Patent US4617128A successfully refreshed from Google Patents.
US4617128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate filter aid, filter bed and process
Assignee: Specialty Materials Inc
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Filing: 1981-02-19
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Granted: 1986-10-14
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Expires: 2001-02-19
Abstract
Abstract Particulate filter aid coated with a sufficient amount of melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electropositive. Preferred filter aids are diatomaceous earth, perlite and defibered cellulose. The filter aid is used in a filter bed for filtering submicronic contaminants.
Inventors
- 👤 Eugene A. Ostreicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:16
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/02; B01D39/06; B01D39/04; B01D2239/00; B01D2239/04; B01D2239/0414; B01D2239/0471; B01D2239/0485; B01D2239/12; B01D2239/1241
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
25 words
Particulate diatomaceous earth filter aid coated with a sufficient amount of malamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 2
Dependent Claim
25 words
Particulate diatomaceous earth filter aid coated with a sufficient amount of malamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 3
Dependent Claim
25 words
Particulate perlite filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 4
Dependent Claim
25 words
Particulate perlite filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 5
Dependent Claim
24 words
Defibered cellulose filter aid coated with a sufficient amount of melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 6
Dependent Claim
24 words
Defibered cellulose filter aid coated with a sufficient amount of melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 7
Dependent Claim
24 words
The filter aid of claim 1, 2, or 3, wherein the filter aid exhibits an average particulate dimension of less than about 10 microns.
Claim 8
Dependent Claim
24 words
The filter aid of claim 1, 2, or 3, wherein the filter aid exhibits an average particulate dimension of less than about 5 microns.
Claim 9
Dependent Claim
23 words
The filter aid of claim 1, 2, or 3, wherein the filter aid exhibits a specific area in excess of one square meter/gram.
Claim 10
Dependent Claim
29 words
A filter bed comprised of particulate filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 11
Dependent Claim
29 words
A filter bed comprised of particulate filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 12
Dependent Claim
31 words
A filter bed comprised of particulate diatomaceous earth filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 13
Dependent Claim
31 words
A filter bed comprised of particulate diatomaceous earth filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 14
Dependent Claim
30 words
A filter bed comprised of particulate perlite filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 15
Dependent Claim
30 words
A filter bed comprised of particulate perlite filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 16
Dependent Claim
30 words
A filter bed comprised of defibered cellulose filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 17
Dependent Claim
30 words
A filter bed comprised of defibered cellulose filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 18
Dependent Claim
25 words
The filter bed of claim 7, 8, 9, or 10, wherein the filter aid exhibits an average particulate dimension of less than about 10 microns.
Claim 19
Dependent Claim
25 words
The filter bed of claim 7, 8, 9, or 10, wherein the filter aid exhibits an average particulate dimension of less than about 5 microns.
Claim 20
Dependent Claim
26 words
The filter bed of claim 7, 8, 9, or 10, wherein the filter aid exhibits a specific area in excess of one square meter per gram.
Claim 21
Independent Claim
47 words
A method for the removal of negatively charged submicron particulate contaminates from a fluid comprising passing the contaminated fluid through a filter bed comprising particulate filter aid coated with a sufficient amount of melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 22
Independent Claim
47 words
A method for the removal of negatively charged submicron particulate contaminates from a fluid comprising passing the contaminated fluid through a filter bed comprising particulate filter aid coated with a sufficient amount of melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 23
Independent Claim
50 words
A method for the removal of negatively charged submicron particulate contaminates from a fluid comprising passing the contaminated fluid through a filter bed comprising particulate diatomaceous earth filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 24
Independent Claim
50 words
A method for the removal of negatively charged submicron particulate contaminates from a fluid comprising passing the contaminated fluid through a filter bed comprising particulate diatomaceous earth filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 25
Independent Claim
49 words
A method for the removal of negatively charged submicron particulate contaminates from a fluid comprising passing the contaminated fluid through a filter bed comprising particulate perlite filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 26
Independent Claim
49 words
A method for the removal of negatively charged submicron particulate contaminates from a fluid comprising passing the contaminated fluid through a filter bed comprising particulate perlite filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 27
Independent Claim
49 words
A method for the removal of negatively charged submicron particular contaminates from a fluid comprising passing the contaminated fluid through a filter bed of defibered cellulose filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 28
Independent Claim
49 words
A method for the removal of negatively charged submicron particular contaminates from a fluid comprising passing the contaminated fluid through a filter bed of defibered cellulose filter aid coated with a sufficient amount of a melamine formaldehyde cationic colloid to render the anionic surface of the filter aid electro-positive.
Claim 29
Dependent Claim
24 words
The method of claim 14, 15, 16, or 17, wherein the filter aid exhibits an average particulate dimension of less than about 10 microns.
Claim 30
Dependent Claim
24 words
The method of claim 14, 15, 16, or 17, wherein the filter aid exhibits an average particulate dimension of less than about 5 microns.
Claim 31
Dependent Claim
25 words
The method of claim 14, 15, 16, or 17, wherein the filter aid exhibits a specific area in excess of one square meter per gram.
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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) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |