US2725438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current switch mechanism
Assignee: Arrow Hart and Hegeman Electric Co
•
Filing: 1952-09-15
•
Granted: 1955-11-29
•
Expires: 1972-09-15
Abstract
No abstract record available.
Inventors
- 👤 Robert H Bentley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:35
CPC Classifications
H; H01; H01H; H01H23/00; H01H23/02; H01H23/12; H01H23/16; H01H23/168; H01H3/00; H01H3/60; H01H9/00; H01H9/30; H01H2009/307; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18888; Y10T74/18896; Y10T74/18904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1304377A
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US1200847A
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US2068713A
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US2158369A
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GB499043A
Cited
GB499496A
Cited
FR974056A
Cited
US2424116A
Cited
US2543000A
Cited
US2626335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |