US3055848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of foaming and curing a polyvinyl chloride plastisol by use of subatmospheric pressure and an applied high-frequency electric field, respectively
Assignee: Wacker Chemie AG
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Filing: 1959-09-04
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Granted: 1962-09-25
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Expires: 1979-09-04
Abstract
No abstract record available.
Inventors
- 👤 Heckmaier Joseph
- 👤 Michl Karl-Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:07
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
PROCESS FOR THE PRODUCTION OF POLYVINYLCHLORIDE FOAMED STRUCTURES, WHICH COMPRISES INTRODUCING INTO A CONFINED SPACE OF THE DESIRED SHAPE A POLYVINYLCHLORIDE PLASTISOL CONTAINING ONLY THE GAS ABSORBED THEREIN UNDER ATMOSPHERIC PRESSURE WHILE FORMING THE PLASTISOL, REDUCING THE PRESSURE IN SAID CONFINED SPACE TO SUBATMOSPHERIC PRESSURE WHEREBY THE CONTAINED GAS ABSORBED IN SAID PLASTISOL CONFORMING TO THE SHAPE OF THE CONFINED SPACE, STRUCTURE CONFORMING TO THE SHAPE OF THE CONFINED SPACE AND THEN CAUSING THE FOAMED STRUCTURE TO UNDERGO GELATION BY HEATING THE LATTER WITH AN APPLIED HIGH-FREQUENCY ELECTRIC FIELD.
Claim 2
Dependent Claim
89 words
PROCESS FOR THE PRODUCTION OF POLYVINYLCHLORIDE FOAMED STRUCTURES, WHICH COMPRISES INTRODUCING INTO A CONFINED SPACE OF THE DESIRED SHAPE A POLYVINYLCHLORIDE PLASTISOL CONTAINING ONLY THE GAS ABSORBED THEREIN UNDER ATMOSPHERIC PRESSURE WHILE FORMING THE PLASTISOL, REDUCING THE PRESSURE IN SAID CONFINED SPACE TO SUBATMOSPHERIC PRESSURE WHEREBY THE CONTAINED GAS ABSORBED IN SAID PLASTISOL CONFORMING TO THE SHAPE OF THE CONFINED SPACE, STRUCTURE CONFORMING TO THE SHAPE OF THE CONFINED SPACE AND THEN CAUSING THE FOAMED STRUCTURE TO UNDERGO GELATION BY HEATING THE LATTER WITH AN APPLIED HIGH-FREQUENCY ELECTRIC FIELD.
References Cited (Backward Citations)
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US2140063A
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US2532502A
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US2737503A
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US2666036A
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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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |