Patent US3563969A successfully refreshed from Google Patents.
US3563969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of vinyl benzyl halide polymers and their quaternary ammonium salts
Assignee: Dow Chemical Co
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Filing: 1968-12-03
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Granted: 1971-02-16
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Expires: 1988-12-03
Abstract
Abstract AN IMPROVEMENT IN A PROCESS FOR PREPARING AND PURIFYING VINYL BENZYL HALIDE POLYMERS AND THE QUATERNARY AMMONIUM SALTS THEREOF, SUCH AS VINYL BENZYL TRIMETHYLAMMONIUM CHLORIDE POLYMERS, WHEREIN THE REACTION PRODUCT CONTAINING THE VINYL BENZYL HALIDE POLYMER OR THE QUATERNARY AMMONIUM SALT THEREOF IS IN THE FORM OF AN EMULSION HAVING AN ORGANIC LIQUID PHASE AND AN AQUEOUS PHASE, SAID IMPROVEMENT COMPRISING THE STEPS OF (1) DISPERSING IN THE EMULSION UP TO ABOUT 100 P.P.M. BASED ON THE VOLUME OF THE EMULSION OF A POLYSILOXANE COMPOUND AND (2) WITHDRAWING THE ORGANIC LIQUID LAYER FROM THE AQUEOUS LAYER.
Inventors
- 👤 Bonnie F Hartenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:48
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 0
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |