Patent US2319203A successfully refreshed from Google Patents.
Patent US4169794A successfully refreshed from Google Patents.
US4169794A
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US
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Filter
Assignee: Denver Equipment Co
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Filing: 1977-03-02
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Granted: 1979-10-02
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Expires: 1997-03-02
Abstract
Abstract A rotary filtering apparatus having improved filtrate flow conducting means.
Inventors
- 👤 Charles L. Badino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:15
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D33/23; B01D33/80; B01D33/803; B01D33/82; B01D2201/00; B01D2201/28; B01D2201/282; B01D2201/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
In a rotary filter apparatus wherein a shaft portion including fluid flow passageway means is disposed in relative rotary relation with a valve means including fluid flow passageway means in a manner to permit selective fluid flow communication therebetween during such relative rotation, the improvement comprising: at least a pair of seal members including a first seal member releasably carried by such shaft portion and a second seal member releasably carried by such valve means; respective surface portions of said first and second seal members being maintained in continuously slideable face sealing engagement to define a sealed interface therebetween; and said first and second seal members including respective aperture means communicating between said sealed interface and the respective said passageway means in such shaft portion and such valve means to permit fluid flow communication therebetween across said sealed interface by selective registering of the respective said aperture means in said first and second seal members during relative rotation therebetween.
Claim 2
Dependent Claim
159 words
In a rotary filter apparatus wherein a shaft portion including fluid flow passageway means is disposed in relative rotary relation with a valve means including fluid flow passageway means in a manner to permit selective fluid flow communication therebetween during such relative rotation, the improvement comprising: at least a pair of seal members including a first seal member releasably carried by such shaft portion and a second seal member releasably carried by such valve means; respective surface portions of said first and second seal members being maintained in continuously slideable face sealing engagement to define a sealed interface therebetween; and said first and second seal members including respective aperture means communicating between said sealed interface and the respective said passageway means in such shaft portion and such valve means to permit fluid flow communication therebetween across said sealed interface by selective registering of the respective said aperture means in said first and second seal members during relative rotation therebetween.
Claim 3
Dependent Claim
17 words
The improvement as claimed in claim 1 wherein said respective surface portions are formed from different materials.
Claim 4
Dependent Claim
26 words
The improvement as claimed in claim 2 wherein one of said materials exhibits the property of a higher innate lubricity than the other of said materials.
Claim 5
Dependent Claim
25 words
The improvement as claimed in claim 3 wherein said one material additionally exhibits the property of higher abrasion resistance than the other of said materials.
Claim 6
Dependent Claim
26 words
The improvement as claimed in claim 4 wherein said one material is from the group consisting of plastic urethanes, nylon, teflon, Bakelite, hard rubber and polyethylene.
Claim 7
Dependent Claim
44 words
The improvement as claimed in claim 4 wherein the one of said seal members having said surface portion formed of said one material is on the downstream side of said sealed interface with respect to the direction of fluid flow across said sealed interface.
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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) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |