Patent US3862250A successfully refreshed from Google Patents.
US3862250A
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Methylene chloride stabilized with acetonitrile
Assignee: OCCIDENTIAL ELECTROCHEMICALS Corp
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Filing: 1973-02-23
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Granted: 1975-01-21
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Expires: 1993-02-23
Abstract
Abstract Acetonitrile and optionally propylene oxide in admixture with methylene chloride have been found to prevent degradation of methylene chloride in the presence of metals, metal halides, combinations thereof, and aromatic compounds, which react with methylene chloride in the presence of said metals, metal halides and combinations thereof. Reactions of aliphatic organic compounds with said metals, metal halides and combinations thereof to form products which result in deterioration of methylene chloride are also inhibited. A method for vapor degreasing metals by using the stabilized methylene chloride is described.
Inventors
- 👤 Norman L Beckers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:57
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02854; C23G5/02883; C07; C07C; C07C17/00; C07C17/38; C07C17/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
34 words
A STABILIZED METHYLENE CHLORIDE COMPOSITION CONSISTING ESSENTIALLY OF METHYLENE CHOLRIDE AND STABILIZING AMOUNTS OF FROM ABOUT 0.05 TO ABOUT 2.0 PERCENT BY WEIGHT OF THE METHYLENE CHLORIDE OF EACH OF ACETONITRILE AND PROPYLENE OXIDE.
Claim 2
Dependent Claim
34 words
A STABILIZED METHYLENE CHLORIDE COMPOSITION CONSISTING ESSENTIALLY OF METHYLENE CHOLRIDE AND STABILIZING AMOUNTS OF FROM ABOUT 0.05 TO ABOUT 2.0 PERCENT BY WEIGHT OF THE METHYLENE CHLORIDE OF EACH OF ACETONITRILE AND PROPYLENE OXIDE.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein from about 0.10 to about 1.0 percent by weight of each of acetonitrile and propylene oxide is present.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |