expires: 1986-08-10
Abstract
No abstract record available.
Inventors
- 👤 Lyle J Martinsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:08
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1142460A
Cited
US1716092A
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US2046798A
Cited
US2258352A
Cited
US2352612A
Cited
US3065794A
Cited
US3346059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |