Patent EP0457607A2 successfully refreshed from Google Patents.
EP0457607A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical rotator
Assignee: Eneos Corp
•
Filing: 1991-05-17
•
Granted: —
•
Expires: 2011-05-17
Abstract
Abstract An optical rotator comprising a light transmitting base ; an alignment film layer formed on said base ; and a film layer formed of a liquid crystalline polymer which exhibits a twisted nematic orientation in the state of liquid crystal and assumes a glassy state at a temperature below the liquid crystal transition point of the polymer.
Inventors
- 👤 Hiroyuki Itoh
- 👤 Takehiro Toyooka
- 👤 Shigeki Iida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:02
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/08; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/126; C09K19/38; C09K19/3804; C09K19/3809; G02B5/00; G02B5/30; G02B5/3016; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133636; C09K2323/00; C09K2323/02; C09K2323/021; C09K2323/027; G02F1/133637
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
An optical rotator comprising a light transmitting base; an alignment film layer formed on said base; and a film layer formed of a liquid crystalline polymer which exhibits a twisted nematic orientation in the state of liquid crystal and assumes a glassy state at a temperature below the liquid crystal transition point of the polymer.
Claim 2
Dependent Claim
55 words
An optical rotator comprising a light transmitting base; an alignment film layer formed on said base; and a film layer formed of a liquid crystalline polymer which exhibits a twisted nematic orientation in the state of liquid crystal and assumes a glassy state at a temperature below the liquid crystal transition point of the polymer.
Claim 3
Dependent Claim
28 words
An optical rotator as set forth in claim 1, wherein said liquid crystalline polymer is an optically active, main chain type or side chain type liquid crystalline polymer.
Claim 4
Dependent Claim
39 words
An optical rotator as set forth in claim 1, wherein said liquid crystalline polymer is a combination of a main chain type or side chain type liquid crystalline polymer which is not optically active and an optically active compound.
Claim 5
Dependent Claim
18 words
An optical rotator as set forth in any preceding claim wherein said liquid crystalline polymer is a polyester.
Claim 6
Dependent Claim
17 words
An optical rotator as set forth in claim 4, wherein said polyester has an ortho-substituted aromatic unit.
Claim 7
Dependent Claim
61 words
An optical rotator as set forth in any preceding claim, wherein said alignment film layer is a polyimide film which has been subjected to a rubbing treatment, an obliquely vapor-deposited film of silicon oxide, a polyvinyl alcohol film which has been subjected to a rubbing treatment, or a film obtained by subjecting a light transmitting base to a rubbing treatment directly.
Claim 8
Dependent Claim
29 words
An optical rotator as set forth in any preceding claim, wherein said liquid crystalline polymer film layer has a thickness in the range of 2 to 1,000 p m.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.