US4021354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure filter
Assignee: Bristol Myers Co
•
Filing: 1975-10-31
•
Granted: 1977-05-03
•
Expires: 1995-10-31
Abstract
Abstract A filter for use with sterile slurries or the like comprises a filter basket and means for suspending the filter basket inside a housing, the suspending means for the basket including a sealing O-ring. The O-ring is disposed so that it never comes into contact with the slurry and serves to seal off the space above the basket from the space below the basket so that positive pressure or a vacuum may be used to assist the filtration process. The bottom of the filter basket forms a filter plate and means are provided for supporting the bottom surface of the filter plate. This supporting means includes a distribution plate which is attached to the basket and which has a plurality of inverted T shaped ribs attached to its lower surface.
Inventors
- 👤 Robert Lyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:05
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/05; B01D29/055
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
231 words
A filter assembly for use in filtering a slurry, said filter assembly comprising: a cylindrical housing, said housing including a removable cover, a downwardly extending wall, a base, and means for supplying unfiltered slurry to and for removing filtered slurry from said filter assembly; a filter basket supported within said housing, said filter basket including tapered imperforate side walls and a top support flange extending outwardly from an upper portion of said side walls, a support shoulder extending inwardly from said housing wall below said cover, and a resilient O-ring carried in a groove in said support shoulder, said top support flange engaging said support shoulder to support said filter basket within said housing with said O-ring providing a hermetic seal between said filter basket and said housing; and a filter plate assembly forming a bottom portion of said filter basket, said filter plate assembly including a perforated distribution plate provided with reinforcing ribs attached to the bottom surface of said distribution plate and exterior of said filter basket, a bottom support flange carried at a lower, exterior portion of said filter basket side walls, said distribution plate being secured to said bottom support flange, a support screen carried by said distribution plate within said side walls of said filter basket, and a filter plate of sintered material carried by said support screen within said side walls of said filter basket.
Claim 2
Dependent Claim
231 words
A filter assembly for use in filtering a slurry, said filter assembly comprising: a cylindrical housing, said housing including a removable cover, a downwardly extending wall, a base, and means for supplying unfiltered slurry to and for removing filtered slurry from said filter assembly; a filter basket supported within said housing, said filter basket including tapered imperforate side walls and a top support flange extending outwardly from an upper portion of said side walls, a support shoulder extending inwardly from said housing wall below said cover, and a resilient O-ring carried in a groove in said support shoulder, said top support flange engaging said support shoulder to support said filter basket within said housing with said O-ring providing a hermetic seal between said filter basket and said housing; and a filter plate assembly forming a bottom portion of said filter basket, said filter plate assembly including a perforated distribution plate provided with reinforcing ribs attached to the bottom surface of said distribution plate and exterior of said filter basket, a bottom support flange carried at a lower, exterior portion of said filter basket side walls, said distribution plate being secured to said bottom support flange, a support screen carried by said distribution plate within said side walls of said filter basket, and a filter plate of sintered material carried by said support screen within said side walls of said filter basket.
Claim 3
Dependent Claim
15 words
The filter of claim 1, wherein said filter plate is a sintered stainless steel material.
Claim 4
Dependent Claim
42 words
The filter of claim 1, wherein each said rib includes a vertically extending flange attached at its upper end to the bottom surface of said distribution plate and a horizontally extending flange attached to the lower end of said vertically extending flange.
References Cited (Backward Citations)
US1312041A
Cited
US2562735A
Cited
US2603356A
Cited
US626991A
Cited
US1652173A
Cited
US2174265A
Cited
US2584206A
Cited
US2600150A
Cited
US2872044A
Cited
US3045826A
Cited
US2946446A
Cited
US2995253A
Cited
US3295685A
Cited
US3394815A
Cited
US3448859A
Cited
US3542204A
Cited
US3560377A
Cited
US3640392A
Cited
US3700110A
Cited
US3828527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |