US4541876A
Expired / Lapsed
US
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Nonaqueous powdered metal paste composition
Assignee: SCM Metal Products Inc
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Filing: 1984-09-11
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Granted: 1985-09-17
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Expires: 2004-09-11
Abstract
Abstract There is provided a nonaqueous powdered metal paste composition and a vehicle therefor, characterized by resistance to slumping upon heating to the fusion point of the metal, fusion point being above 500° C., including the powdered metal, and an organic material having a surface tension of from 43 to 65 or higher dynes/cm. at 20° C.
Inventors
- 👤 Jennie S. Hwang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:39
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
A nonaqueous powdered metal paste characterized by resistance to slumping during heating to the fusion point of the metal moiety of the paste comprising from 60 to 90 parts by weight of a powdered metal, powdered metal alloy or a blend of powdered metals having a melting point above 500° C. and having a particle size less than 20 mesh (U.S. Standard Sieve Size) and from 0 to 39 parts by weight of a natural or synthetic hydrocarbon having a melting point above 15° C. and below the fusion point of the metal or metal alloy powder, and from 0.5 to 40 parts by weight of a nonaqueous organic liquid compound having a surface tension of from 43 to 65 or higher dynes/cm. at 20° C.
Claim 2
Dependent Claim
126 words
A nonaqueous powdered metal paste characterized by resistance to slumping during heating to the fusion point of the metal moiety of the paste comprising from 60 to 90 parts by weight of a powdered metal, powdered metal alloy or a blend of powdered metals having a melting point above 500° C. and having a particle size less than 20 mesh (U.S. Standard Sieve Size) and from 0 to 39 parts by weight of a natural or synthetic hydrocarbon having a melting point above 15° C. and below the fusion point of the metal or metal alloy powder, and from 0.5 to 40 parts by weight of a nonaqueous organic liquid compound having a surface tension of from 43 to 65 or higher dynes/cm. at 20° C.
Claim 3
Dependent Claim
21 words
A nonaqueous powdered metal paste as defined in claim 1 wherein the nonaqueous organic liquid compound is a polyhydric organic compound.
Claim 4
Dependent Claim
17 words
A nonaqueous paste as defined in claim 2 wherein the polyhydric organic compounds is a polyhydric alcohol.
Claim 5
Dependent Claim
19 words
A nonaqueous paste as defined in claim 2 wherein the polyhydric organic compound is selected from diethanolamine and triethanolamine.
Claim 6
Dependent Claim
19 words
A nonaqueous paste as defined in claim 2 additionally characterized by the presence therein of an alkali metal hydroxide.
Claim 7
Dependent Claim
19 words
A nonaqueous paste as defined in claim 3 additionally characterized by the presence therein of an alkali metal hydroxide.
Claim 8
Dependent Claim
16 words
A nonaqueous paste as defined in claim 5 wherein the alkali metal hydroxide is sodium hydroxide.
Claim 9
Dependent Claim
14 words
A nonaqueous paste as defined in claim 6 wherein the polyhydric alcohol is glycerine.
Claim 10
Dependent Claim
15 words
A nonaqueous paste as defined in claim 5 wherein the polyhdric organic compound is glycerine.
Claim 11
Dependent Claim
22 words
A nonaqueous paste as defined in claim 1 wherein the powdered metal paste is a brazing paste and the metal is copper.
Claim 12
Dependent Claim
16 words
A nonaqueous paste as defined in claim 1 wherein the metal alloy is a copper alloy.
Claim 13
Dependent Claim
15 words
A nonaqueous paste as defined in claim 11 wherein the copper alloy is copper/silver alloy.
Claim 14
Dependent Claim
15 words
A nonaqueous paste as defined in claim 11 wherein the copper alloy is copper/iron alloy.
Claim 15
Dependent Claim
22 words
A nonaqueous paste as defined in claim 1 wherein the powdered metal blend is a mixture of copper powder and tin powder.
Claim 16
Dependent Claim
18 words
A nonaqueous paste as defined in claim 1 wherein the metal alloy is a hard facing nickel alloy.
Claim 17
Dependent Claim
13 words
A nonaqueous paste as defined in claim 1 wherein the hydrocarbon is petrolatum.
Claim 18
Dependent Claim
16 words
A nonaqueous paste as defined in claim 1 wherein the hydrocarbon is a hydrogenated hydrocarbon polymer.
Claim 19
Dependent Claim
18 words
A nonaqueous paste as defined in claim 1 also containing a metal oxide or a ceramic forming powder.
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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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |