Patent US1708975A successfully refreshed from Google Patents.
US1708975A
Expired / Lapsed
US
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Rock-drilling apparatus
Assignee: Gardner Denver Inc
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Filing: 1925-12-18
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Granted: 1929-04-16
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Expires: 1945-12-18
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Skaer
- 👤 August H Katterjohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:09
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01; E21B21/011; E21B21/013; E21B21/0135
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) | 1932-04-15 | 1932-10-15 | 1933-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-04-15 | 1936-10-15 | 1937-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-04-15 | 1940-10-15 | 1941-04-16 | $7700.00 | Window Closed / Lapsed |