US4640774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly of mounted tubular filter members inside an envelope
Assignee: Ceraver SA
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Filing: 1985-06-19
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Granted: 1987-02-03
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Expires: 2005-06-19
Abstract
Abstract An assembly of a tubular filter member (2) inside an envelope (5) surrounding the member includes a gasket (9) of elastomer or polymer material disposed at at least one of the ends of the filter member and of the envelope in between the outside surface of the filter member and the inside surface of the envelope. The outside surface of the filter member is provided over at least a portion of its surface area facing the gasket with roughnesses (11) or projections or hollows of sufficient size and number to prevent the filter element from sliding longitudinally relative to the gasket. Such an assembly is applicable to microfiltration, ultrafiltration and reverse osmosis.
Inventors
- 👤 Daniel Garcera
- 👤 Jacques Gillot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:26
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/061; B01D63/066; B29; B29C; B29C37/00; B29C37/0078; B29C37/0082; B29C70/00; B29C70/68; B29C70/84; B29C70/845
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
162 words
An assembly of at least one elongated tubular filter member having an outside surface, two ends, and at least one channel extending from end to end therethrough; an elongated envelope surrounding said member, the envelope having an inside surface spaced from the outside surface of the filter member; and a gasket of elastomeric or polymeric material disposed at at least one of the ends of the filter member between the outside surface of the tubular filter member and the inside surface of the envelope, the gasket contacting the filter member and the envelope over a portion of their respective lengths, wherein the improvement comprises: the outside surface of the filter member is provided, over at least a part of that portion of its length which contacts the gasket, with roughnesses, projections, or hollows of suitable size and in sufficient number to prevent the filter from sliding relative to the gasket due to differential thermal expansion of the filter member and the envelope.
Claim 2
Dependent Claim
162 words
An assembly of at least one elongated tubular filter member having an outside surface, two ends, and at least one channel extending from end to end therethrough; an elongated envelope surrounding said member, the envelope having an inside surface spaced from the outside surface of the filter member; and a gasket of elastomeric or polymeric material disposed at at least one of the ends of the filter member between the outside surface of the tubular filter member and the inside surface of the envelope, the gasket contacting the filter member and the envelope over a portion of their respective lengths, wherein the improvement comprises: the outside surface of the filter member is provided, over at least a part of that portion of its length which contacts the gasket, with roughnesses, projections, or hollows of suitable size and in sufficient number to prevent the filter from sliding relative to the gasket due to differential thermal expansion of the filter member and the envelope.
Claim 3
Dependent Claim
34 words
An assembly according to claim 1 wherein the one end of the filter member is covered with enamel or glass, and wherein the roughnesses are constituted by large grains in the enamel or glass.
Claim 4
Dependent Claim
33 words
An assembly according to claim 1 wherein an organic adhesive is deposited on the one end of the filter member, and the roughnesses are constituted by large grains dispersed in the deposited adhesive.
Claim 5
Dependent Claim
32 words
An assembly according to claim 1 wherein the one end of the filter member is covered with synthetic resin, and the roughnesses are constituted by large grains encrusted in the synthetic resin.
Claim 6
Dependent Claim
30 words
An assembly according to claim 1 wherein the roughnesses are formed by large grains projected onto the one end of the filter member in an at least partially molten state.
Claim 7
Dependent Claim
26 words
An assembly according to claim 1 wherein the roughnesses are formed by large grains deposited around the one end of the filter member and then brazed.
Claim 8
Dependent Claim
20 words
An assembly according to claim 1 wherein the one end of the filter member is abraded to form said roughnesses.
Claim 9
Dependent Claim
22 words
An assembly according to claim 1 wherein the projections are constituted by spaced apart local excess thicknesses of the tubular filter member.
Claim 10
Dependent Claim
35 words
An assembly according to claim 1 wherein the projections are constituted by spaced apart circumferential excess thicknesses, and these thicknesses are constituted by tapes of material wound around the one end of the filter member.
Claim 11
Dependent Claim
22 words
An assembly according to claim 1 wherein the hollows comprise spaced apart local indentations around the one end of the filter member.
References Cited (Backward Citations)
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US3834545A
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US4021350A
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US4587016A
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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) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |