Patent US3525967A successfully refreshed from Google Patents.
US3525967A
Expired / Lapsed
US
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Safety switch arrangement for electrical resistance heaters
Assignee: Individual
•
Filing: 1968-07-25
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Granted: 1970-08-25
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Expires: 1988-07-25
Abstract
No abstract record available.
Inventors
- 👤 Siegfried Stauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:17
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2007; F24H9/2014; F24H9/2028; A; A47; A47J; A47J31/00; A47J31/44; A47J31/54; A47J31/542; A47J31/545; F24H15/00; F24H15/10; F24H15/128; F24H15/132; H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/46; H01H37/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE562509A
Cited
US1803852A
Cited
US1859605A
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US1912921A
Cited
US2187418A
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US2793268A
Cited
US3130354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |