US5007969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low toxicity liquid solvent
Assignee: Boeing Co
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Filing: 1988-05-20
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Granted: 1991-04-16
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Expires: 2008-05-20
Abstract
Abstract Liquid solvent mixtures having superior cleaning power, especially for photoresist and fingernail enamel, include polar compounds, such as ethylene diacetate, and alicyclic carbonates, such as ethylene carbonate. The solvent mixtures exhibit a low toxicity and have chemical and physical properties that reduce the risk of exposing the user to other unnecessary hazardous conditions.
Inventors
- 👤 Patrisha A. Doscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:30
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/032; C09; C09D; C09D9/00; C09D9/005; C11; C11D; C11D7/00; C11D7/50; C11D7/5004; C11D7/5022; G; G03; G03F; G03F7/00; G03F7/26; G03F7/42; G03F7/422; C11D7/22; C11D7/26; C11D7/263; C11D7/266
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A low toxicity solvent comprising 40-95 vol % ethylene diacetate and the remainder an alicyclic carbonate including an effective amount of ethylene carbonate, the solvent being aprotic and having a vapor pressure less than or equal to 1 mm Hg at 20° C.
Claim 2
Dependent Claim
43 words
A low toxicity solvent comprising 40-95 vol % ethylene diacetate and the remainder an alicyclic carbonate including an effective amount of ethylene carbonate, the solvent being aprotic and having a vapor pressure less than or equal to 1 mm Hg at 20° C.
Claim 3
Dependent Claim
19 words
The solvent of claim 1 wherein the alicyclic carbonate compound is a mixture of ethylene carbonate and propylene carbonate.
Claim 4
Dependent Claim
13 words
The solvent of claim 1 wherein the alicyclic carbonate is only ethylene carbonate.
Claim 5
Dependent Claim
9 words
The solvent of claim 1 comprising 45-75% ethylene diacetate.
Claim 6
Dependent Claim
11 words
The solvent of claim 1 comprising 45-55 vol. % ethylene diacetate.
Claim 7
Dependent Claim
27 words
A method of removing a residue from a solid substrate comprising the step of contacting the residue with an effective amount of the solvent of claim 1.
Claim 8
Dependent Claim
25 words
A method for removing photoresist from a substrate comprising the step of contacting the photoresist with an effective amount of the solvent of claim 1.
Claim 9
Dependent Claim
26 words
A method for removing fingernail enamel from a substrate comprising the step of contacting the enamel with an effective amount of the solvent of claim 1.
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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) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |