Patent US3291376A successfully refreshed from Google Patents.
Patent US4913808A successfully refreshed from Google Patents.
US4913808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subcompact interchangeable cartridge drinking water purification system
Assignee: Individual
•
Filing: 1988-10-03
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Granted: 1990-04-03
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Expires: 2008-10-03
Abstract
Abstract A domestic subcompact portable unit with one comprehensive replacable cartridge for the purification of drinking water in the super pure form through the use of two stage activated carbon, multilayer mixed-bed demineralization and submicron filtration. The system can be very conveniently installed in the kitchen sink faucet with easy interchange of the combination cartridge to provide drinking water in the purest form free from organics, bacteria, minerals and suspended particles.
Inventors
- 👤 Maqsood Haque
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:57
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/02; B01J47/022; B01J47/024; C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; C02F1/28; C02F1/283; C02F2201/00; C02F2201/002; C02F2201/006; Y; Y02; Y02A; Y02A20/00; Y02A20/20; Y02A20/208
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A water purifying device comprising: a container having a water inlet and a water outlet, said container being formed for replaceably holding a water filtration cartridge threin; said water filtration cartridge including four layers of water filtration material disposed within said container such that water from said inlet will pass through each said layer of filtration materials to said outlet; said layers of filtration materials including, in sequence, a first layer of activated carbon, a second layer of ion exchange resins, a third layer of activated carbon, and a fourth layer of sub-micron filtration material.
Claim 2
Dependent Claim
95 words
A water purifying device comprising: a container having a water inlet and a water outlet, said container being formed for replaceably holding a water filtration cartridge threin; said water filtration cartridge including four layers of water filtration material disposed within said container such that water from said inlet will pass through each said layer of filtration materials to said outlet; said layers of filtration materials including, in sequence, a first layer of activated carbon, a second layer of ion exchange resins, a third layer of activated carbon, and a fourth layer of sub-micron filtration material.
Claim 3
Dependent Claim
30 words
A water treatment device as claimed in claim 1 further comprising a resistivity sensor engaged with said water outlet for indicating the purity of water flowing through said water outlet.
Claim 4
Dependent Claim
25 words
A water treatment device as claimed in claim 1 wherein said ion exchange resins include a mixture of anion exchange resins and cation exchange resins.
Claim 5
Dependent Claim
21 words
A water treatment device as claimed in claim 1 wherein said ion exchange resins include high capacity mixed bed synthetic resins.
Claim 6
Dependent Claim
16 words
A water treatment device as claimed in claim 1 wherein said sub-micron filtration material is nylon.
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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) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |