Patent US3768661A successfully refreshed from Google Patents.
US3768661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter seal
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-12-28
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Granted: 1973-10-30
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Expires: 1990-12-28
Abstract
Abstract A sintered metal filter plate in, for example, a melt extrusion apparatus is sealed to its supporting structure by means of a ring of material surrounding the edge of the plate and fitted into an annular space defined between the plate and the supporting structure, the ring having a greater thermal coefficient of expansion than the supporting structure and being constructed of, for example, aluminum or polytetrafluroethylene.
Inventors
- 👤 R Coates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:05
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/01; B01D29/03; B01D29/05; B29; B29C; B29C48/00; B29C48/25; B29C48/254; B29C48/03
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
158 words
A method of forming a pressure tight seal at an elevated temperature between a filter of sintered particles and a rigid surrounding wall spaced from said filter so as to leave an annular gap, wherein on assembly a preformed body of material of melting point in excess of the working temperature of said filter, of thermal coefficient of expansion in excess of that of the material of said surrounding wall and of plasticity sufficient at the working temperature to allow the conformation of the surface of said body of material to irregularities of contacting surfaces towards which it iS urged with production of good sealing and yet not sufficiently plastic at the working temperature to allow significant flow through the pores of said filter, and of size and shape substantially to occupy the whole of the volume of said annular gap, is inserted into said annular gap and thereafter the filter assembly is raised to the working temperature.
Claim 2
Dependent Claim
14 words
An apparatus according to claim 1 wherein said continuous body of material is polytetrafluoroethylene.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1 wherein said rigid surrounding means is of metal.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 4 wherein the metal is selected from the group consisting of stainless steel, iron, bronze or copper.
Claim 5
Dependent Claim
33 words
An apparatus according to claim 1 wherein said continuous body of material is aluminium, and said rigid surrounding means is of a metal of thermal coefficient of expansion less than that of aluminium.
Claim 6
Dependent Claim
24 words
An apparatus according to claim 6 wherein said rigid surrounding means is selected from the group consisting of stainless steel, iron, bronze or copper.
Claim 7
Dependent Claim
21 words
An apparatus according to claim 1 wherein said filter is selected from the group consisting of stainless steel, cupra-nickel or bronze.
Claim 8
Dependent Claim
20 words
A method of forming a pressure tight seal according to claim 2 wherein said continuous body of material is polytetrafluoroethylene.
Claim 9
Dependent Claim
20 words
A method of forming a pressure tight seal according to claim 2 wherein said rigid surrounding means is of metal.
Claim 10
Dependent Claim
28 words
A method of forming a pressure tight seal according to claim 2 wherein said metal is selected from the group consisting of stainless steel, iron, bronze or copper.
Claim 11
Dependent Claim
20 words
A method of forming a pressure tight seal according to claim 2 wherein said continuous body of material is aluminium.
Claim 12
Dependent Claim
30 words
A method of forming a pressure tight seal according to claim 2 wherein said rigid surrounding means is selected from the group consisting of stainless steel, iron, bronze or copper.
Claim 13
Dependent Claim
27 words
A method of forming a pressure tight seal according to claim 2 wherein said filter is selected from the group consisting of stainless steel, cupronickel or bronze.
Claim 14
Dependent Claim
192 words
Apparatus for filtering a liquid at elevated temperature comprising: a filter of sintered particles having a feed surface, a discharge surface and an edge extending between the feed surface and the discharge surface; restraining means contacting a proportion of the discharge surface for restraining the filter from movement in the direction of flow of the liquid; rigid body means surrounding and spaced from the edge of the filter to define an annular space which is coextensive with said edge; an annular sealing member wholly occupying said annular space and having end faces compressed between corresponding surfaces on the body means, said sealing member being constructed of material of melting point in excess of the temperature of that of the liquid, of thermal coefficient of expansion in excess of that of the material of said body means and of plasticity sufficient at the temperature of said liquid to allow the conformation of the surface of said sealing member to irregularities of contacting surfaces towards which the material of said sealing member is urged with production of good sealing and yet not sufficiently plastic to allow significant flow through the pores of the filter.
References Cited (Backward Citations)
US2803851A
Cited
US2971219A
Cited
US3015504A
Cited
US3149845A
Cited
US3295161A
Cited
US3479692A
Cited
US3600045A
Cited
US3570059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |