US4152510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane elastomers and a process for their production
Assignee: Bayer AG
•
Filing: 1977-10-25
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Granted: 1979-05-01
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Expires: 1997-10-25
Abstract
Abstract Novel polyurethane elastomers having excellent physical properties are prepared utilizing as chain extenders aromatic diamine compounds having the general formula ##STR1## wherein R is hydrogen, C 1 to C 4 alkyl, halogen, C.tbd.N, CF 3 or SO 2 --Z wherein Z is C 1 to C 4 alkyl, several of which diamine compounds are hitherto unknown in the art.
Inventors
- 👤 Johannes Blahak
- 👤 Walter Meckel
- 👤 Erwin Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3814; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
Polyurethane elastomers which contain structural units having the formula ##STR14## wherein R represents a hydrogen atom or C 1 to C 4 alkyl radicals, and X represents fluorine, chlorine or bromine atoms.
Claim 2
Dependent Claim
32 words
Polyurethane elastomers which contain structural units having the formula ##STR14## wherein R represents a hydrogen atom or C 1 to C 4 alkyl radicals, and X represents fluorine, chlorine or bromine atoms.
Claim 3
Dependent Claim
12 words
The polyurethane elastomers of claim 1 wherein X is a chlorine atom.
References Cited (Backward Citations)
US3036996A
Cited
US3660326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |