Patent US3620889A successfully refreshed from Google Patents.
US3620889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal systems
Assignee: Vari-Light Corp
•
Filing: 1968-06-11
•
Granted: 1971-11-16
•
Expires: 1988-06-11
Abstract
Abstract Systems incorporating liquid crystals which are thermally sensitive and optically responsive to temperature changes.
Inventors
- 👤 Donald H Baltzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:06
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/36; B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/281; C09K19/52; C09K19/54; C09K19/542; C09K19/544; G; G01; G01R; G01R31/00; G01R31/26; G01R31/2644; G01R31/28; G01R31/302; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313; G02F1/132; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
25 words
The liquid crystal system claimed in claim 1 wherein said system is in the form of a discrete dry layer formed on a supporting surface.
Claim 2
Dependent Claim
20 words
The liquid crystal system claimed in claim 1 wherein said system is in the form of a self-supporting discrete sheet.
Claim 3
Dependent Claim
35 words
The liquid crystal system claimed in claim 1 wherein said plastic material comprises a plastic resin chosen from the class consisting of acrylic, styrene, polyester, epoxy, polyvinyl butyral, polyvinyl chloride, polyvinyl acetate, and polycarbonate resins.
Claim 4
Dependent Claim
18 words
The liquid crystal system claimed in claim 1 wherein said system has an insoluble light-absorbing substance dispersed therein.
Claim 5
Dependent Claim
16 words
The liquid crystal system claimed in claim 1 wherein said system includes an ultraviolet light-absorbing substance.
Claim 6
Dependent Claim
25 words
The liquid crystal system claimed in claim 1 wherein said liquid crystalline substance comprises a mixture of a plurality of different cholesteric liquid crystal compounds.
Claim 7
Dependent Claim
18 words
The liquid crystal system claimed in claim 1 wherein said system is in the form of a casting.
Claim 8
Dependent Claim
16 words
The liquid crystal system claimed in claim 8 wherein said plastic material comprises a heat-curable resin.
Claim 9
Dependent Claim
110 words
A liquid crystal system exhibiting a visually perceptible change in color in response to variations in temperture, said system being formed by dispersing a cholesteric liquid crystalline substance in solvent solution of a plastic resin chosen from the class consisting of acrylic, styrene, polyester, epoxy, polyvinyl butyral, polyvinyl chloride, polyvinyl acetate and polycarbonate resins in a ratio of about 1 to 3 parts liquid crystalline substance to about 14 parts plastic material, said parts being by weight, said system being in the form of a discrete dry layer from which the solvent has been expelled and the plastic material serves as a continuous carrier phase for the liquid crystalline substance.
Claim 10
Dependent Claim
27 words
The liquid crystal system claimed in claim 10 wherein said liquid crystalline substance is composed of a mixture of at least two different cholesteric liquid crystal compounds.
Claim 11
Dependent Claim
145 words
A liquid crystal system exhibiting a visually perceptible change between an opaque condition and a clear condition in response to variations in temperature, said system being formed by dispersing a cholesteric liquid crystalline substance in a heat-curable resin in a ratio of from about 1 to 3 parts liquid crystalline substance to about 14 parts heat-curable resin, said parts being by weight, and curing said system in sheet form, said cured sheet being characterized by a visually perceptible clouding point and a visually perceptible clearing point, said clearing point being the temperature at which the sheet changes from the opaque to the clear condition as its temperature is elevated, and said clouding point being the temperature at which the sheEt changes from the clear to the opaque condition as its temperature is lowered, said clouding point occurring at a lower temperature than said clearing point.
Claim 12
Dependent Claim
23 words
The liquid crystal system claimed in claim 12 wherein the curing temperature of the resin is above the clearing point of the system.
Claim 13
Dependent Claim
16 words
The liquid crystal system claimed in claim 13 wherein the clouding point is above room temperature.
Claim 14
Dependent Claim
16 words
The liquid crystal system claimed in claim 13 wherein the clouding point is below room temperature.
Claim 15
Dependent Claim
22 words
The liquid system claimed in claim 12 wherein the curing temperature of the resin is below the clearing point of the system.
Claim 16
Dependent Claim
16 words
The liquid crystal system claimed in claim 16 wherein said heat-curable resin comprises an acrylic monomer.
References Cited (Backward Citations)
US2928791A
Cited
US2757291A
Cited
US3409404A
Cited
US3466216A
Cited
US3386807A
Cited
US3415991A
Cited
US3445291A
Cited
US3441513A
Cited
US3490988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |