US3700645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing mercapto-terminated chloroprene copolymers
Assignee: Denka Co Ltd
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Filing: 1971-03-16
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Granted: 1972-10-24
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Expires: 1991-03-16
Abstract
Abstract MERCAPTO-TERMINATED CHLOROPRENE - COPOLYMER IS PREPARED BY THE STEPS OF DISSOLVING A MIXTURE OF CHLOROPRENE MONOMER AND A COMPARATIVELY LARGE AMOUNT OF SULFUR INTO ORGANIC SOLVENT, COPOLYMERIZING SAID MIXTURE BY THE SOLUTION POLYMERIZATION METHOD, AND CLEAVING THE OBTAINED COPOLYMER BY THE ACTION OF NASCENT STATE HYDROGEN IN THE SOLUTION. THE OBTAINED COPOLYMER IS LIQUID AT AMBIENT TEMPERATURE AND CAN BE EASILY CURED USING ORDINARY CURING AGENTS.
Inventors
- 👤 Ichiro Fukuoka
- 👤 Satoshi Takahashi
- 👤 Norio Yagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:34
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/14; C08F236/16
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |