US3720318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter and water recirculation system
Assignee: CONN B
•
Filing: 1971-03-23
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Granted: 1973-03-13
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Expires: 1991-03-23
Abstract
Abstract An aquarium filter water recirculation system comprises a watercarrying and an inner air-carrying member attached to a base member which is supported above the floor of an aquarium. Air is passed through the inner cylindrical tube, diffused, and mixed with the water in the water-carrying member. The base member is made of polyvinyl chloride and is provided with a corrugated regular contour above which rests the gravel bed of the aquarium.
Inventors
- 👤 H Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:02
CPC Classifications
A; A01; A01K; A01K63/00; A01K63/04; A01K63/045
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
166 words
For an aquarium system with water, an undergravel aquarium filter and water recirculation system comprising a base member adapted to rest below said gravel, a rigid outer water-carrying tube carrying water from the bottom of the aquarium and discharging the water on top of the water in the aquarium, a rigid inner air-carrying tube located within said outer water-carrying tube to discharge air into the path of flow of the water being carried by said water-carrying tube, said water-carrying tube having a substantially vertical portion and a substantially horizontal portion connected together to carry said water vertically upward and discharge said water respectively, said substantially horizontal portion including an aperture, said inner air-carrying member frictionally fitting within and cooperating with said aperture to fix the vertical position of said inner tube with respect to said outer tube, said inner tube being selectively and fixedly manually adjustable to selected heights with respect to said outer tube and being frictionally held in said selected heights by said aperture.
Claim 2
Dependent Claim
166 words
For an aquarium system with water, an undergravel aquarium filter and water recirculation system comprising a base member adapted to rest below said gravel, a rigid outer water-carrying tube carrying water from the bottom of the aquarium and discharging the water on top of the water in the aquarium, a rigid inner air-carrying tube located within said outer water-carrying tube to discharge air into the path of flow of the water being carried by said water-carrying tube, said water-carrying tube having a substantially vertical portion and a substantially horizontal portion connected together to carry said water vertically upward and discharge said water respectively, said substantially horizontal portion including an aperture, said inner air-carrying member frictionally fitting within and cooperating with said aperture to fix the vertical position of said inner tube with respect to said outer tube, said inner tube being selectively and fixedly manually adjustable to selected heights with respect to said outer tube and being frictionally held in said selected heights by said aperture.
Claim 3
Dependent Claim
20 words
A device as set forth in claim 1, wherein said water-carrying tube is cylindrical and said air-carrying member is cylindrical.
Claim 4
Dependent Claim
19 words
A device as set forth in claim 1, wherein said top portion is above the water in said aquarium.
Claim 5
Dependent Claim
17 words
A device as set forth in claim 1, wherein said air-carrying and said water-carrying tubes are plastic.
Claim 6
Dependent Claim
13 words
A device as set forth in claim 4, wherein said plastic is butyrate.
Claim 7
Dependent Claim
21 words
A device as set forth in claim 1, comprising an air diffuser connected to said distal end of said air-carrying tube.
Claim 8
Dependent Claim
19 words
A device as set forth in claim 1, wherein said air-carrying tube is substantially coaxial with said water-carrying tube.
Claim 9
Dependent Claim
45 words
A device as set forth in claim 1, wherein said aquarium is provided with a gravel bed and a floor and said base member comprises a plate and support means for supporting said gravel bed above said plate and maintaining said plate above said floor.
Claim 10
Dependent Claim
18 words
A device as set forth in claim 8, wherein said support means are integrally formed with said plate.
Claim 11
Dependent Claim
34 words
A device as set forth in claim 8, wherein said plate is corrugated having alternating crown and valley regions, said valley regions being provided with apertures allowing water in said aquarium system to pass.
Claim 12
Dependent Claim
13 words
A device as set forth in claim 8, wherein said plate is non-porous.
Claim 13
Dependent Claim
16 words
A device as set forth in claim 11, wherein said plate is made of polyvinyl chloride.
Claim 14
Dependent Claim
50 words
A device as set forth in claim 10, wherein the path of flow of said water is below said base memBer and the height of said crowns are higher than the path of flow of said water to provide dormant zones fostering the growth of algae in said dormant zones.
Claim 15
Dependent Claim
106 words
In an aquarium having a gravel bed and a floor, a base member comprising a plate and support means for supporting said gravel bed above said plate and maintaining said plate above said floor, said plate being non-porous and corrugated in shape having alternating crown and valley regions, said valley regions being provided with apertures allowing water in said aquarium system to pass, the path of flow of the water in said aquarium being below said base member, the height of said crowns being higher than the path of travel of said water to form dormant zones fostering the growth of algae in said dormant zones.
Claim 16
Dependent Claim
106 words
In an aquarium having a gravel bed and a floor, a base member comprising a plate and support means for supporting said gravel bed above said plate and maintaining said plate above said floor, said plate being non-porous and corrugated in shape having alternating crown and valley regions, said valley regions being provided with apertures allowing water in said aquarium system to pass, the path of flow of the water in said aquarium being below said base member, the height of said crowns being higher than the path of travel of said water to form dormant zones fostering the growth of algae in said dormant zones.
Claim 17
Dependent Claim
17 words
A device as set forth in claim 14, wherein said support means is integral with said plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |