US2959398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth-boring apparatus
Assignee: J H HOLAN CORP
•
Filing: 1956-08-15
•
Granted: 1960-11-08
•
Expires: 1976-08-15
Abstract
No abstract record available.
Inventors
- 👤 Herman J Troche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:57
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1622704A
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US2414072A
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US2508606A
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US2490471A
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US2645458A
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US2687808A
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US2812162A
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US2783626A
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US2703222A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |