US3674146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regenerating filter aids
Assignee: Chemap AG
•
Filing: 1970-07-02
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Granted: 1972-07-04
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Expires: 1990-07-02
Abstract
Abstract Spent particular alluvial filter aid is separated from entrapped impurities by wet classification, and subsequently gravitational segregation of the separated particles of filter aid is effected in a streaming liquid into two fractions one of which contains finer particles and the other of which contains coarser particles.
Inventors
- 👤 Anton Hoegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:33
CPC Classifications
B; B01; B01D; B01D41/00; B01D41/02; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/261; B01J20/28; B01J20/28002; B01J20/28004; B01J20/30; B01J20/34; B01J20/3425; B01J20/345; B01J20/3475; D; D01; D01D; D01D1/00; D01D1/10; D01D1/106; D01F; D01F13/00; D01F13/02; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
17 words
A method as defined in claim 1, wherein said particle sizes range between 15 and 200 microns.
Claim 2
Dependent Claim
78 words
A method as defined in claim 1, wherein the step of gravitationally segregating said particles comprises confining a body of liquid in a receptacle, introducing a stream of liquid and of said separated particles into said body of liquid in tangential direction whereupon the coarser particles of said other fraction settle downwardly in said liquid, and separately withdrawing said one fraction in the upper region and said other fraction in the lower region of Said body of liquid.
Claim 3
Dependent Claim
39 words
A method as defined in claim 3, wherein the step of introducing said stream into said body of liquid comprises pumping said stream into said receptacle via a variable-output pump so as to permit regulation of said flow speed.
Claim 4
Dependent Claim
37 words
A method as defined in claim 1; wherein the step of gravitationally segregating said particles comprises varying the flow speed of said streaming liquid to thereby concomitantly vary the size distribution of particles in the respective fractions.
Claim 5
Dependent Claim
36 words
A method as defined in claim 1, wherein the step of separating the spent filter aid from entrapped impurities comprises effecting separation of such impurities from a filter aid composed granulate of a synthetic plastic material.
Claim 6
Dependent Claim
33 words
A method as defined in claim 1, wherein the step of separating the spent filter aid from entrapped impurities comprises effecting separation of such impurities from a filter aid composed of particulate polyvinylchloride.
Claim 7
Dependent Claim
53 words
A method as defined in claim 2, wherein the step of gravitationally segregating said particles comprises varying the flow speed of said streaming liquid to concomitantly vary the size distribution of particles in said one fraction between 15 and 100 microns, and of particles in said other fraction between 80 and 200 microns.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |