US3248370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane process utilizing a diisocyanate mixture
Assignee: Bayer AG
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Filing: 1962-10-23
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Granted: 1966-04-26
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Expires: 1982-10-23
Abstract
No abstract record available.
Inventors
- 👤 Reischl Artur
- 👤 Kallert Wilhelm
- 👤 Muller Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/798; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/302; C08G18/65; C08G18/6505; C08G18/6511; C08G18/721; C08G18/725; Y; Y10; Y10S; Y10S528/00; Y10S528/903; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD OF PREPARING NON-POROUS POLYURETHANE POLYMERS HAVING THERMOPLASTIC PROPERTIES WHICH COMPRISES REACTING AT A TEMPERATURE LESS THAN 100*C. AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH -NCO GROUPS, SAID COMPOUND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 3000 AND A CHAIN-EXTENDING AGENT SELECTED FROM THE GROUP CONSISTING OF WATER AND GLYCOLS WITH A DIISOCYANATE MIXTURE OF AT LEAST 5% BY WEIGHT OF A URETDIONE DIISOCYANATE AND AT LEAST 50% BY WEIGHT OF A MONOMERIC ORGANIC DIISOCYANATE, SAID DIISOCYANATE MIXTURE BEING PRESENT IN QUANTITY SUBSTANTIALLY STOICHIOMETRICALLY EQUIVALENT TO ALL THE ACTIVE HYDROGEN ATOMS PRESENT.
Claim 2
Independent Claim
100 words
A METHOD OF PREPARING NON-POROUS POLYURETHANE POLYMERS HAVING THERMOPLASTIC PROPERTIES WHICH COMPRISES REACTING AT A TEMPERATURE LESS THAN 100*C. AN ORGANIC COMPOUND CONTAINING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH -NCO GROUPS, SAID COMPOUND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 3000 AND A CHAIN-EXTENDING AGENT SELECTED FROM THE GROUP CONSISTING OF WATER AND GLYCOLS WITH A DIISOCYANATE MIXTURE OF AT LEAST 5% BY WEIGHT OF A URETDIONE DIISOCYANATE AND AT LEAST 50% BY WEIGHT OF A MONOMERIC ORGANIC DIISOCYANATE, SAID DIISOCYANATE MIXTURE BEING PRESENT IN QUANTITY SUBSTANTIALLY STOICHIOMETRICALLY EQUIVALENT TO ALL THE ACTIVE HYDROGEN ATOMS PRESENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |