US3986899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atomized copper brazing paste
Assignee: SCM Metal Products Inc
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Filing: 1974-06-07
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Granted: 1976-10-19
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Expires: 1994-06-07
Abstract
Abstract A residue-free brazing composition for brazing together metal parts is based on atomized copper particles dispersed in a fugitive binder to produce brazing paste.
Inventors
- 👤 Glen D. Kole
- 👤 Paul D. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:38
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/302; B23K35/02; B23K35/0222; B23K35/0244; B23K35/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
A residue-free copper brazing paste comprising copper particles dispersed in a fugitive binder, the improvement comprising: said copper particles being atomized elemental copper having a particle size between about 5 to 177 microns and being substantially free of non-reducible oxide particles, said particles containing less than 0.1% by weight of non-reducible oxide wherein said impurities are confined to the surface of said copper particles.
Claim 2
Dependent Claim
64 words
A residue-free copper brazing paste comprising copper particles dispersed in a fugitive binder, the improvement comprising: said copper particles being atomized elemental copper having a particle size between about 5 to 177 microns and being substantially free of non-reducible oxide particles, said particles containing less than 0.1% by weight of non-reducible oxide wherein said impurities are confined to the surface of said copper particles.
Claim 3
Dependent Claim
19 words
The copper brazing paste in claim 1 wherein the non-reducible oxide impurities are less than about 0.05% by weight.
Claim 4
Dependent Claim
21 words
The copper brazing paste set forth in claim 1 wherein the copper particles are substantially spherical and are water-atomized copper particles.
Claim 5
Dependent Claim
14 words
The copper brazing paste in claim 1 wherein the copper particles are copper alloy.
Claim 6
Dependent Claim
34 words
The copper brazing paste in claim 1 wherein the copper particles are combined with at least about 0.5% by weight iron particles having a particle size less than the particle size of the copper.
Claim 7
Dependent Claim
18 words
The copper brazing paste in claim 5 wherein the iron particle size is less than about 10 microns.
Claim 8
Dependent Claim
14 words
the copper brazing paste in claim 5 wherein the iron powder is carbonyl iron.
Claim 9
Dependent Claim
22 words
The copper brazing paste in claim 5 wherein the metal mixture comprises between about 1% to 14% by weight of said iron.
Claim 10
Dependent Claim
39 words
The copper brazing paste in claim 1 containing at least about 0.5% by weight metal powder selected from iron, copper-tin alloy, and nickel, and said metal powder has a particle size less than the particle size of said copper.
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |