Patent US4934391A successfully refreshed from Google Patents.
US4934391A
Expired / Lapsed
US
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Dibasic esters for cleaning electronic circuits
Assignee: Petroleum Fermentations NV
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Filing: 1989-02-02
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Granted: 1990-06-19
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Expires: 2009-02-02
Abstract
Abstract Methods and compositions are provided for the removal of soldering flux, screen inks and resists from contaminated surfaces. The compositions of the invention contain dibasic acid esters in combination with an appropriate emulsifying surfactant.
Inventors
- 👤 Larry Futch
- 👤 Kevin R. Hrebenar
- 👤 Michael E. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:16
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/26; C; C11; C11D; C11D3/00; C11D3/16; C11D3/20; C11D3/2093; C23; C23G; C23G5/00; C23G5/02; C23G5/024; C23G5/032; G; G03; G03F; G03F7/00; G03F7/26; G03F7/42; G03F7/422; H05K2203/00; H05K2203/07; H05K2203/0779; H05K2203/0783
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
64 words
A method for removing rosin solder flux or resist residues from a contaminated surface, comprising (a) contacting the surface with a composition comprising at least one dibasic acid ester and from 0 to about 40% by weight of an appropriate emulsifying surfactant; allowing the contact to continue for sufficient time to solubilize the residue; and (c) removing,/the composition and solubilized residue from the surface.
Claim 2
Independent Claim
64 words
A method for removing rosin solder flux or resist residues from a contaminated surface, comprising (a) contacting the surface with a composition comprising at least one dibasic acid ester and from 0 to about 40% by weight of an appropriate emulsifying surfactant; allowing the contact to continue for sufficient time to solubilize the residue; and (c) removing,/the composition and solubilized residue from the surface.
Claim 3
Dependent Claim
20 words
A method of claim 1 wherein the surfactant is a condensation product of an alkylene oxide and a hydrophobic moiety.
Claim 4
Dependent Claim
34 words
The method of claim 1 wherein the surfactant is selected from the group consisting of ethoxylated aliphatic alcohols; ethoxylated alkyl phenols; ethoxylated amines; amides; and sulfated, sulfonated, phosphated, and carboxylated hydrophobes, and salts thereof.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the ester is an aliphatic dibasic acid ester.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein the ester is an aromatic dibasic acid ester.
Claim 7
Dependent Claim
26 words
The method of claim 5 wherein the ester group consisting of dibasic compound is selected from the esters of adipic acid, succinic acid and glutaric acid.
Claim 8
Dependent Claim
23 words
The method of claim 6 wherein the ester compound is selected from the group consisting of dimethyl adipate, dimethyl succinate and dimethyl glutarate.
Claim 9
Dependent Claim
29 words
The method of claim 6 wherein the composition comprises a mixture of more than one compound selected from the group consisting of dimethyl adipate, dimethyl succinate and dimethyl glutarate.
Claim 10
Dependent Claim
11 words
The method of claim 5 wherein the ester is diethyl phthalate.
Claim 11
Dependent Claim
18 words
The method of claim 2 wherein the surfactant comprises by weight of the composition about 0 to 10%.
Claim 12
Dependent Claim
30 words
The method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 wherein the composition also comprises a terpene.
Claim 13
Dependent Claim
12 words
The method of claim 11 wherein the terpene is limonene or dipentene.
Claim 14
Dependent Claim
39 words
The method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 wherein the contact is carried out at a temperature of from about room temperature to about 150° F.
Claim 15
Dependent Claim
23 words
The method of claim 11 wherein the contact is carried out at a temperature of from about room temperature to about 150° F.
Claim 16
Dependent Claim
23 words
The method of claim 12 wherein the contact is carried out at a temperature of from about room temperature to about 150° F.
Claim 17
Dependent Claim
26 words
The method of claim 1 wherein the compound comprises a mixture of dimethyl adipate, dimethyl succinate, and dimethyl glutarate, with an ethoxylated aliphatic alcohol as surfactant.
Claim 18
Dependent Claim
30 words
The method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 wherein the residue is rosin solder flux.
Claim 19
Dependent Claim
13 words
The method of claim 17 wherein the surface is a printed circuit board.
Claim 20
Dependent Claim
12 words
The method of claim 11 wherein the residue is rosin solder flux.
Claim 21
Dependent Claim
13 words
The method of claim 19 wherein the surface is a printed circuit board.
Claim 22
Dependent Claim
16 words
The method of claim 12 or 14 or 16 wherein the residue is rosin solder flux.
Claim 23
Dependent Claim
15 words
The method of claim 12 or 14 wherein the surface is a printed circuit board.
Claim 24
Dependent Claim
29 words
The method of claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 wherein the residue is a resist.
Claim 25
Dependent Claim
11 words
The method of claim 11 wherein the residue is a resist.
Claim 26
Dependent Claim
11 words
The method of claim 12 wherein the residue is a resist.
Claim 27
Dependent Claim
12 words
The method of claim 14 wherein the residue is rosin solder flux.
Claim 28
Dependent Claim
12 words
The method of claim 16 wherein the residue is rosin solder flux.
Claim 29
Dependent Claim
13 words
The method of claim 14 wherein the surface is a printed circuit board.
Claim 30
Dependent Claim
13 words
The method of claim 16 wherein the surface is a printed circuit board.
Claim 31
Dependent Claim
11 words
The method of claim 14 wherein the residue is a resist.
Claim 32
Dependent Claim
11 words
The method of claim 16 wherein the residue is a resist.
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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |