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US5073291A
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Novel azeotrope-type solvent mixture of methanol and 1,4-dihydroperfluorobutane and process for cleaning electronic components with the aid of the same
Assignee: Solvay SA
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Filing: 1991-01-23
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Granted: 1991-12-17
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Expires: 2011-01-23
Abstract
Abstract The invention relates to an azeotrope-type mixture which contains about 3-5% by weight of methanol and about 95-97% by weight of 1,4-dihydroperfluorobutane, and also to a process for cleaning electronic components, in particular soldered conductor boards or printed circuits, with the aid of said mixture.
Inventors
- 👤 Horst Robeck
- 👤 Hans-Matthias Deger
- 👤 Klaus Raab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:17
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02803
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
An azeotrope-type solvent mixture which contains about 3-5% by weight of methanol and 95-97% by weight of 1,4-dihydroperfluorobutane
Claim 2
Dependent Claim
18 words
An azeotrope-type solvent mixture which contains about 3-5% by weight of methanol and 95-97% by weight of 1,4-dihydroperfluorobutane
Claim 3
Dependent Claim
49 words
An azeotrope-type mixture as claimed in claim 1, which contains about 3.2-4.0% by weight of methanol and about 96.0-96.8% by weight of 1,4-dihydroperfluorobutane, said mixture having a boiling point at 1 bar of about 40.5° C. and wherein the composition of said mixture does not substantially change upon evaporation.
Claim 4
Dependent Claim
22 words
An azeotrope-type mixture as claimed in claim 1, which contains about 3.4-3.6% by weight of methanol and 96.4-96.6% by weight of 1,4-dihydroperfluorobutane.
Claim 5
Dependent Claim
20 words
A process for cleaning electronic components, which comprises washing the components with an azeotrope-type mixture as claimed in claim 1.
Claim 6
Dependent Claim
22 words
A process for removing soldering fluxes, from electronic components comprising washing said components with an azeotrope-type mixture as claimed in claim 1.
Claim 7
Dependent Claim
17 words
A process according to claim 4 wherein said electronic components are soldered circuit boards or printed circuits.
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) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |