US3798200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyether urethane elastomer having an improved cut growth and flex crack resistance and the process for preparation thereof
Assignee: Bridgestone Corp
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Filing: 1972-12-13
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Granted: 1974-03-19
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Expires: 1992-12-13
Abstract
Abstract POLYETHER URETHANE ELASTOMER HAVING IMPROVED CUT GROWTH AND FLEX CRACK RESISTANCE PREPARED BY USING POLYFUNCTIONAL ISOCYANATE, CURING AGENT AND POLYETHER HAVING ACTIVE HYDROGEN TERMAL GROUPS, WHEREIN THE WEIGHT AVERAGE MOLECULAR WEIGHT OF SAID POLYETHER IS WITHIN THE RANGE OF 4,000 TO 20,000 AND THE MOLECULAR WEIGHT DISTRIBUTION CURVE OF SAID POLYETHER HAS AT LEAST TWO PEAKS, AT LEAST ONE OF WHICH IS LOCATED IN THE HIGHER MOLECULAR WEIGHT REGION AND AT LEAST ANOTHER ONE OF WHICH IS LOCATED IN THE LOWER MOLECULAR WEIGHT REGION THAN THE RHEOLOGICA CRITICAL MOLECULAR WEIGHT OF SAID POLYETHER.
Inventors
- 👤 Y Watabe
- 👤 S Toki
- 👤 Y Kaneko
- 👤 T Matsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4808; C08G18/08; C08G18/10; C08G18/12
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |