US3945554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic soldering process
Assignee: Fedders Corp
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Filing: 1975-06-12
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Granted: 1976-03-23
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Expires: 1995-06-12
Abstract
Abstract A series of thin-walled, heat exchange tubes are soldered to return bends of similar materials so as to complete a flow path through the tube bundle by a process which comprises press-fitting the return bends to the tubes, preheating the return bends and portions of the tube adjacent the bends to a temperature, the average of which is approximately the soldering temperature, soaking the preheated portion in a liquid which will equalize the temperature of the various preheated portions, and ultrasonically soldering the return bends to the tubes.
Inventors
- 👤 Charles Louis Osterkorn
- 👤 Salvatore M. Marino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:30
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/06; B23K1/0008; B23K1/0012
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
A process for ultrasonically soldering thin-wall metal tube bundles consisting of straight tubular sections and return tubular sections, the method comprising: a. fitting said return bends to said straight tubes; b. preheating the return bends and adjacent portions of the straight tubes to an average temperature approximating the temperature to be employed in ultrasonic soldering; c. soaking said preheated tube bundle portion in a heat transfer liquid so as to equalize the temperature of said portion; and d. ultrasonically soldering said return bends to said straight tube sections.
Claim 2
Dependent Claim
88 words
A process for ultrasonically soldering thin-wall metal tube bundles consisting of straight tubular sections and return tubular sections, the method comprising: a. fitting said return bends to said straight tubes; b. preheating the return bends and adjacent portions of the straight tubes to an average temperature approximating the temperature to be employed in ultrasonic soldering; c. soaking said preheated tube bundle portion in a heat transfer liquid so as to equalize the temperature of said portion; and d. ultrasonically soldering said return bends to said straight tube sections.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the ultrasonic soldering temperature is from 775° to 850°F.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein the ultrasonic soldering temperature is from 780° to 800°F.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the variations of temperature in the preheating step are from 700° to 900°F.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the preheating step is carried out with flame heat.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the heat transfer liquid is a zinc-aluminum alloy.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |