US3792126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing vinyl aromatic monomers using new radical-type catalysts
Assignee: Societe Nationale des Petroles dAquitaine SA
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Filing: 1971-06-21
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Granted: 1974-02-12
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Expires: 1991-06-21
Abstract
Abstract THE PRESENT INVENTION CONCERNS A PROCESS FOR POLYMERIZING NONOMERS AND PARTICULARLY STYRENE BY USING NEW CATALYSTS. THE INVENTION IS CHARACTERIZED BY THE FACT THAT ORGANIC SILICON DERIVATIVES, WITH A HIGHER TEMPERATURE STABILITY THAN THE CATALYST NORMALLY USED, ARE USED AS CATLYSTS. THE USE OF THESE NEW ORGANIC SILICON DERIVATIVES AS CATALYSTS PARTICULARLY IN POLYMERIZING STYRENE ENSURES A SIGNIFICANT REDUCTION IN THE RESIDUAL MONOMER CONTENT OF THE POLYSTYRENE PRODUCT, AND THUS ALLOWS SUCH A PRODUCT TO BE USED IN CONTACT WITH FOODSTUFFS.
Inventors
- 👤 L Vio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:19
CPC Classifications
C; C08; C08F; C08F4/00; C08F2/00; C08F279/00; C08F279/02
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |