Patent US2552840A successfully refreshed from Google Patents.
US2552840A
Expired / Lapsed
US
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Automatically reversible air-driven tapping unit
Assignee: Individual
•
Filing: 1948-05-07
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Granted: 1951-05-15
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Expires: 1968-05-07
Abstract
No abstract record available.
Inventors
- 👤 Stanley A Burke
- 👤 Harold C Hansen
- 👤 Calvin P Bullard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:11
CPC Classifications
B; B23; B23G; B23G1/00; B23G1/16; Y; Y10; Y10T; Y10T408/00; 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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |