US4288462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for removing cationic contaminants from beverages
Assignee: 3M Purification Inc
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Filing: 1980-02-04
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Granted: 1981-09-08
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Expires: 2000-02-04
Abstract
Abstract Process for production of anionically charged filter media sheet including pretreatment of filter elements with cationic charge modifier, preferably employing inorganic colloidal silica charge modifiers. The resulting filters are used for the removal of haze or haze formers from beverages.
Inventors
- 👤 Kenneth C. Hou
- 👤 Eugene A. Ostreicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:27
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/68; A; A23; A23L; A23L2/00; A23L2/70; A23L2/72; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/18; D21H27/00; D21H27/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A process for the removal of haze or haze formers which are cationic submicronic proteinaceous contaminants from a beverage, comprising conducting a beverage containing such contaminants through a filter media having an anionic electrokinetic capture potential for such contaminants, the filter media being prepared by: a. treating filter elements selected from the group consisting of cellulose pulp and particulate filter aids with an amount of inorganic cationic colloidal silica surface charge modifier to render the surface of the filter elements receptive to the subsequent deposition of an inorganic anionic colloidal silica charge modifier, thereafter, b. charge modifying the treated filter elements with an inorganic anionic colloidal silica charge modifier, and c. forming the filter elements into a sheet having a negative zeta potential and a wet strength of at least 2.5 kg/in.
Claim 2
Dependent Claim
132 words
A process for the removal of haze or haze formers which are cationic submicronic proteinaceous contaminants from a beverage, comprising conducting a beverage containing such contaminants through a filter media having an anionic electrokinetic capture potential for such contaminants, the filter media being prepared by: a. treating filter elements selected from the group consisting of cellulose pulp and particulate filter aids with an amount of inorganic cationic colloidal silica surface charge modifier to render the surface of the filter elements receptive to the subsequent deposition of an inorganic anionic colloidal silica charge modifier, thereafter, b. charge modifying the treated filter elements with an inorganic anionic colloidal silica charge modifier, and c. forming the filter elements into a sheet having a negative zeta potential and a wet strength of at least 2.5 kg/in.
Claim 3
Dependent Claim
26 words
The process of claim 1, wherein the amount of cationic charge modifier is at least sufficient to render the surface charge of the filter elements electroneutral.
Claim 4
Dependent Claim
28 words
The process of claim 1, wherein the cationic charge modifier is employed in an amount of from about 0.1 to about 1.0 weight percent of the filter elements.
Claim 5
Dependent Claim
29 words
The process of claim 1 or 3, wherein the anionic charge modifier is employed in an amount of from about 1 to 10% by weight of the filter elements.
Claim 6
Dependent Claim
12 words
The process of claim 1, wherein the particulate filter aid is siliceous.
Claim 7
Dependent Claim
17 words
The process of claim 1, wherein the haze or haze formers are produced by chilling the beverage.
Claim 8
Dependent Claim
22 words
The process of claim 1, wherein the haze or haze formers are produced by conducting the fluid through a cationic filter media.
Claim 9
Dependent Claim
22 words
The process of claim 7, wherein the cationic filter media has the surface thereof modified with a polyamido polyamine epichlorhydrin cationic resin.
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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |