US4114794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of autogenously bonding filter assemblies
Assignee: Pall Filtration and Separations Group Inc
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Filing: 1977-01-10
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Granted: 1978-09-19
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Expires: 1997-01-10
Abstract
Abstract An autogenous or sinter bond between metallic filter media and other metal components of a filter assembly is produced by joining the parts through a diffusion bonding membrane. The membrane comprises a web of small diameter metal fibrils which will sinter bond to both the filter media and the other filter parts to form a physically strong and leak-free seal.
Inventors
- 👤 Ronald L. Storms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:41
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D29/00; B01D29/01; B01D29/012; B01D29/05; B01D29/07; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2041; B01D39/2044; B01D46/10; B01D46/24; B01D2265/00; B01D2265/04; B01D2271/00; B01D2271/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A method of joining porous metallic filter media and a metal filter housing to form a filter assembly which comprises the steps of: forming a diffusion bonding porous membrane, said membrane comprising a web of small diameter fibrils having metallurgical compatibility with both the filter media and the housing; placing said porous membrane between and in contact with the filter media and housing to form an assembly; and sintering said assembly at a temperature below the melting point of the membrane, filter media and housing and for a time sufficient to form a strong, leak-free autogenous bond between the filter media and the housing.
Claim 2
Independent Claim
104 words
A method of joining porous metallic filter media and a metal filter housing to form a filter assembly which comprises the steps of: forming a diffusion bonding porous membrane, said membrane comprising a web of small diameter fibrils having metallurgical compatibility with both the filter media and the housing; placing said porous membrane between and in contact with the filter media and housing to form an assembly; and sintering said assembly at a temperature below the melting point of the membrane, filter media and housing and for a time sufficient to form a strong, leak-free autogenous bond between the filter media and the housing.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said metal fibrils have a diameter in the range of 2 to 40 microns and a length in the range of 1/2 to 6 inches.
Claim 4
Dependent Claim
29 words
The method of claim 2 wherein said membrane has a density in the range of 5 to 40% based on the density of an equivalent volume of solid metal.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein said membrane has a thickness in the range of 0.005 to 0.05 inches.
Claim 6
Dependent Claim
33 words
The method of claim 4 wherein the composition of said metal fibrils is selected from the group consisting of the stainless steels, Inconel, Hastalloy, nickel-base super alloys and iron, cobalt and nickel-base alloys.
Claim 7
Dependent Claim
15 words
The method of claim 4 wherein said filter media comprises a sintered metal fibril web.
Claim 8
Dependent Claim
21 words
The method of claim 6 wherein said bonding membrane, said filter media and said housing are fabricated of the same metal.
Claim 9
Dependent Claim
11 words
The method of claim 7 wherein said metal is stainless steel.
Claim 10
Dependent Claim
34 words
The method of claim 8 wherein said sintering is performed under vacuum for a time in the range of 1 to 3 hours at a temperature in the range of 2000° to 2200° F.
Claim 11
Dependent Claim
46 words
The method of claim 9 wherein said metal fibrils have a diameter in the range of 4 to 16 microns and wherein the density of said membrane is in the range of 15 to 25% based on the density of an equivalent volume of solid metal.
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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |