US4276177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency filtration with impurity concentration and ultrafiltration rejection flow recirculation
Assignee: Vaponics Inc
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Filing: 1979-08-13
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Granted: 1981-06-30
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Expires: 1999-08-13
Abstract
Abstract The rejection flow from a water ultrafiltration system is passed through a filtration means for removal of bacteria, viri, pyrogens, and colloids, the effluent of which is reintroduced into the affluent presented to the ultrafiltration surface. Treatment of the refjection flow prior to ultrafiltration after removal of bacteria, viri, pyrogens, and colloids may include carbon filtration followed by ion exchange treatment.
Inventors
- 👤 Verity C. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:02
CPC Classifications
C; C02; C02F; C02F9/00; B; B01; B01D; B01D61/00; B01D61/14; B01D61/145; B01D65/00; B01D65/08; B01J; B01J39/00; B01J39/04; B01J47/00; B01J47/02; B01J47/04; B01D2313/00; B01D2313/90; B01D2313/901; B01D2321/00; B01D2321/16; B01D2321/162; B01D2321/164
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A process for the purification of water comprising: (a) providing a flow of raw water to be purified; (b) pretreating said raw water flow for partial purification; (c) introducing the flow of raw water exiting the pretreatment in (b) into an ultrafilter to produce a flow of purified water and a rejection flow exiting the ultrafilter; (d) passing only said rejection flow through a large-pore macroreticular anion exchange resin to remove contaminants from said reject flow; (e) combining the rejection flow from step (d) with the raw water introduced into the ultrafilter in step (c) to form a circulating loop.
Claim 2
Dependent Claim
100 words
A process for the purification of water comprising: (a) providing a flow of raw water to be purified; (b) pretreating said raw water flow for partial purification; (c) introducing the flow of raw water exiting the pretreatment in (b) into an ultrafilter to produce a flow of purified water and a rejection flow exiting the ultrafilter; (d) passing only said rejection flow through a large-pore macroreticular anion exchange resin to remove contaminants from said reject flow; (e) combining the rejection flow from step (d) with the raw water introduced into the ultrafilter in step (c) to form a circulating loop.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein sufficient pressure is applied to the combined flow formed in (e) to cause about 95% of the combined volume to pass through the ultrafilter to become the purified water.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein said raw water is passed through a series of pretreatments, inclusive of carbon filtration, prior to being combined with the rejection flow in step (e).
Claim 5
Dependent Claim
22 words
The process as set forth in claim 3 wherein said pretreatments include carbon filtration, followed by cation exchange, followed by anion exchange.
Claim 6
Dependent Claim
46 words
The process as set forth in claim 1 wherein the water delivered from said large-pore macroreticular anion exchange resin is mixed with said raw water and is pretreated with said raw water by carbon filtration followed by ion exchange prior to being introduced into the ultrafilter.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the pretreatment of (b) is by passing said flow of raw water through a carbon filter.
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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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |