Patent US1171790A successfully refreshed from Google Patents.
US1171790A
Expired / Lapsed
US
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Combined underreamer and bit.
Assignee: ROTARY EXPANSION BIT Co
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Filing: 1914-06-06
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Granted: 1916-02-15
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Expires: 1934-06-06
Abstract
No abstract record available.
Inventors
- 👤 Granville A Humason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:07
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/64; E21B10/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1919-02-14 | 1919-08-16 | 1920-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1923-02-14 | 1923-08-16 | 1924-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1927-02-14 | 1927-08-16 | 1928-02-15 | $7700.00 | Window Closed / Lapsed |