US2681321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of porous materials from film-forming organic thermoplastic masses
Assignee: BASF SE
•
Filing: 1951-02-24
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Granted: 1954-06-15
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Expires: 1971-02-24
Abstract
No abstract record available.
Inventors
- 👤 Stastny Fritz
- 👤 Gaeth Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; Y; Y10; Y10S; Y10S264/00; Y10S264/61; Y10S424/00; Y10S424/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A PROCESS FOR THE PRODUCTION OF POROUS POLYSTYRENE WHICH COMPRISES HOMOGENEOUSLY DISPERSING IN MONOSTYRENE AN ORGANIC VOLATILE NON-REACTIVE LIQUID IN WHICH POLYSTYRENE IS INSOLUBLE, POLYMERIZING THIS MIXTURE AT TEMPERATURES BELOW THE BOILING POINT OF THE LIQUID UNDER THE CONDITIONS EMPLOYED, AND HEATING THE RESULTING MASS TO A TEMPERATURE ABOVE THE BOILING POINT OF THE LIQUID AND ABOVE THE SOFTENING POINT BUT NOT MORE THAN ABOUT A FEW DEGREES ABOVE THE SOFTENING POINT OF THE RESULTING POLYSTYRENE, THE RELATIVE PROPORTIONS OF MONOSTYRENE AND SAID LIQUID EMPLOYED BEING SUCH THAT THE POLYMERIZATION PRODUCT IS A SOLID BODY CONTAINING THE LIQUID DISPERSED THROUGHOUT.
Claim 2
Dependent Claim
100 words
A PROCESS FOR THE PRODUCTION OF POROUS POLYSTYRENE WHICH COMPRISES HOMOGENEOUSLY DISPERSING IN MONOSTYRENE AN ORGANIC VOLATILE NON-REACTIVE LIQUID IN WHICH POLYSTYRENE IS INSOLUBLE, POLYMERIZING THIS MIXTURE AT TEMPERATURES BELOW THE BOILING POINT OF THE LIQUID UNDER THE CONDITIONS EMPLOYED, AND HEATING THE RESULTING MASS TO A TEMPERATURE ABOVE THE BOILING POINT OF THE LIQUID AND ABOVE THE SOFTENING POINT BUT NOT MORE THAN ABOUT A FEW DEGREES ABOVE THE SOFTENING POINT OF THE RESULTING POLYSTYRENE, THE RELATIVE PROPORTIONS OF MONOSTYRENE AND SAID LIQUID EMPLOYED BEING SUCH THAT THE POLYMERIZATION PRODUCT IS A SOLID BODY CONTAINING THE LIQUID DISPERSED THROUGHOUT.
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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) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |