Patent US4983224A successfully refreshed from Google Patents.
US4983224A
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Cleaning compositions and methods for removing soldering flux
Assignee: RBP Chemical Technology Inc
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Filing: 1988-10-28
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Granted: 1991-01-08
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Expires: 2008-10-28
Abstract
Abstract A method to remove solder flux residues from assembled or partially assembled electronic circuit boards employs a composition containing a nonpolar component consisting essentially of terpenes and/or terpenols, a polar component consisting essentially of a polar aprotic solvent or a mixture of polar aprotic solvents, and a surfactant. Use of this composition results in shorter cleaning times at lower temperatures with superior results.
Inventors
- 👤 Suzette L. Mombrun
- 👤 Rudolf P. Sedlak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/26; C; C11; C11D; C11D3/00; C11D3/16; C11D3/18; C11D3/20; C11D3/2003; C11D3/2006; C11D3/2037; C11D3/43; C23; C23G; C23G5/00; C23G5/02; C23G5/024; H05K2203/00; H05K2203/07; H05K2203/0779; H05K2203/0783
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A process for removing soldering flux residue from an assembled or partially assembled electronic circuit board, which process comprises: contacting said board with a cleaning composition which consists essentially of 25-90% terpene/terpenol; 1-10% surfactant; and 5-65% polar aprotic solvent; said composition optionally in admixture with water, for a time period effective to mobilize and detach said flux residue; and removing the cleaning composition and flux residue from contact with the circuit board.
Claim 2
Dependent Claim
72 words
A process for removing soldering flux residue from an assembled or partially assembled electronic circuit board, which process comprises: contacting said board with a cleaning composition which consists essentially of 25-90% terpene/terpenol; 1-10% surfactant; and 5-65% polar aprotic solvent; said composition optionally in admixture with water, for a time period effective to mobilize and detach said flux residue; and removing the cleaning composition and flux residue from contact with the circuit board.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the polar aprotic solvent is selected from the group consisting of N-methyl pyrrolidone, tripropylene glycol monomethyl ether, ethylene glycol monobutyl ether, DMF and DMSO.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the terpene/terpenol is selected from the group consisting of limonene, pinene, and mixtures thereof.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the surfactant is a polyethoxylated alcohol or a mixture of polyethoxylated alcohols.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein the flux residue is a residue from a rosin-based flux and the cleaning composition contains 80-90% terpene/terpenol.
Claim 7
Dependent Claim
23 words
The process of claim 1 wherein the flux residue is deposited by a synthetic water-soluble flux and the cleaning composition contains 25-50% terpene/terpenol.
References Cited (Backward Citations)
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |