Patent US3872140A successfully refreshed from Google Patents.
US3872140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystalline compositions and method
Assignee: Eastman Kodak Co
•
Filing: 1973-02-12
•
Granted: 1975-03-18
•
Expires: 1993-02-12
Abstract
Abstract A method is described for forming mixtures of Schiff bases wherein at least two different Schiff bases are mixed together and heated in the presence of a catalyst to effect an interconversion of substituents thereon. This results in a multicomponent mixture of Schiff bases having all combinations of the terminal substituents of the starting materials. This method is useful in forming nematic liquid crystalline compositions having a broad mesomorphic temperature range.
Inventors
- 👤 Bruce H Klanderman
- 👤 Thomas R Criswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:43
CPC Classifications
C; C07; C07C; C07C255/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
22 words
A PROCESS FOR INTERCONVERSION OF SCHIFF BASES COMPRISING THE STEPS OF MIXING TOGETHER AT LEAST TWO DIFFERENT SCHIF BASES OF THE FORMULA:
Claim 2
Dependent Claim
22 words
A PROCESS FOR INTERCONVERSION OF SCHIFF BASES COMPRISING THE STEPS OF MIXING TOGETHER AT LEAST TWO DIFFERENT SCHIF BASES OF THE FORMULA:
Claim 3
Dependent Claim
22 words
A PROCESS FOR INTERCONERSION OF SCHIFF BASES COMPRISING THE STEPS OF MIXING TOGETHER AT LEAST TWO DIFFERENT SCHIFF BASES OF THE FORMULA:
Claim 4
Dependent Claim
22 words
A PROCESS FOR INTERCONERSION OF SCHIFF BASES COMPRISING THE STEPS OF MIXING TOGETHER AT LEAST TWO DIFFERENT SCHIFF BASES OF THE FORMULA:
Claim 5
Dependent Claim
22 words
A process for interconversion of Schiff bases comprising the steps of mixing together at least two different Schiff bases of the formula:
Claim 6
Dependent Claim
22 words
A process for interconversion of Schiff bases comprising the steps of mixing together at least two different Schiff bases of the formula:
Claim 7
Dependent Claim
45 words
The process as described in claim 1 wherein R and R'' are each selected from the group consisting of An acyloxy radical having two to about 12 carbon atoms and an alkoxy carbonyloxy radical having one to about 12 carbon atoms in the alkoxy moiety.
Claim 8
Dependent Claim
50 words
The proces as described in claim 1 wherein R is an alkoxy radical having one to about 12 carbon atoms and R'' is selected from the group consisting of an alkyl radical having one to about 12 carbon atoms and an acyloxy radical having two to about 12 carbon atoms.
Claim 9
Dependent Claim
29 words
A process of forming a multicomponent nematic liquid crystalline composition comprising the steps of mixing together at least two different nematic liquid crystalline Schiff base reactants of the formula:
Claim 10
Dependent Claim
29 words
A process of forming a multicomponent nematic liquid crystalline composition comprising the steps of mixing together at least two different nematic liquid crystalline Schiff base reactants of the formula:
Claim 11
Dependent Claim
15 words
The process as described in claim 6 wherein said resin is a polystyrene ion-exchange resin.
Claim 12
Dependent Claim
18 words
The process as described in claim 6 wherein the ion-exchange resin comprises a copolymer of styrene and p-divinylbenzene.
Claim 13
Dependent Claim
21 words
A process for interconversion of Schiff bases comprising the steps of mixing (a) at least one Schiff base of the formula:
Claim 14
Dependent Claim
21 words
A process for interconversion of Schiff bases comprising the steps of mixing (a) at least one Schiff base of the formula:
References Cited (Backward Citations)
US2544659A
Cited
US3675987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |