Patent US2740872A successfully refreshed from Google Patents.
US2740872A
Expired / Lapsed
US
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Fluid-tight electric switches and methods of making the same
Assignee: Cutler Hammer Inc
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Filing: 1952-07-16
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Granted: 1956-04-03
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Expires: 1972-07-16
Abstract
No abstract record available.
Inventors
- 👤 Harry N Brodsky
- 👤 Blair H Chamberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:14
CPC Classifications
H; H01; H01H; H01H23/00; H01H23/02; H01H23/04; H01H23/06; H01H23/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1333004A
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US2345757A
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US2287650A
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US2367441A
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US2334901A
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US2428275A
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US2440943A
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US2462023A
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US2511436A
Cited
US2549323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |