US3872013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bactericidal water purifier for dechlorinated water
Assignee: Panasonic Holdings Corp
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Filing: 1973-11-08
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Granted: 1975-03-18
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Expires: 1993-11-08
Abstract
Abstract Porous sheets of a water insoluble material such as a synthetic fiber coated with a bactericidal substance such as a sparingly soluble halide of a Group IB heavy metal are placed between the activated carbon layer and outlet of a water purifier. Additional provision of calcium carbonate granules in the purifier is effective in improving the bactericidal efficiency.
Inventors
- 👤 Atsushi Nishino
- 👤 Yukihide Iura
- 👤 Masayoshi Kubo
- 👤 Motosi Tateisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:30
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/14; B01D69/141; B01D69/147; C; C02; C02F; C02F1/00; C02F1/50; C02F1/505; C02F1/72; C02F1/76; C02F1/766; C02F9/00; C02F9/20; B01D2325/00; B01D2325/48
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
IN A WATER PURIFIER HAVING ABSORPTION MEANS TO DECHLORINATE POTABLE WATER SUPPLIED THERETO, A FILTER ASSEMBLY TO FILTER AND STERILIZE THE WATER, COMPRISING TWO LAYERS OF FILTER CLOTH JOINED WITH EACH OTHER TO FORM A SPACE THEREBETWEEN, A WATER CONDUIT COMMUNICATING WITH SAID SPACE AND WITH AN OUTLET OF THE PURIFIER, AT LEAST ONE SHEET OF A SYNTHETIC FIBER NON-WOVEN CLOTH HAVING A THICKNESS OF 0.01 TO 5 MM AND COATED AND IMPREGNATED WITH A BACTERICIDAL SUBSTANCE AND ARRANGED IN SAID SPACE TO BE SUBSTANTIALLY OPPOSITE THE ENTIRE INNER SURFACES OF SAID FILTER CLOTH LAYERS, AND AT LEAST ONE SUPPORT MEMBER HAVING A MULTIPLICITY OF OPENINGS TO ALLOW WATER TO FLOW FREELY THERETHROUGH ARRANGED IN SAID SPACE TO PREVENT SAID SHEET FROM CONTACTING SAID FILTER CLOTH LAYERS, SO THAT SAID SHEET IS EXPOSED TO THE FILTERED WATER AND EXERTS A BACTERICIDAL ACTION THEREON.
Claim 2
Dependent Claim
143 words
IN A WATER PURIFIER HAVING ABSORPTION MEANS TO DECHLORINATE POTABLE WATER SUPPLIED THERETO, A FILTER ASSEMBLY TO FILTER AND STERILIZE THE WATER, COMPRISING TWO LAYERS OF FILTER CLOTH JOINED WITH EACH OTHER TO FORM A SPACE THEREBETWEEN, A WATER CONDUIT COMMUNICATING WITH SAID SPACE AND WITH AN OUTLET OF THE PURIFIER, AT LEAST ONE SHEET OF A SYNTHETIC FIBER NON-WOVEN CLOTH HAVING A THICKNESS OF 0.01 TO 5 MM AND COATED AND IMPREGNATED WITH A BACTERICIDAL SUBSTANCE AND ARRANGED IN SAID SPACE TO BE SUBSTANTIALLY OPPOSITE THE ENTIRE INNER SURFACES OF SAID FILTER CLOTH LAYERS, AND AT LEAST ONE SUPPORT MEMBER HAVING A MULTIPLICITY OF OPENINGS TO ALLOW WATER TO FLOW FREELY THERETHROUGH ARRANGED IN SAID SPACE TO PREVENT SAID SHEET FROM CONTACTING SAID FILTER CLOTH LAYERS, SO THAT SAID SHEET IS EXPOSED TO THE FILTERED WATER AND EXERTS A BACTERICIDAL ACTION THEREON.
Claim 3
Dependent Claim
16 words
A filter assembly as claimed in claim 1, in which said bactericidal substance is silver chloride.
Claim 4
Dependent Claim
50 words
A filter assembly as claimed in claim 2, and further comprising granular calcium carbonate in at least a portion of said space in such an amount that the pH value of the filtrated water is increased up to 8.6 thereby to maintain the silver ion concentration therein below 50 ppb.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |