US2543804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grounding arrangement for highfrequency transfer switches
Assignee: Girdler Corp
•
Filing: 1947-08-20
•
Granted: 1951-03-06
•
Expires: 1967-08-20
Abstract
No abstract record available.
Inventors
- 👤 Proctor Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:49
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/10; H01P1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1515578A
Cited
US983380A
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US2277555A
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US2337130A
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US2427940A
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US2419307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |