Patent US5489144A successfully refreshed from Google Patents.
Patent US4478650A successfully refreshed from Google Patents.
US4478650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble flux
Assignee: AT&T Inc
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Filing: 1983-10-19
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Granted: 1984-10-23
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Expires: 2003-10-19
Abstract
Abstract A rosin free, water soluble solder flux suitable for use as a fusing fluid in high temperature solder operations has been developed. The novel flux comprises a high molecular weight amine activator, at least one other activator selected from a water soluble organic acid activator and an inorganic acid activator, and a solvent mixture. The acid activators are present in an amount which essentially neutralizes the amine.
Inventors
- 👤 Frank M. Zado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:23
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612; B23K35/3615
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
32 words
A rosin free water soluble flux comprising a high molecular weight polyalkylene glycol amine activator, a water soluble acid activator in an amount which essentially neutralizes the amine and a solvent mixture.
Claim 2
Dependent Claim
32 words
A rosin free water soluble flux comprising a high molecular weight polyalkylene glycol amine activator, a water soluble acid activator in an amount which essentially neutralizes the amine and a solvent mixture.
Claim 3
Dependent Claim
31 words
The flux recited in claim 1, wherein the amine activator is a polyalkalene glycol amine and said acid activator is selected from the group consisting of organic acids and inorganic acids.
Claim 4
Dependent Claim
23 words
The flux recited in claim 2, wherein the alkalene group of the polyalkalene glycol amine is propylene or a higher molecular weight homolog.
Claim 5
Dependent Claim
29 words
The flux recited in claim 3, wherein the acid activator is selected from the group consisting of citric, tartaric, glycolic, glutaric, malonic, acetic, sulfonic, hydrochloric, sulfuric and mixtures thereof.
Claim 6
Dependent Claim
47 words
A rosin free water soluble flux comprising a polypropylene glycol amine activator, an acid activator in an amount so as to essentially neutralize said amine, said acid activator selected from the group consisting of citric, tartaric, glycolic, glutaric, malonic, acetic, sulfonic, hydrochloric, sulfuric and a solvent mixture.
Claim 7
Dependent Claim
47 words
A rosin free water soluble flux comprising a polypropylene glycol amine activator, an acid activator in an amount so as to essentially neutralize said amine, said acid activator selected from the group consisting of citric, tartaric, glycolic, glutaric, malonic, acetic, sulfonic, hydrochloric, sulfuric and a solvent mixture.
Claim 8
Dependent Claim
59 words
The flux recited in claim 1, wherein the amine activator is an aminopolyalkaline glycol present in an amount of from 5 to 45 weight percent, the acid is present in an amount of from 2 to 35 weight precent and the solvent mixture is present in an amount of from 30 to 70 weight percent of the flux composition.
Claim 9
Dependent Claim
34 words
The flux recited in claim 6 including from 0-25 weight percent of a vehicle and from 0 to 8 weight percent of an amine hydrohalide activator and wherein the pH is from about 6-7.
Claim 10
Dependent Claim
12 words
The flux recited in claim 7, wherein said vehicle is polypropylene glycol.
Claim 11
Dependent Claim
23 words
The flux recited in claim 1, wherein the solvent mixture constitutes a relatively high boiling point solvent and a lower boiling point solvent.
Claim 12
Dependent Claim
16 words
The flux recited in claim 9, wherein the solvents comprise diethylene glycol monomethylether and 2-methoxy ethanol.
Claim 13
Dependent Claim
59 words
The flux recited in claim 5, wherein the amine activator is an aminopolyalkaline glycol present in an amount of from 5 to 45 weight percent, the acid is present in an amount of from 2 to 35 weight percent and the solvent mixture is present in an amount of from 30 to 70 weight percent of the flux composition.
Claim 14
Dependent Claim
34 words
The flux recited in claim 11 including from 0-25 weight percent of a vehicle and from 0 to 8 weight percent of an amine hydrohalide activator and wherein the pH is from about 6-7.
Claim 15
Dependent Claim
12 words
The flux recited in claim 12, wherein said vehicle is polypropylene glycol.
Claim 16
Dependent Claim
23 words
The flux recited in claim 5, wherein the solvent mixture constitutes a relatively high boiling point solvent and a lower boiling point solvent.
Claim 17
Dependent Claim
16 words
The flux recited in claim 14, wherein the solvents comprise diethylene glycol monomethylether and 2-methoxy ethanol.
Claim 18
Dependent Claim
71 words
A rosin free water soluble flux comprising 5 to 45 weight percent aminopolypropylene glycol, 0-25 weight percent polypropylene glycol, 2-35 weight percent of an acid selected from the group consisting of citric, tartaric, glycolic, glutaric, malonic, acetic, sulfonic, hydrochloric, sulfuric and mixtures thereof, 0 to 8 weight percent diethylaminehydrochloride and 30-70 weight percent solvent and having a pH of from about 6 to 7 measured in an aqueous 5% flux solution.
Claim 19
Dependent Claim
71 words
A rosin free water soluble flux comprising 5 to 45 weight percent aminopolypropylene glycol, 0-25 weight percent polypropylene glycol, 2-35 weight percent of an acid selected from the group consisting of citric, tartaric, glycolic, glutaric, malonic, acetic, sulfonic, hydrochloric, sulfuric and mixtures thereof, 0 to 8 weight percent diethylaminehydrochloride and 30-70 weight percent solvent and having a pH of from about 6 to 7 measured in an aqueous 5% flux solution.
Claim 20
Dependent Claim
27 words
The flux recited in claim 16, wherein the aminopolypropylene glycol is N,N,N,N-tetraisopropylethylene diamine and wherein the solvent comprises a mixture of diethylene glycol monomethylether and 2-methoxy ethanol.
Claim 21
Dependent Claim
35 words
The flux recited in claim 1 prepared by slowly adding the acid to a heated mixture of the amine activator in a high boiling point solvent, cooling and then adding a low boiling point solvent.
Claim 22
Dependent Claim
33 words
A method of soldering a metal comprising applying to a surface a soldering flux as recited in claim 1, heating the metal to the desired soldering temperature and applying solder to the surface.
Claim 23
Dependent Claim
33 words
A method of soldering a metal comprising applying to a surface a soldering flux as recited in claim 5, heating the metal to the desired soldering temperature and applying solder to the surface.
Claim 24
Dependent Claim
33 words
A method of soldering a metal comprising applying to a surface a soldering flux as recited in claim 16, heating the metal to the desired soldering temperature and applying solder to the surface.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |