US3710069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for selective solder reflow
Assignee: International Business Machines Corp
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Filing: 1970-07-06
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Granted: 1973-01-09
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Expires: 1990-07-06
Abstract
Abstract A method of selective solder reflow in which an article to be reflowed is heated for a period of time sufficient to melt the solder, and at least one solder deposit which is not to be reflowed is cooled to prevent that solder from melting. In order to reduce temperature gradients in the article, the cooling is delayed until the heating has been applied.
Inventors
- 👤 J Papadopoulos
- 👤 D Prince
- 👤 R Reilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:56
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/005; B23K1/018; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3494; H05K2203/00; H05K2203/11; H05K2203/1121; H10; H10W; H10W72/00; H10W72/071; H10W72/0711; H10W72/07141; H10W72/07152; H10W72/072; H10W72/07231; H10W72/07236
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A method of selectively reflowing solder deposits on an article comprising the steps of: heating the article to melt at least one solder deposit on the article; cooling, during at least part of the heating step, at least a second solder deposit on the article due to said heating which would melt in the absence of the cooling to prevent the second solder deposit from melting.
Claim 2
Independent Claim
66 words
A method of selectively reflowing solder deposits on an article comprising the steps of: heating the article to melt at least one solder deposit on the article; cooling, during at least part of the heating step, at least a second solder deposit on the article due to said heating which would melt in the absence of the cooling to prevent the second solder deposit from melting.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the cooling is by the flow of fluid.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the cooling is by the flow of gas.
Claim 5
Dependent Claim
19 words
The method of claim 3 wherein the cooling step is delayed until after the beginning of the heating step.
Claim 6
Dependent Claim
18 words
The method of claim 3 wherein the cooling is increased after the solder to be melted has melted.
Claim 7
Dependent Claim
68 words
Apparatus for selectively reflowing solder deposits on an article comprising: heating means for heating at least one solder deposit on said article; cooling means for cooling at least a second solder deposit on said articLe in a zone substantially affected by said heating means to prevent reflow of that solder deposit; and means for controlling the activation of the cooling means to reduce temperature gradients in the apparatus.
Claim 8
Dependent Claim
68 words
Apparatus for selectively reflowing solder deposits on an article comprising: heating means for heating at least one solder deposit on said article; cooling means for cooling at least a second solder deposit on said articLe in a zone substantially affected by said heating means to prevent reflow of that solder deposit; and means for controlling the activation of the cooling means to reduce temperature gradients in the apparatus.
Claim 9
Dependent Claim
15 words
The apparatus of claim 6 wherein the heating means is a source of radiant energy.
Claim 10
Dependent Claim
18 words
The apparatus of claim 6 wherein the article is positioned between the heating means and the cooling means.
Claim 11
Dependent Claim
16 words
The apparatus of claim 6 wherein the cooling means directs a cooling fluid onto the article.
Claim 12
Dependent Claim
31 words
The apparatus of claim 9 wherein isolation means for isolating the solder to be reflowed from the cooling fluid is disposed between the cooling means and the solder to be reflowed.
Claim 13
Dependent Claim
31 words
The apparatus of claim 10 wherein the isolation means is a portion of the article which forms a barrier to prevent the cooling gas from cooling the solder to be reflowed.
Claim 14
Dependent Claim
16 words
The apparatus of claim 6 wherein the cooling means directs a cooling gas onto the article.
Claim 15
Dependent Claim
30 words
The apparatus of claim 6 wherein the means for controlling the activation of the cooling means operates to delay the activation of the cooling means until after the heating starts.
Claim 16
Dependent Claim
42 words
The apparatus of claim 6 wherein the cooling means has at least two cooling rates, a first cooling rate being used during a first portion of the cooling step, and the second being applied during a second portion of the cooling step.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |