US4743675A
Expired / Lapsed
US
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Thermotropic cholesteric liquid crystalline polypeptide comprising alpha-benzyl glutamate-alpha-alkyl glutamate copolymer
Assignee: Eneos Corp
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Filing: 1986-05-28
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Granted: 1988-05-10
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Expires: 2006-05-28
Abstract
Abstract A gamma -benzyl glutamate- gamma -alkyl glutamate copolymer having the general formula (I) <IMAGE> (I) wherein; R is C10-30 alkyl group, m and n are 50</=m+n</=2,000 and m/n=80-10/20-90, and benzyl ester unit and alkyl ester unit are either both L-forms or both D-forms.
Inventors
- 👤 Junji Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:25
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/389; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/10; G; G02; G02B; G02B5/00; G02B5/30; G02B5/3016
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
50 words
A thermotropic cholesteric liquid crystalline γ-benzyl glutamate-γ-alkyl glutamate copolymer consisting essentially of repeating units represented by the general formula (I) ##STR3## wherein; R is C 10-30 alkyl group, m and n are 50<m+n<2,000 and m/n=70-40/30-60, and benzyl ester unit and alkyl ester unit are either both L-forms or both D-forms.
Claim 2
Dependent Claim
50 words
A thermotropic cholesteric liquid crystalline γ-benzyl glutamate-γ-alkyl glutamate copolymer consisting essentially of repeating units represented by the general formula (I) ##STR3## wherein; R is C 10-30 alkyl group, m and n are 50<m+n<2,000 and m/n=70-40/30-60, and benzyl ester unit and alkyl ester unit are either both L-forms or both D-forms.
Claim 3
Dependent Claim
14 words
A copolymer as claimed in claim 1, wherein R is C 12-25 alkyl group.
References Cited (Backward Citations)
US3119794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |