Patent US3744963A successfully refreshed from Google Patents.
Patent US2288544A successfully refreshed from Google Patents.
US2288544A
Expired / Lapsed
US
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Rock drilling apparatus
Assignee: Sullivan Machinery Co
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Filing: 1940-06-25
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Granted: 1942-06-30
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Expires: 1960-06-25
Abstract
No abstract record available.
Inventors
- 👤 John C Curtis
- 👤 Elmer G Gartin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:00
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1587; Y10T74/1592
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) | 1945-06-29 | 1945-12-29 | 1946-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-06-29 | 1949-12-29 | 1950-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-06-29 | 1953-12-29 | 1954-06-30 | $7700.00 | Window Closed / Lapsed |