US4220542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter having an interior liquid displacement means
Assignee: Pall Filter Specialists Inc
•
Filing: 1979-02-23
•
Granted: 1980-09-02
•
Expires: 1999-02-23
Abstract
Abstract A filter having a housing in which a filtering medium such as a rigid screen and removable bag is located. A removable, hollow closed container is located within the filter housing inside the filtering medium. A spring is compressed between the container and the top of the filter to cause the container to be pressed into contact with the filtering medium.
Inventors
- 👤 Howard W. Morgan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:25
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/27; B01D29/88; B01D29/90; B01D29/902
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
243 words
In a filter for a liquid, said filter including a housing having a base member and a removable cap, said base member having an open top and being defined by side and bottom walls, said cap spanning said base member top, a bag-shaped reticulated filtering means carried within said housing and having portions spaced from said base member, said housing having a liquid inlet means in flow communication with the interior of said filtering means and a liquid outlet means in said base member in flow communication with said spaced filtering means portions, a removable closed container means for decreasing the volumetric interior size of said filtering means, said container means fitting within said filtering means and having parts spaced from said filtering means to define liquid flow passage means from said inlet means to said spaced filtering means portions wherein liquid in passing through said filter from said inlet means to said outlet means will flow around said container means, said filtering means including an end wall and an open top, said container means having an end wall, said cap overlying the top of said filtering means, the improvement comprising biasing means interposed between said container means and cap for urging said container means end wall against said filtering means end wall, said outlet means opening into said base member at a location below where said container means end wall is urged by said biasing means against said filtering means end wall.
Claim 2
Dependent Claim
243 words
In a filter for a liquid, said filter including a housing having a base member and a removable cap, said base member having an open top and being defined by side and bottom walls, said cap spanning said base member top, a bag-shaped reticulated filtering means carried within said housing and having portions spaced from said base member, said housing having a liquid inlet means in flow communication with the interior of said filtering means and a liquid outlet means in said base member in flow communication with said spaced filtering means portions, a removable closed container means for decreasing the volumetric interior size of said filtering means, said container means fitting within said filtering means and having parts spaced from said filtering means to define liquid flow passage means from said inlet means to said spaced filtering means portions wherein liquid in passing through said filter from said inlet means to said outlet means will flow around said container means, said filtering means including an end wall and an open top, said container means having an end wall, said cap overlying the top of said filtering means, the improvement comprising biasing means interposed between said container means and cap for urging said container means end wall against said filtering means end wall, said outlet means opening into said base member at a location below where said container means end wall is urged by said biasing means against said filtering means end wall.
Claim 3
Dependent Claim
19 words
The filter of claim 1 wherein said biasing means is a spring compressed between said container means and cap.
Claim 4
Dependent Claim
11 words
The filter of claim 2 wherein said container means is hollow.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |