US3768141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of soldering
Assignee: Ford Motor Co
•
Filing: 1972-02-22
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Granted: 1973-10-30
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Expires: 1992-02-22
Abstract
Abstract This invention relates to a soft solder containing a significant portion of silver. This solder is particularly useful in soldering together components fabricated from aluminum or aluminum based metals to components based upon more noble metals and particularly to copper or copper base alloys such as ordinary brass.
Inventors
- 👤 D Schmatz
- 👤 C Yen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:26
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3601; B23K35/3603; B23K35/24; B23K35/26; B23K35/268
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
The process recited in claim 1 in which the solder contains 3 to 5 percent tin and two to three percent silver.
Claim 2
Dependent Claim
18 words
The process recited in claim 1 in which the solder contains three percent tin and two percent silver.
Claim 3
Dependent Claim
20 words
The process recited in claim 1 in which the flux is anhydrous zinc chloride dissolved in a dry organic solvent.
Claim 4
Dependent Claim
107 words
The process of producing a heat exchange device comprising conduits normally conducting a water base coolant and an untreated aluminum or aluminum base alloy heat dissipating fins soldered to the conduits comprising fabricating the conduits from brass by soldering with a solder consisting essentially of lead, from 1 to 10 percent tin, a significant amount up to 5 percent silver and not over 0.10 percent antimony, assembling in operational relationship the soldered conduits and aluminum or aluminum base heat dissipating fins and exposing the assemblage to heat sufficiently intense and for a sufficient period of time to securely solder the fins to the tubes with said solder.
Claim 5
Dependent Claim
22 words
The process recited in claim 5 in which the solder contains 3 to 5 percent tin and two to three percent silver.
Claim 6
Dependent Claim
18 words
The process recited in claim 5 in which the solder contains 3 percent tin and 2 percent silver.
Claim 7
Dependent Claim
20 words
The process recited in claim 5 in which the flux is anhydrous zinc chloride dissolved in a dry organic solvent.
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |