Patent US768915A successfully refreshed from Google Patents.
US768915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill-rod clutch.
Assignee: Individual
•
Filing: 1903-10-28
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Granted: 1904-08-30
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Expires: 1923-10-28
Abstract
No abstract record available.
Inventors
- 👤 Frederick B Stoner
- 👤 Calvin Hotaling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:28
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/12; E21B31/18; Y; Y10; Y10T; Y10T24/00; Y10T24/46; Y10T24/4604; Y10T24/4605; Y10T24/4609; Y10T24/462
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) | 1907-08-30 | 1908-02-29 | 1908-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1911-08-30 | 1912-02-29 | 1912-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1915-08-30 | 1916-02-29 | 1916-08-30 | $7700.00 | Window Closed / Lapsed |