Patent US3056879A successfully refreshed from Google Patents.
US3056879A
Expired / Lapsed
US
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Electric heating element for water tanks and method
Assignee: Thermo-Craft Electric Corp
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Filing: 1960-03-24
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Granted: 1962-10-02
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Expires: 1980-03-24
Abstract
No abstract record available.
Inventors
- 👤 Harry C Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:55
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/78; H05B3/82; F; F24; F24H; F24H1/00; F24H1/18; F24H1/20; F24H1/201; F24H1/202; F24H9/00; F24H9/18; F24H9/1809; F24H9/1818; F24H9/40; F24H9/45; H05B3/02; H05B3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1875306A
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US855210A
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US2533492A
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US2575150A
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US2648805A
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US2723340A
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US2810815A
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US2772343A
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US2959692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |