US5073206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning using azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, methanol and nitromethane
Assignee: Honeywell International Inc
•
Filing: 1990-03-07
•
Granted: 1991-12-17
•
Expires: 2010-03-07
Abstract
Abstract A method of cleaning a solid surface is disclosed. The method involves spraying the solid surface with azeotrope-like compositions by using a propellant. The azeotrope-like compositions comprise from about 93.0 to about 98.0 weight percent 1,1-dichloro-1-fluoroethane, from about 7 to about 2 weight percent methanol, and from about 0.1 to about 0.01 weight percent nitromethane. Preferably, the propellant is selected from the group consisting of hydrocarbons, chlorofluorocarbons, hydrochlorofluorocarbon, hydrofluorocarbon, dimethyl ether, carbon dioxide, nitrogen, nitrous oxide, methylene oxide, air, and mixtures thereof.
Inventors
- 👤 David P. Wilson
- 👤 Ian R. Shankland
- 👤 Earl A. E. Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:50
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; C23G5/02809; C23G5/02825; C23G5/02829; C23G5/02832
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
48 words
A method of cleaning a solid surface which comprises spraying said surface with azeotrope-like compositions comprising from about 93.0 to about 98.0 weight percent 1,1-dichloro-1-fluoroethane, from about 7 to about 2 weight percent methanol, and from about 0.1 to about 0.01 weight percent nitromethane by using a propellant.
Claim 2
Independent Claim
48 words
A method of cleaning a solid surface which comprises spraying said surface with azeotrope-like compositions comprising from about 93.0 to about 98.0 weight percent 1,1-dichloro-1-fluoroethane, from about 7 to about 2 weight percent methanol, and from about 0.1 to about 0.01 weight percent nitromethane by using a propellant.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said propellant is selected from the group consisting of hydrochlorofluorocarbon, hydrofluorocarbon, and mixtures thereof.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein said propellant is hydrochlorofluorocarbon.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein said hydrofluorocarbon is chlorodifluoromethane.
Claim 6
Dependent Claim
10 words
The method of claim 2 wherein said propellant is hydrofluorocarbon.
Claim 7
Dependent Claim
10 words
The method of claim 5 wherein said hydrofluorocarbon is 1,1,1,2-tetrafluoroethane.
Claim 8
Dependent Claim
41 words
The method of claim 1 wherein said azeotrope-like compositions comprise from about 95.0 to about 97.0 weight percent said 1,1-dichloro-1-fluoroethane, from about 5 to about 3 weight percent said methanol, and from about 0.1 to about 0.1 weight percent said nitromethane.
Claim 9
Dependent Claim
29 words
The method of claim 1 wherein said azeotrope-like compositions comprise about 96.0 weight percent said 1,1-dichloro-1-fluoroethane, about 3.9 weight percent said methanol, and about 0.01 weight percent said nitromethane.
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) | 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 |