Patent US2883891A successfully refreshed from Google Patents.
US2883891A
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US
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Drill unit
Assignee: Gardner Denver Inc
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Filing: 1955-09-29
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Granted: 1959-04-28
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Expires: 1975-09-29
Abstract
No abstract record available.
Inventors
- 👤 Robert B Shulters
- 👤 Claude L Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:11
CPC Classifications
B; B23; B23B; B23B49/00; B23B49/003; B23B49/006; B25; B25F; B25F5/00; B25F5/003; Y; Y10; Y10T; Y10T408/00; Y10T408/55; Y10T408/564; Y10T408/5653; Y10T408/65; Y10T408/675; Y10T408/6757
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |