US3583957A
Expired / Lapsed
US
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Method of producing a polymer in minute globular particles
Assignee: Czech Academy of Sciences
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Filing: 1968-05-22
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Granted: 1971-06-08
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Expires: 1988-05-22
Abstract
Abstract MINUTE GLOBULAR PARTICLES OF COPOLYMERS OF MONOOLEFINS AND DIOLEFINS ARE PRODUCED IN A QUIESCENT POLYMERIZATION MIXTURE OF WHICH AT LEAST 40% ARE CONSTITUTED BY A SOLVENT WHICH INITIALLY DISSOLVES THE MONOMERS, BUT BY WHICH THE COPOLYMER IS NEITHER DISSOLVED NOR SIGNIFICANTLY SWELLED. THE LOOSE MASS OF PARTICLES FORMED BY POLYMERIZATION READILY DISINTEGRATES WHEN IMMERSED IN AN INERT LIQUID.
Inventors
- 👤 Richard Chromecek
- 👤 Iva Gavrilova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:57
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; C08F220/281; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |