US3780867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water purification apparatus and cartridge therefor
Assignee: H N IND Inc
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Filing: 1971-12-27
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Granted: 1973-12-25
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Expires: 1991-12-27
Abstract
Abstract Two-stage water purification apparatus having a cartridge disposed within a housing provided with a removable cap. The cartridge comprises a casing containing activated charcoal, two superposed grid-like sleeves surrounding the casing, and a diatomaceous earth layer between the two sleeves. Incoming water circulates from an inlet port in the cap through the outermost sleeve to the interior of the cartridge, and then out through an outlet port in the cap.
Inventors
- 👤 J Zirlis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:00
CPC Classifications
C; C02; C02F; C02F9/00; C02F9/20; C02F2201/00; C02F2201/002; C02F2201/006
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
136 words
In a cartridge for a water purification apparatus, the combination of: an elongated casing formed of a water impervious material and containing an activated charcoal filter medium, wherein at least one end of said casing is perforated for exit of purified water therefrom, and wherein the walls of said casing are perforated for entry of water therethrough, two superposed grid-like sleeves surrounding said casing, wherein each of said sleeves is defined by a grid of at least two layers, each said layer being formed of parallel strands, said layers being superposed such that the strands of any one layer are angularly disposed with respect to the strands of the next adjacent layer, whereby channels are provided for flow of water parallel to said strands, and a layer between said sleeves, comprising a diatomaceous earth filter medium.
Claim 2
Dependent Claim
136 words
In a cartridge for a water purification apparatus, the combination of: an elongated casing formed of a water impervious material and containing an activated charcoal filter medium, wherein at least one end of said casing is perforated for exit of purified water therefrom, and wherein the walls of said casing are perforated for entry of water therethrough, two superposed grid-like sleeves surrounding said casing, wherein each of said sleeves is defined by a grid of at least two layers, each said layer being formed of parallel strands, said layers being superposed such that the strands of any one layer are angularly disposed with respect to the strands of the next adjacent layer, whereby channels are provided for flow of water parallel to said strands, and a layer between said sleeves, comprising a diatomaceous earth filter medium.
Claim 3
Dependent Claim
26 words
A cartridge as in claim 1 wherein said layer of diatomaceous earth filter medium includes a fibrous material to support said diatomaceous earth in said casing.
Claim 4
Dependent Claim
24 words
A cartridge as in claim 1 wherein said sleeves comprise mesh of a gauge effective to retain coarse particulate matter in water flowing therethrough.
Claim 5
Dependent Claim
48 words
A cartridge as in claim 1 wherein the lengths of said sleeves and said layer of diatomaceous earth filter medium are short of the length of said casing, whereby the ends of said casing are adapted to be received in a recess in a housing for said cartridge.
Claim 6
Dependent Claim
18 words
A cartridge as in claim 1 further including a fibrous filtering medium positioned in said perforated exit end.
Claim 7
Dependent Claim
18 words
A cartridge as in claim 1 wherein said casing and said sleeves are formed of a plastic material.
Claim 8
Dependent Claim
48 words
In a water purification apparatus, the combination of: an elongated water impermeable housing having a water inlet port and a water outlet port, and a cartridge as defined in claim 1 positioned interiorly of said housing, wherein the exit end of said cartridge communicates with said outlet port.
Claim 9
Dependent Claim
51 words
Water purification apparatus as in claim 7 whrein the inlet port and outlet port are positioned in the same end of said housing, and the other end of said housing is closed and has a recess for receiving an end of said cartridge and centrally positioning said cartridge in said housing.
Claim 10
Dependent Claim
38 words
Water purification apparatus as in claim 7 wherein one end of said housing has a removable cap member thereon, and wherein said cap member has a pair of openings therethrough defining said inlet port and said outlet port.
Claim 11
Dependent Claim
21 words
Water purification apparatus as in claim 9 wherein said cap member is adapted to support said cartridge centrally within said housing.
Claim 12
Dependent Claim
31 words
Water purification apparatus as in claim 10 wherein said cap member is adapted for a press-fit onto said housing, said apparatus including means for retaining said cap member on said housing.
Claim 13
Dependent Claim
39 words
Water purification apparatus as in claim 11 wherein said retaining means comprises a plate member positioned bElow the end of said housing opposite said cap member, and a plurality of rods connecting said plate member to said cap member.
Claim 14
Dependent Claim
25 words
Water purification apparatus as in claim 7 wherein said housing is formed of a substantially transparent plastic material, and said housing and cartridge are cylindrical.
Claim 15
Dependent Claim
26 words
Water purification apparatus as in claim 13 including an annular channel between said housing and cartridge and longitudinal thereof, for flow of water throughout said apparatus.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |