US5389254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water treatment system
Assignee: AMERICAN SAFEWATER TECHNOLOGY Inc
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Filing: 1993-08-13
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Granted: 1995-02-14
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Expires: 2013-08-13
Abstract
Abstract A method system for treating water in which the incoming effluent water is pre-filtered, passed through a reverse osmosis unit, post filtered to remove taste and odor and then passed to a holding tank. The holding tank is provided with a source of ultraviolet light to provide disinfection in the holding tank to eliminate bacterial growth prior to consumption of the water therein.
Inventors
- 👤 Lawrence C. Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:19
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/08; C; C02; C02F; C02F9/00; C02F9/20; C02F1/00; C02F1/001; C02F1/28; C02F1/283; C02F1/30; C02F1/32; C02F1/44; C02F1/441; C02F2201/00; C02F2201/32; C02F2201/326
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A system for treating water comprising: (a) a pre-filter for filtering influent water, (b) a reverse osmosis membrane for removing ionic level contaminants from the pre-filtered water, (c) a holding tank for receiving water from said reverse osmosis membrane, (d) a source of ultraviolet light within said holding tank for providing sufficient ultraviolet disinfection to eliminate bacterial growth in the water contained therein, wherein said holding tank maintains the water contained therein under pressure by means of a pressure maintaining diaphragm mounted within said tank, and (e) an outlet from said holding tank for dispensing potable water.
Claim 2
Independent Claim
97 words
A system for treating water comprising: (a) a pre-filter for filtering influent water, (b) a reverse osmosis membrane for removing ionic level contaminants from the pre-filtered water, (c) a holding tank for receiving water from said reverse osmosis membrane, (d) a source of ultraviolet light within said holding tank for providing sufficient ultraviolet disinfection to eliminate bacterial growth in the water contained therein, wherein said holding tank maintains the water contained therein under pressure by means of a pressure maintaining diaphragm mounted within said tank, and (e) an outlet from said holding tank for dispensing potable water.
Claim 3
Dependent Claim
33 words
The system of claim 1 further including a post-filter positioned between the reverse osmosis unit and the holding tank for filtering the odor and taste of the water emminating from the membrane unit.
Claim 4
Dependent Claim
13 words
The system of claim 2 wherein said post-filter is a granulated carbon filter.
Claim 5
Dependent Claim
33 words
The system of claim 2 wherein said ultraviolet light source comprises an elongated ultraviolet light mounted within said holding tank, said ultraviolet light having its axis of elongation extending perpendicular to the diaphragm.
Claim 6
Dependent Claim
20 words
The system of claim 1 wherein said pre-filter comprises a plurality of pre-filters positioned upstream of said reverse osmosis membrane.
Claim 7
Dependent Claim
24 words
The system of claim 1 further including a line connecting said reverse osmosis membrane to a drain to provide for removal of reject water.
Claim 8
Dependent Claim
25 words
The system of claim 1 futher including a timer means for indicating the length of time the source of ultraviolet light source is in operation.
Claim 9
Dependent Claim
16 words
The system of claim 1 futher including an ultraviolet light sensor mounted in said holding tank.
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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) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |