US3762952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of vinylbenzylhalide polymeric deposits from surfaces
Assignee: Dow Chemical Co
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Filing: 1972-10-30
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Granted: 1973-10-02
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Expires: 1992-10-30
Abstract
Abstract Deposits of polymer on the surfaces of process equipment used for the manufacture of vinylbenzyl halides are removed by contacting the fouled surfaces with a mixture of aqueous tertiary amine and a polymer-swelling solvent, i.e., chlorinated hydrocarbon or aromatic hydrocarbon and separating the thereby loosened deposits by means such as ultrasonic vibrations or a water wash.
Inventors
- 👤 A Gouin
- 👤 R Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:28
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
The method of claim 1 wherein the vinylbenzyl halide is vinylbenzyl chloride.
Claim 2
Dependent Claim
14 words
The method of claim 2 wherein the solvent is a chlorinated lower aliphatic hydrocarbon.
Claim 3
Dependent Claim
11 words
The method of claim 3 wherein the solvent is methylene chloride.
Claim 4
Dependent Claim
10 words
The method of claim 4 wherein the amine is trimethylamine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |