US3087912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of crosslinked plastics of high molecular weight
Assignee: Bayer AG
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Filing: 1958-09-08
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Granted: 1963-04-30
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Expires: 1978-09-08
Abstract
No abstract record available.
Inventors
- 👤 Wagner Kuno
- 👤 Bayer Otto
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:37
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/84; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
108 words
A METHOD FOR MAKING A POLYURETHANE WHICH COMPRISES REACTING A MEMBER SELECTED FROM THE GROUP CONSISTING OF A POLYHYDRIC POLYALKYLENE ETHER AND AN HYDROXYL TERMINATED POLYTHIOETHER, SAID GROUP MEMBER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 500 WITH AN ORGANIC POLYISOCYANATE IN A REACTION MIXTURE CONTAINING AN EXCESS OF THE POLYISOCYANATE TO FORM AN -NCO TERMINATED ADDUCT, EACTING THE ADDUCT WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AMMONIA, HYDRAZINE, ALIPHATIC DIAMINES, AROMATIC DIAMINES, CYCLOALIPHATIC DIAMINES, N,N,DIHYDROXYETHYL UREA, DICYANDIAIDE, AND N,N,DIHYDROXYETHYL MELAMINE IN A REACTION MIXTURE CONTAINING AN EXCESS OF THE SAID GROUP MEMBER AND THEREAFTER REACTING THE SECOND ADDUCT HAVING TERMINAL NH2 GROUPS WITH FORMALDEHYDE.
References Cited (Backward Citations)
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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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |