Patent US2666838A successfully refreshed from Google Patents.
US2666838A
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US
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Thermostatically controlled electric water heater
Assignee: PYRAMID AQUARIUMS Inc
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Filing: 1953-07-29
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Granted: 1954-01-19
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Expires: 1973-07-29
Abstract
No abstract record available.
Inventors
- 👤 Krah Edward
- 👤 Krah Carl
- 👤 Rudy Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:53
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/06; A01K63/065; H; H05; H05B; H05B3/00; H05B3/78; H05B3/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1209862A
Cited
US1670437A
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US1662555A
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US1855018A
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US1837000A
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US2201703A
Cited
US2576688A
Cited
US2477363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |