Patent US3784594A successfully refreshed from Google Patents.
US3784594A
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Cellular material produced from copolymers of cyclic vinyl ethers and cyclic acetals
Assignee: Union Carbide Corp
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Filing: 1971-05-25
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Granted: 1974-01-08
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Expires: 1991-05-25
Abstract
Abstract NOVEL COPOLYMERIZATION PRODUCTS ARE PROVIDED BY THE CATIONIC POLYMERIZATION OF A DI-(DIHYDROPYRANYL) COMPOUND WITH A SUBSTITUTED 1,3-DIOXOLANE OR A SUBSTITUTED 1,3-DIOXANE. THE COPOLYMERIZATION PRODUCTS POSSESS IMPROVED ABRASION RESISTANCE AND TOUGHNESS AS COMPARED WITH THE HOMOPOLYMERS OF THE DI-(DIHYDROPYRANYL) MONERS. ESPECIALLY USEFUL, PARTICULARLY IN PROVIDING FOAMED POLYMERIC MATERIALS OF IMPROVED FRIABILITY RESISTANCE, ARE THE POLYMERIZATION REACTION PRODUCTS OF 3,4DIHYDRO-2H-PYRAN-2-METHYL(3,4 - DIHYDRO-2H-PYRAN-2-CARBOXYLATE) AND A BIS-DIOXOLANYL OR A BIS-DIOXANYL CARBAMATE.
Inventors
- 👤 A Papa
- 👤 W Proops
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:29
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/04; C07D319/08; C07D317/00; C07D317/08; C07D317/10; C07D317/12; C07D317/14; C07D317/18; C07D317/20; C07D317/24; C07D319/06; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/81; C08G18/8141; C08G18/815; C08G18/8158; C08G61/00
Claims Analysis
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |