US3791886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solder flux composition
Assignee: Individual
•
Filing: 1973-04-18
•
Granted: 1974-02-12
•
Expires: 1993-04-18
Abstract
Abstract A fluxing composition suitable for soldering electrical connections and characterized by producing a bright and shiny solder joint comprising about 40 to 99 percent by weight of polypropylene glycol and 0.25 to 15 percent by weight phosphoric acid. An optional component in the fluxing composition is 0 to 50 percent by weight rosin.
Inventors
- 👤 H Goldfarb
- 👤 C Valsemakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:38
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612; B23K35/3613
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
A fluxing composition as described in claim 1 wherein the average molecular weight of said polypropylene glycol is between 700 and 1,500.
Claim 2
Dependent Claim
32 words
A fluxing composition as described in claim 1 wherein the concentration of said ortho phosphoric acid is 3 to 7 weight percent and the concentration of the rosin is 0 weight percent.
Claim 3
Dependent Claim
34 words
A fluxing composition as described in claim 1 wherein the concentration of the ortho phosphoric acid is 1 to 3 weight percent and the concentration of the rosin is 20 to 40 weight percent.
Claim 4
Dependent Claim
46 words
A fluxing composition as described in claim 1 wherein the concentration of the polypropylene glycol is 72 to 76 weight percent, the concentration of the ortho phosphoric acid is 0.5 to 2 weight percent and the concentration of the rosin is 24 to 26 weight percent.
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |