Patent US2650387A successfully refreshed from Google Patents.
Patent US2461528A successfully refreshed from Google Patents.
US2461528A
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Rock drill
Assignee: Joy Manufacturing Co
•
Filing: 1943-07-01
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Granted: 1949-02-15
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Expires: 1963-07-01
Abstract
No abstract record available.
Inventors
- 👤 John C Curtis
- 👤 Elmer G Gartin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:15
CPC Classifications
E; E21; E21B; E21B6/00; E21B19/00; E21B19/08; E21B19/086; F; F01; F01B; F01B17/00; F01B17/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86501
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |