US3022839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth boring apparatus
Assignee: HOLAN CORP
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Filing: 1959-07-07
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Granted: 1962-02-27
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Expires: 1979-07-07
Abstract
No abstract record available.
Inventors
- 👤 Herman J Troche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:11
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/087; E02; E02D; E02D1/00; E02D1/02; E21B3/00; E21B3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |