US4000016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble fluxes
Assignee: International Business Machines Corp
•
Filing: 1974-11-29
•
Granted: 1976-12-28
•
Expires: 1994-11-29
Abstract
Abstract Water soluble fluxing bath compositions have particular value in immersion soldering of metallic surfaces and electrical connections in that they are characterized by good thermal and chemical stability and easy removal of flux residues without corrosion or insulation resistance hazards. The compositions comprise from about 2 to 8 percent by weight of chelating agents or salts dissolved in a solvent, such as glycerol. In some instances from about 0.1 to 1.0 percent of an inorganic acid, such as hydrochloric acid may be added.
Inventors
- 👤 Donald J. Lazzarini
- 👤 Frank H. Sarnacki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:55
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
A fluxing composition comprising: from about 2 to 8 percent by weight of a chelating agent, and from about 92 to 97 percent by weight of glycerol.
Claim 2
Dependent Claim
27 words
A fluxing composition comprising: from about 2 to 8 percent by weight of a chelating agent, and from about 92 to 97 percent by weight of glycerol.
Claim 3
Dependent Claim
17 words
The composition of claim 1 further comprising from about 0.1 to 1.0 percent of an inorganic acid.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the chelate salt is disodium ethylenediaminetetraacetate.
Claim 5
Dependent Claim
13 words
The composition of claim 1 wherein the chelate salt is trisodium ethylenedinitrilo tetraacetate.
Claim 6
Dependent Claim
12 words
The composition of claim 1 wherein the chelate salt is tetrasodium ethylenediaminetetraacetate.
Claim 7
Dependent Claim
13 words
The composition of claim 1 wherein the chelate salt is pentasodium diethylenetriamine pentaacetate.
Claim 8
Dependent Claim
12 words
The composition of claim 1 wherein the chelate salt is ethylenediaminetetraacetic acid.
Claim 9
Dependent Claim
13 words
The composition of claim 2 wherein the inorganic acid is concentrated hydrochloric acid.
Claim 10
Dependent Claim
12 words
The composition of claim 2 wherein the inorganic acid is phosphoric acid.
Claim 11
Dependent Claim
12 words
The composition of claim 2 wherein the inorganic acid is sulphuric acid.
Claim 12
Dependent Claim
12 words
The composition of claim 2 wherein the inorganic acid is nitric acid.
References Cited (Backward Citations)
US2493372A
Cited
US3832242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |