US2568888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wrench operated tap changer mechanism
Assignee: Allis Chalmers Corp
•
Filing: 1950-02-03
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Granted: 1951-09-25
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Expires: 1970-02-03
Abstract
No abstract record available.
Inventors
- 👤 Paul A Unverzagt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:51
CPC Classifications
H; H01; H01H; H01H27/00; H01H27/06; H01H27/08; H01H19/00; H01H19/02; H01H19/10; H01H19/11; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20732; Y10T74/20762
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) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |