Patent US3521496A successfully refreshed from Google Patents.
US3521496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal mechanism and switch assembly
Assignee: Franklin Electric Co Inc
•
Filing: 1967-05-29
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Granted: 1970-07-21
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Expires: 1987-05-29
Abstract
No abstract record available.
Inventors
- 👤 Edward J Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:15
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/06; H01H35/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2039568A
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US2188559A
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US2611602A
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US2573514A
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US2797080A
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US3194914A
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US3058355A
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US3209093A
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US3244832A
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US3290463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |