Patent US3565256A successfully refreshed from Google Patents.
US3565256A
Expired / Lapsed
US
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Ultrafiltration cell
Assignee: Amicon Corp
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Filing: 1969-03-24
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Granted: 1971-02-23
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Expires: 1989-03-24
Abstract
Abstract An ultrafiltration apparatus comprising a reservoir for receiving materials to be ultrafiltered, a self-contained autocontrolling, gas-pressurizing means to pressurize said reservoir, a removable base member to allow easy filling and cleaning of the apparatus, and a free piston mounted in the reservoir forming a barrier between the pressurizing gas and material being processed and also forming a valve effective against leakage when the reservoir is being filled from the bottom.
Inventors
- 👤 Herbert H Loeffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:45
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/14; B01D61/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
Ultrafiltration apparatus comprising a reservoir having a pressurized gas inlet adjacent one end and a base member for closing said other end of said reservoir including means for supporting and sealing an ultrafiltration membrane to said other end and an outlet for material passing through said membrane, a free-acting piston mounted within said reservoir between said inlet and said base member for sliding movement to and from said inlet and base member, said piston including means forming a slidable seal against the wall of said reservoir, and means for releasably connecting said base member to said reservoir independently of the gas inlet end of said reservoir to permit material to be filtered to be placed in the reservoir between the piston and the base member, said piston being arranged to seal said material against contact with pressurized gas.
Claim 2
Dependent Claim
138 words
Ultrafiltration apparatus comprising a reservoir having a pressurized gas inlet adjacent one end and a base member for closing said other end of said reservoir including means for supporting and sealing an ultrafiltration membrane to said other end and an outlet for material passing through said membrane, a free-acting piston mounted within said reservoir between said inlet and said base member for sliding movement to and from said inlet and base member, said piston including means forming a slidable seal against the wall of said reservoir, and means for releasably connecting said base member to said reservoir independently of the gas inlet end of said reservoir to permit material to be filtered to be placed in the reservoir between the piston and the base member, said piston being arranged to seal said material against contact with pressurized gas.
Claim 3
Dependent Claim
60 words
Apparatus as claimed in claim 1 in which the means for supporting the membrane comprises a porous plate, and the releasable connecting means comprises mating screw threads on said base member and said reservoir, said apparatus including means for preventing turning of the porous plate with respect to the reservoir while said base member is being screwed onto said reservoir.
Claim 4
Dependent Claim
18 words
Apparatus as claimed in claim 2 comprising a self-contained auto-controlling gas pressurizing means connected to said gas inlet.
Claim 5
Dependent Claim
18 words
Apparatus as claimed in claim 3 comprising an ultrafiltration membrane mounted on said porous plate opposing said piston.
Claim 6
Dependent Claim
27 words
Apparatus as claimed in claim 4 in which said means for sealing said membrane to said reservoir includes an O-ring disposed around the margin of the membrane.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |