US4269630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-step process and composition for cleaning polished surfaces
Assignee: Individual
•
Filing: 1979-10-01
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Granted: 1981-05-26
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Expires: 1999-10-01
Abstract
Abstract Optical components and highly-polished metal surfaces are cleaned with a first composition comprising 1,1,2-trichloro-1,2,2-trifluoroethane, isopropyl alcohol, dimethylformamide and 2-ethoxyethanol; then, while the surface is still wet with said first composition, a second composition, comprising at least about 85% 1,1,2-trichloro-1,2,2-trifluoroethane and containing less than 10 ppm of non-volatile residues, is applied to rinse the surface; and the surface is permitted to dry.
Inventors
- 👤 George M. Stephenson
- 👤 William Colucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:42
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/26; C11D7/261; C11D7/50; C11D7/5004; C11D7/5013; C11D7/28; C11D7/32
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
A composition for removing contaminating oils and salts from highly-polished surfaces comprising, on a weight basis, from about 50 to 65% 1,1,2-trichloro-1,2,2-trifluoroethane, from about 25 to 35% isopropyl alcohol, from about 1 to 5% dimethylformamide, and from about 5 to 15% 2-ethoxyethanol.
Claim 2
Dependent Claim
42 words
A composition for removing contaminating oils and salts from highly-polished surfaces comprising, on a weight basis, from about 50 to 65% 1,1,2-trichloro-1,2,2-trifluoroethane, from about 25 to 35% isopropyl alcohol, from about 1 to 5% dimethylformamide, and from about 5 to 15% 2-ethoxyethanol.
Claim 3
Dependent Claim
21 words
A composition according to claim 1 comprising about 57% 1,1,2-trichloro-1,2,2-trifluoroethane, about 31% isopropyl alcohol, about 2% dimethylformamide, and about 10% 2-ethoxyethanol.
Claim 4
Dependent Claim
113 words
A process for cleaning highly-polished surfaces with a cleaner composition comprised of two different portions, which comprises: (a) applying to the surface to be cleaned a first portion of the cleaner comprising, on a weight basis, from about 50 to 65% 1,1,2-trichloro-1,2,2-trifluoroethane, from about 25 to 35% isopropyl alcohol, from about 1 to 5% dimethylformamide, and from about 5 to 15% 2-ethoxyethanol; then, (b) while the surface is still wet with said first portion, rinsing the surface with a second portion of the cleaner composition which comprises, on a weight basis, at least about 85% 1,1,2-trichloro-1,2,2-trifluoroethane which contains less than 10 ppm of non-volatile residues; and then (c) permitting the surface to dry.
Claim 5
Dependent Claim
113 words
A process for cleaning highly-polished surfaces with a cleaner composition comprised of two different portions, which comprises: (a) applying to the surface to be cleaned a first portion of the cleaner comprising, on a weight basis, from about 50 to 65% 1,1,2-trichloro-1,2,2-trifluoroethane, from about 25 to 35% isopropyl alcohol, from about 1 to 5% dimethylformamide, and from about 5 to 15% 2-ethoxyethanol; then, (b) while the surface is still wet with said first portion, rinsing the surface with a second portion of the cleaner composition which comprises, on a weight basis, at least about 85% 1,1,2-trichloro-1,2,2-trifluoroethane which contains less than 10 ppm of non-volatile residues; and then (c) permitting the surface to dry.
Claim 6
Dependent Claim
32 words
A process according to claim 3 wherein the second portion of the cleaner composition further comprises a surface active agent in an amount effective to prevent pooling or spot concentrations of residues.
Claim 7
Dependent Claim
29 words
A process according to claim 4 wherein the first portion of the cleaning composition comprises about 57% 1,1,2-trichlor-1,2,2-trifluoroethane, about 31% isopropyl alcohol, about 2% dimethylformamide, and about 10% 2-ethoxyethanol.
Claim 8
Dependent Claim
34 words
A process according to claim 3 wherein the second portion of the cleaning composition comprises about 99% 1,1,2-trichloro-1,2,2-trifluoroethane and about 1% of a surface active agent to prevent pooling or spot concentrations of residues.
Claim 9
Dependent Claim
29 words
A process according to claim 6 wherein the first portion of the cleaning composition comprises about 57% 1,1,2-trichloro-1,2,2-trifluoroethane, about 31% isopropyl alcohol, about 2% dimethylformamide, and about 10% 2-ethoxyethanol.
Claim 10
Dependent Claim
26 words
A process according to either of claims 3 or 7 wherein the first and second portions of the composition of the invention are applied by spraying.
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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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |