US4740247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for printed circuit board and/or printed wiring board soldermask testing
Assignee: Petroferm Inc
•
Filing: 1986-06-24
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Granted: 1988-04-26
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Expires: 2006-06-24
Abstract
Abstract Methods and compositions are provided for the removal of rosin soldering flux and adhesive tape residues from printed circuit and/or wiring boards, and for testing the quality of curing of U.V.-cured soldermask on such boards. The compositions of the invention contain terpene compounds, preferably in combination with terpene emulsifying surfactants to facilitate removal by rinsing in water.
Inventors
- 👤 Michael E. Hayes
- 👤 Craig C. Hood
- 👤 Ronald E. Miller
- 👤 Robert Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:39
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/024; C09; C09D; C09D9/00; H; H05; H05K; H05K3/00; H05K3/22; H05K3/26; H05K3/28; H05K3/288; H05K2203/00; H05K2203/07; H05K2203/0756; H05K2203/0769; H05K2203/0779; H05K2203/0783; H05K2203/16; H05K2203/162; H05K3/30; H05K3/32; H05K3/34; H05K3/3452
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
A method for detecting improperly cured U.V. soldermask on a printed wiring board, comprising (a) contacting the board with a composition comprising a terpene compound and from 0 to about 40% by weight of a terpene emulsifying surfactant; (b) allowing the contact to continue for sufficient time to visibly loosen improperly cured U.V. soldermask areas; (c) removing the composition from the board; and (d) detecting the visibly loosened improperly cured soldermask areas.
Claim 2
Independent Claim
72 words
A method for detecting improperly cured U.V. soldermask on a printed wiring board, comprising (a) contacting the board with a composition comprising a terpene compound and from 0 to about 40% by weight of a terpene emulsifying surfactant; (b) allowing the contact to continue for sufficient time to visibly loosen improperly cured U.V. soldermask areas; (c) removing the composition from the board; and (d) detecting the visibly loosened improperly cured soldermask areas.
Claim 3
Dependent Claim
52 words
The method of claim 1 wherein the terpene emulsifying surfactant is selected from the group consisting of linear alkyl benzene sulfonates, linear or branched chain alcoholic ethoxylates and ethoxysulfates, polysorbate esters, alkyl and dialkyl succinate compounds, and ethoxylated alkylphenols, which ethoxylated alkylphenols have from about 5 to about 20 ethylene oxide groups.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the terpene compound is selected from the group consisting of the d-form of limonene, the 1-form of limonene, and dipentene.
Claim 5
Dependent Claim
26 words
The method of claim 2 wherein the terpene compound is selected from the group consisting of the d-form of limonene, the 1-form of limonene, and dipentene.
Claim 6
Dependent Claim
17 words
The method of claim 3 where the terpene compound is the d-form or the 1-form of limonene.
Claim 7
Dependent Claim
11 words
The method of claim 3 wherein the terpene compound is dipentene.
Claim 8
Dependent Claim
30 words
The method of claim 5 wherein the surfactant comprises by weight of the composition about 6.5% poly (7) ethoxy nonylphenol, 2.1% poly (10) ethoxy nonylphenol and 1.4% sodium dioctyl sulfosuccinate.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the contact is carried out at a temperature of from about room temperature to about 150° F.
Claim 10
Dependent Claim
23 words
The method of claim 2 wherein the contact is carried out at a temperature of from about room temperature to about 150° F.
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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) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |