Patent US3681270A successfully refreshed from Google Patents.
US3681270A
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Process for the manufacture of foam materials containing plasticizer from polyvinylchloride and copolymers thereof
Assignee: Dynamit Nobel AG
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Filing: 1970-05-22
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Granted: 1972-08-01
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Expires: 1990-05-22
Abstract
Abstract PROCESS FOR THE PREPARATION OF FOAM MATERIAL OF VINYLCHLORIDE COPOLYMERS HAVING A K VALUE OF ABOUT 65 TO 82 BY TREATING A PLASTISOL OF THIS COPOLYMER WITH A GAS WHICH IS A CARBON DIOXIDE-AIR OR A CARBON DIOXIDENITROGEN MIXTURE AT A TEMPERATURE OF BETWEEN 0 AND 30* C., AND PREFERABLY BETWEEN 10 AND 25*C., AND AT A PRESSURE OF ABOUT 80 TO 120, PREFERABLY 90 TO 110, ATOMOSPHERES BY EXPANDING THE PRESSURIZED GAS-PLASTISOL TO ATMOSPHERIC PRESSURE, SETTING THE THUS FORMED FOAM MATERIAL, AND RECYCLING EXCESS GAS AFTER FOAMING.
Inventors
- 👤 Otto Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:10
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/122; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |