US3356650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic polyurethanes
Assignee: Bayer Corp
•
Filing: 1962-01-16
•
Granted: 1967-12-05
•
Expires: 1982-01-16
Abstract
No abstract record available.
Inventors
- 👤 Wilbur R Mcelroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:25
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/6677; C08G18/67; C08G18/675
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A THERMOPLASTIC POLYURETHANE PREPARED BY REACTING (1) AN ORGANIC POLYISOCYANATE WITH (2) A MIXTURE OF ORGANIC COMPOUNDS SUBSTANTIALLY FREE OF ESTER GROUPS, ONE OF SAID COMPOUNDS HAVING ONLY TWO AND THE REMAINING COMPOUNDS HAVING AT ELAST THREE ACTIVE HYDROGEN CONTAINING GROUPS PER MOLECULE AS DETERMINED BY THE ZEREWITINOFF METHOD, WHEREIN SAID REMAINING COMPOUNDS HAVING AT LEAST THREE ACTIVE HYDROGEN CONTAINING GROUPS PER MOLECULE PROVIDE ABOUT 0.01 TO ABOUT 20 MOL PERCENT OF THE TOTAL NUMBER OF ACTIVE HYDROGEN CONTAINING GROUPS IN SAID MIXTURE (2), THE AVERAGE MOLECULAR WEIGHT OF SAID MIXTURE (2) BEING LESS THAN 500.
Claim 2
Dependent Claim
96 words
A THERMOPLASTIC POLYURETHANE PREPARED BY REACTING (1) AN ORGANIC POLYISOCYANATE WITH (2) A MIXTURE OF ORGANIC COMPOUNDS SUBSTANTIALLY FREE OF ESTER GROUPS, ONE OF SAID COMPOUNDS HAVING ONLY TWO AND THE REMAINING COMPOUNDS HAVING AT ELAST THREE ACTIVE HYDROGEN CONTAINING GROUPS PER MOLECULE AS DETERMINED BY THE ZEREWITINOFF METHOD, WHEREIN SAID REMAINING COMPOUNDS HAVING AT LEAST THREE ACTIVE HYDROGEN CONTAINING GROUPS PER MOLECULE PROVIDE ABOUT 0.01 TO ABOUT 20 MOL PERCENT OF THE TOTAL NUMBER OF ACTIVE HYDROGEN CONTAINING GROUPS IN SAID MIXTURE (2), THE AVERAGE MOLECULAR WEIGHT OF SAID MIXTURE (2) BEING LESS THAN 500.
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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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |