Patent US3796858A successfully refreshed from Google Patents.
US3796858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decorative aquarium heater
Assignee: Individual
•
Filing: 1972-12-05
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Granted: 1974-03-12
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Expires: 1992-12-05
Abstract
Abstract An electrical resistance heater is embedded in an electrically insulating mass configured as a natural element of an aquarium such as a leaf, coral or diver for example. A base adapted to receive the heater component is provided for location under the gravel in the base of the tank. A temperature controlling circuit is provided utilizing solid state devices in a manner permitting a degree of proportional control and eliminating the arcing and potential electrical hazards associated with the conventional bimetallic strip aquarium thermostats.
Inventors
- 👤 J Cohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:36
CPC Classifications
F; F24; F24H; F24H1/00; A; A01; A01K; A01K63/00; A01K63/06; A01K63/065; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/20; G05D23/24; H; H05; H05B; H05B3/00; H05B3/78; H05B3/80
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
An aquarium heater comprising, in combination: a. An electric heater element, b. temperature sensing means, c. a mass of electrical insulation material in which both said heater element and said temperature sensing means are embedded in direct physical contact with said mass, means for supporting said mass of insulation material d. line current supplying means for said heater element, e. control means adapted for mounting externally of said aquarium and electrically connected to said line current supplying means, said heater element and said temperature sensing means, said control means being responsive to said temperature sensing means to control flow of electrical power to said heater.
Claim 2
Dependent Claim
105 words
An aquarium heater comprising, in combination: a. An electric heater element, b. temperature sensing means, c. a mass of electrical insulation material in which both said heater element and said temperature sensing means are embedded in direct physical contact with said mass, means for supporting said mass of insulation material d. line current supplying means for said heater element, e. control means adapted for mounting externally of said aquarium and electrically connected to said line current supplying means, said heater element and said temperature sensing means, said control means being responsive to said temperature sensing means to control flow of electrical power to said heater.
Claim 3
Dependent Claim
18 words
The heater of claim 1 wherein said mass of electrical insulation material is formed into a decorative configuration.
Claim 4
Dependent Claim
42 words
The heater of claim 2 wherein means for supporting said mass of electrical insulation material on the base of the aquarium comprises releasable base means engaging said decorative mass of electrical insulation material and being adapted to be buried under aquarium gravel.
Claim 5
Dependent Claim
13 words
The heater of claim 1 wherein said temperature sensing element is a thermistor.
Claim 6
Dependent Claim
30 words
The heater of claim 4 wherein said control means comprises a silicon controlled rectifier controlling current flow to said heater in response to changes in the resistance of said thermistor.
Claim 7
Dependent Claim
21 words
The heater of claim 1 wherein said heater and thermistor are connected to said control means by insulated, solid, non-braided wire.
Claim 8
Dependent Claim
106 words
An aquarium heater comprising, in combination: a. An electric heater element adapted to be supported on the base of an aquarium and comprising a resistance wire stitched into a fabric and embedded in a mass of reinforced plastic electrical insulation, b. temperature sensing means adapted to be located within said aquarium, c. line current supplying means for said heater element, d. control means adapted for mounting externally of said aquarium and electrically connected to said line current supplying means, said heater element and said temperature sensing means, said control means being responsive to said temperature sensing means to control flow of electrical power to said heater.
Claim 9
Dependent Claim
106 words
An aquarium heater comprising, in combination: a. An electric heater element adapted to be supported on the base of an aquarium and comprising a resistance wire stitched into a fabric and embedded in a mass of reinforced plastic electrical insulation, b. temperature sensing means adapted to be located within said aquarium, c. line current supplying means for said heater element, d. control means adapted for mounting externally of said aquarium and electrically connected to said line current supplying means, said heater element and said temperature sensing means, said control means being responsive to said temperature sensing means to control flow of electrical power to said heater.
Claim 10
Dependent Claim
18 words
The heater of claim 7 wherein the insulation of said electric heater is formed into a decorative configuration.
Claim 11
Dependent Claim
27 words
The heater of claim 8 further comprising releasable base means engaging said decorative mass of electrical insulation material and being adapted to be buried under aquarium gravel.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |