US3903009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotrope of 1,1,2-trichloro-1,2,2-trifluoroethane, ethanol and nitromethane
Assignee: EIDP Inc
•
Filing: 1973-11-16
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Granted: 1975-09-02
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Expires: 1993-11-16
Abstract
Abstract A minimum boiling point azeotrope containing about 95.3 percent 1,1,2-trichloro-1,2,2-trifluoroethane, 3.6 percent ethanol and 1.1 percent nitromethane by weight, useful for cleaning circuit boards.
Inventors
- 👤 Albert Webb Bauer
- 👤 James Gordon Burt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:32
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5095; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A MINIMUM BOILING POINT AZEOTROPIC COMPOSITION CONSISTING ESSENTIALLY OF ABOUT 95.3 WEIGHT PERCENT 1,1,2-TRICHLORO1,2,2-TRIFLUOROETHANE, ABOUT 3.6 WEIGHT PERCENT ETHANOL, AND ABOUT 1.1 WEIGHT PERCENT NITROMETHANE.
Claim 2
Dependent Claim
25 words
A MINIMUM BOILING POINT AZEOTROPIC COMPOSITION CONSISTING ESSENTIALLY OF ABOUT 95.3 WEIGHT PERCENT 1,1,2-TRICHLORO1,2,2-TRIFLUOROETHANE, ABOUT 3.6 WEIGHT PERCENT ETHANOL, AND ABOUT 1.1 WEIGHT PERCENT NITROMETHANE.
References Cited (Backward Citations)
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US3573213A
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US3789006A
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US3723332A
Cited
US3728268A
Cited
US3789004A
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |