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Patent US2546818A successfully refreshed from Google Patents.
US2546818A
Expired / Lapsed
US
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Electric switch contact protection
Assignee: AT&T Inc
•
Filing: 1946-04-23
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Granted: 1951-03-27
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Expires: 1966-04-23
Abstract
No abstract record available.
Inventors
- 👤 Curtis Lavalette Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:15
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/54
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |