Patent US1868670A successfully refreshed from Google Patents.
US1868670A
Expired / Lapsed
US
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Back head construction for rock drills
Assignee: Chicago Pneumatic Tool Co LLC
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Filing: 1930-07-15
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Granted: 1932-07-26
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Expires: 1950-07-15
Abstract
No abstract record available.
Inventors
- 👤 Gustave M Nell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:08
CPC Classifications
E; E21; E21B; E21B6/00; E21B6/06; E21B1/00; E21B1/12; E21B1/24; E21B1/30; E21B21/00; E21B21/01; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1527
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) | 1935-07-26 | 1936-01-25 | 1936-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-07-26 | 1940-01-25 | 1940-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-07-26 | 1944-01-25 | 1944-07-26 | $7700.00 | Window Closed / Lapsed |