US3564589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersion-type aquarium heater with automatic temperature control and malfunction shut-off
Assignee: Individual
•
Filing: 1969-10-13
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Granted: 1971-02-16
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Expires: 1989-10-13
Abstract
Abstract AN IMMERSION-TYPE ELECTRIC AQUARIUM HEATER CONSISTING OF A HOUSING, SECURABLE TO AN AQUARIUM WALL, IN COMBINATION WITH AN OPEN-NECKED TUBE OPENING INTO AND SUSPENDED FROM THE HOUSING, WITH A HEATING ELEMENT AND A MOUNTING-SUPPORTED TEMPERATURE-RESPONSIVE SWITCH UNIT DISPOSED WITHIN THE TUBE AND ELECTRICALLY CONNECTED IN A CIRCUIT TO AN ELECTRIC PLUG, WITH THE CONTACT POINTS OF THE SWITCH UNIT MEMBERS MANUALLY ADJUSTABLE WITH RESPECT TO EACH OTHER, AND A CAPACITOR ELECTRICALLY CONNECTED ACROSS THE LINES OF THE ELECTRIC PLUG IN A CIRCUIT PARALLEL TO THE CIRCUIT OF THE HEATING ELEMENT.
Inventors
- 👤 Henry M Arak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:26
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/78; H05B3/80; A; A01; A01K; A01K63/00; A01K63/06; A01K63/065; H01; H01H; H01H37/00; H01H37/02; H01H37/12; H01H37/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |