US3632848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Post-chlorination of vinyl chloride resins in aqueous suspension
Assignee: Dow Chemical Co
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Filing: 1969-03-19
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Granted: 1972-01-04
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Expires: 1989-03-19
Abstract
Abstract THIS INVENTION RELATES TO AN IMPROVED PROCESS FOR POSTCHLORINATING VINYL CHLORIDE RESINS IN AQUEOUS SUSPENSION. MORE PARTICULARLY, IT IS DIRECTED TO A PROCESS WHEREBY VINYL CHLORIDE RESINS ARE CHLORINATED IN AQUEOUS SUSPENSION WHILE MAINTAINING SUCH SUSPENSION AT A TEMPERATURE ABOVE 100* C. BUT BELOW 140*C. THIS PROCESS ELIMINATES LENGTHY CHLORINATION INDUCTION PERIODS AS WELL AS UNDESIRABLY HIGH REACTION PRESSURE AND FURTHER PROVIDES FOR A RAPID MEANS OF PRODUCING POST-CHLORINATED VINYL CHLORIDE RESINS CHARACTERIZED BY HIGH HEAT DISTORTION VALUES.
Inventors
- 👤 Warren L Young
- 👤 James S Kennedy
- 👤 Norman F Carnahan
- 👤 Robert R Blanchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:51
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |