Patent US786952A successfully refreshed from Google Patents.
US786952A
Expired / Lapsed
US
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Rock-drill bit.
Assignee: JOHN WILLIAM GRAHAM JR
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Filing: 1904-02-26
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Granted: 1905-04-11
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Expires: 1924-02-26
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:33
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/003
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) | 1908-04-10 | 1908-10-10 | 1909-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-04-10 | 1912-10-10 | 1913-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-04-10 | 1916-10-10 | 1917-04-11 | $7700.00 | Window Closed / Lapsed |