US4060191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of soldering with phosphoric acid soldering flux
Assignee: Allegheny Ludlum Corp
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Filing: 1976-06-25
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Granted: 1977-11-29
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Expires: 1996-06-25
Abstract
Abstract A phosphoric acid flux with good fluxing efficiency and high viscosity, and one which is especially suitable for use in the soldering of copper and copper-plated stainless steel. The flux is in the form of a viscous fluid, or a thermally unstable emulsion when the fluid is combined with a pasty vehicle. The viscous fluid contains phosphoric acid and an organic material (molecular weight between 4,000 and 20,000) from the group consisting of polyethers and polyimines or mixtures thereof having an atomic ratio of carbon to ether oxygen plus imine nitrogen between 1.5 and 3.1.
Inventors
- 👤 Edward G. Choby, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:04
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612; B23K35/3613; B23K35/3601; B23K35/3611
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
In the soldering of copper and copper-plated stainless steel wherein metal selected from the group consisting of copper and copper-plated stainless steel is placed in close proximity with other metal, solder and soldering flux, and wherein said solder is melted and applied to said metals in such a way that it solidifies and effects a bond therebetween; the improvement which comprises utilizing a soldering flux comprised of a viscous fluid; said fluid consisting essentially of, in weight percent, 35 to 85% phosphoric acid, 15 to 65% of organic material selected from the group consisting of polyethers and polyimines and mixtures thereof having an atomic ratio of carbon to ether oxygen plus imine nitrogen between 1.5 and 3.1, and from 0 to 30% water; and organic material having a molecular weight between 4,000 and 20,000.
Claim 2
Dependent Claim
134 words
In the soldering of copper and copper-plated stainless steel wherein metal selected from the group consisting of copper and copper-plated stainless steel is placed in close proximity with other metal, solder and soldering flux, and wherein said solder is melted and applied to said metals in such a way that it solidifies and effects a bond therebetween; the improvement which comprises utilizing a soldering flux comprised of a viscous fluid; said fluid consisting essentially of, in weight percent, 35 to 85% phosphoric acid, 15 to 65% of organic material selected from the group consisting of polyethers and polyimines and mixtures thereof having an atomic ratio of carbon to ether oxygen plus imine nitrogen between 1.5 and 3.1, and from 0 to 30% water; and organic material having a molecular weight between 4,000 and 20,000.
Claim 3
Dependent Claim
26 words
An improvement according to claim 1, wherein said viscous fluid has 40 to 80% phosphoric acid, 20 to 60% organic material, and 0 to 20% water.
Claim 4
Dependent Claim
18 words
An improvement according to claim 1, wherein said organic material has a molecular weight between 6,000 and 10,000.
Claim 5
Dependent Claim
24 words
An improvement according to claim 1, wherein said organic material is from the group consisting of polyethylene glycol, polypropylene glycol, methyl cellulose and polyethyleneimine.
Claim 6
Dependent Claim
13 words
An improvement according to claim 4, wherein said organic material is polyethylene glycol.
Claim 7
Dependent Claim
25 words
An improvement according to claim 1, wherein said flux consists essentially of said viscous fluid and from 30 to 70%, by weight, of pasty vechicle.
Claim 8
Dependent Claim
12 words
An improvement according to claim 6, wherein said pasty vehicle is petrolatum.
Claim 9
Dependent Claim
18 words
An improvement according to claim 6 wherein said flux has from 33 to 40% of said pasty vehicle.
References Cited (Backward Citations)
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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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |