Patent US2509931A successfully refreshed from Google Patents.
US2509931A
Expired / Lapsed
US
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Rotary multiple contactor
Assignee: AT&T Inc
•
Filing: 1946-12-10
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Granted: 1950-05-30
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Expires: 1966-12-10
Abstract
No abstract record available.
Inventors
- 👤 Hubert K Krantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:58
CPC Classifications
H; H01; H01H; H01H19/00; H01H19/54; H01H19/56; H01R; H01R39/00; H01R39/64
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) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |