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US3985587A
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Phosphoric acid soldering flux
Assignee: Allegheny Ludlum Corp
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Filing: 1974-12-23
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Granted: 1976-10-12
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Expires: 1994-12-23
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, stainless steel 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, copper containing material 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
2026-10-29 19:27
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612; B23K35/3613; B23K35/3601; B23K35/3611
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
97 words
A viscous fluid suitable for use as a soldering flux; said fluid consisting essentially of, in weight percent, 25 to 80% phosphoric acid (based on a concentration of 75 to 95%), 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, from 0.1 to 15% of copper containing material, from 0 to 40% of ammonium salt, and from 0 to 30% water; said organic material having a molecular weight between 4,000 and 20,000.
Claim 2
Dependent Claim
97 words
A viscous fluid suitable for use as a soldering flux; said fluid consisting essentially of, in weight percent, 25 to 80% phosphoric acid (based on a concentration of 75 to 95%), 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, from 0.1 to 15% of copper containing material, from 0 to 40% of ammonium salt, and from 0 to 30% water; said organic material having a molecular weight between 4,000 and 20,000.
Claim 3
Dependent Claim
39 words
A viscous fluid according to claim 1, having 30 to 75% phosphoric acid, 20 to 60% organic material, from 0.5 to 10% of copper containing material, from 0 to 33% of ammonium salt, and from 0 to 20% water.
Claim 4
Dependent Claim
15 words
A viscous fluid according to claim 2, having from 15 to 25% of ammonium salt.
Claim 5
Dependent Claim
19 words
A viscous fluid according to claim 1, wherein said organic material has a molecular weight between 6,000 and 10,000.
Claim 6
Dependent Claim
25 words
A viscous fluid according to claim 1, wherein said organic material is from the group consisting of polyethylene glycol, polypropylene glycol, methyl cellulose and polyethyleneimine.
Claim 7
Dependent Claim
14 words
A viscous material according to claim 5, wherein said organic material is polyethylene glycol.
Claim 8
Dependent Claim
24 words
A viscous fluid according to claim 1, wherein said copper containing material is from the group consisting of copper, copper alloys and copper salts.
Claim 9
Dependent Claim
16 words
A viscous fluid according to claim 7, wherein said copper containing material is basic copper carbonate.
Claim 10
Dependent Claim
107 words
A soldering flux consisting essentially of a viscous fluid and from 30 to 70%, by weight, of pasty vehicle; said viscous fluid consisting essentially of, in weight percent, 25 to 80% phosphoric acid (based on a concentration of 75 to 95%), 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, from 0.1 to 15% of copper containing material, from 0 to 40% of ammonium salt, and from 0 to 30% water; said organic material having a molecular weight between 4,000 and 20,000.
Claim 11
Dependent Claim
107 words
A soldering flux consisting essentially of a viscous fluid and from 30 to 70%, by weight, of pasty vehicle; said viscous fluid consisting essentially of, in weight percent, 25 to 80% phosphoric acid (based on a concentration of 75 to 95%), 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, from 0.1 to 15% of copper containing material, from 0 to 40% of ammonium salt, and from 0 to 30% water; said organic material having a molecular weight between 4,000 and 20,000.
Claim 12
Dependent Claim
43 words
A soldering flux according to claim 9, wherein said viscous fluid has 30 to 75% phosphoric acid, 20 to 60% organic material, from 0.5 to 10% of copper containing material, from 0 to 33% of ammonium salt, and from 0 to 20% water.
Claim 13
Dependent Claim
19 words
A soldering flux according to claim 10, wherein said viscous fluid has from 15 to 25% of ammonium salt.
Claim 14
Dependent Claim
19 words
A soldering flux according to claim 9, wherein said organic material has a molecular weight between 6,000 and 10,000.
Claim 15
Dependent Claim
25 words
A soldering flux according to claim 9, wherein said organic material is from the group consisting of polyethylene glycol, polypropylene glycol, methyl cellulose and polyethyleneimine.
Claim 16
Dependent Claim
14 words
A soldering flux according to claim 13, wherein said organic material is polyethylene gylcol.
Claim 17
Dependent Claim
24 words
A soldering flux according to claim 9, wherein said copper containing material is from the group consisting of copper, copper alloys and copper salts.
Claim 18
Dependent Claim
16 words
A soldering flux according to claim 15, wherein said copper containing material is basic copper carbonate.
Claim 19
Dependent Claim
13 words
A soldering flux according to claim 9, wherein said pasty vehicle is petrolatum.
Claim 20
Dependent Claim
15 words
A soldering flux according to claim 9, having from 33 to 40% of pasty vehicle.
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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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |