US4713173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three element aquarium filter cartridge
Assignee: Penn-Plax Plastics Inc
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Filing: 1986-01-03
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Granted: 1987-12-15
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Expires: 2006-01-03
Abstract
Abstract A filter cartridge for use in aquarium filtration systems having mechanical, chemical and biological filtration elements. The mechanical element forms the front wall of the filter cartridge and this is bonded around the outer border thereof to a back member. The back member may be rigid or semi-rigid.
Inventors
- 👤 Jerome Goldman
- 👤 Marvin Goldman
- 👤 Terry Goldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:48
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; A; A01; A01K; A01K63/00; A01K63/04; A01K63/045; C02F3/00; C02F3/02; C02F3/10; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
125 words
A filter cartridge for aquarium using comprising: (a) a mechanical filtration element forming a front wall of the filter cartridge; (b) a back member which is able to let water pass therethrough, forming a back wall of the filter cartridge, the mechanical element and back member sealed to each other around the outer borders thereof; (c) a chemical filtration element sandwiched between the front wall mechanical filter element end back member, and; (d) a biological filtration element which is formed from a material selected from the following group consisting of natural sponge, synthetic sponge, and foam, also sandwiched between the front wall mechanical filtration element and the back member, the back member of the filter cartridge being a distinct component from the biological filtration element.
Claim 2
Dependent Claim
125 words
A filter cartridge for aquarium using comprising: (a) a mechanical filtration element forming a front wall of the filter cartridge; (b) a back member which is able to let water pass therethrough, forming a back wall of the filter cartridge, the mechanical element and back member sealed to each other around the outer borders thereof; (c) a chemical filtration element sandwiched between the front wall mechanical filter element end back member, and; (d) a biological filtration element which is formed from a material selected from the following group consisting of natural sponge, synthetic sponge, and foam, also sandwiched between the front wall mechanical filtration element and the back member, the back member of the filter cartridge being a distinct component from the biological filtration element.
Claim 3
Dependent Claim
27 words
The filter cartridge of claim 1, wherein the back member is formed from a rigid material which has openings formed therein to allow the passage of water.
Claim 4
Dependent Claim
35 words
The filter cartridge of claim 2 wherein the chemical filtration member is formed from coarse granules of at least one member selected from the group consisting of charcoal, carbon, activated carbon, filtering resins, and zeolite.
Claim 5
Dependent Claim
18 words
The filter cartridge of claim 3, wherein the biological filter element is in the form of a sheet.
Claim 6
Dependent Claim
40 words
The filter cartridge of claim 2, further comprising a recessed portion centrally located in the back member, for the placement of the biological filteration element, and the openings formed in the back member being present only in the recessed area.
Claim 7
Dependent Claim
30 words
The filter cartridge of claim 2 wherein the mechanical filtration element is a sheet made from one material choosen from the group consisting of dacron, felt, filter floss, and paper.
Claim 8
Dependent Claim
27 words
The filter cartridge of claim 1, wherein the back member is formed from a semi-rigid material which has openings formed therein to allow the passage of water.
Claim 9
Dependent Claim
40 words
The filter cartridge of claim 7, further comprising a recessed portion centrally located in the back member, for the placement of the biological filteration element, and the openings formed in the back member being present only in the recessed area.
Claim 10
Dependent Claim
30 words
The filter cartridge of claim 7 wherein the mechanical filtration element is a sheet made from one material choosen from the group consisting of dacron, felt, filter floss, and paper.
Claim 11
Dependent Claim
35 words
The filter cartridge of claim 7 wherein the chemical filtration member is formed from coarse granules of at least one member selected from the group consisting of charcoal, carbon, activated carbon, filtering resins, and zeolite.
Claim 12
Dependent Claim
18 words
The filter cartridge of claim 7, wherein the biological filter element is in the form of a sheet.
Claim 13
Dependent Claim
14 words
The filter cartridge of claim 7 wherein the back member is made of plastic.
Claim 14
Dependent Claim
30 words
The filter cartridge of claim 1 wherein the mechanical filtration element is a sheet made from one material choosen from the group consisting of dacron, felt, filter floss, and paper.
Claim 15
Dependent Claim
35 words
The filter cartridge of claim 1 wherein the chemical filtration member is formed from coarse granules of at least one member selected from the group consisting of charcoal, carbon, activated carbon, filtering resins, and zeolite.
Claim 16
Dependent Claim
18 words
The filter cartridge of claim 1, wherein the biological filter element is in the form of a sheet.
Claim 17
Dependent Claim
18 words
The filter cartridge of claim 1 wherein the front and back walls are sealed using an adhesive sealer.
Claim 18
Dependent Claim
29 words
The filter cartridge of claim 1 wherein the front and back walls are sealed using a radio frequency sealer, a dielectric sealer, an ultrasonic sealer, or an impulse sealer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |