US3885982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal coating
Assignee: BELL JAMES R JR
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Filing: 1970-08-17
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Granted: 1975-05-27
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Expires: 1990-08-17
Abstract
Abstract Liquid-crystal materials, especially the cholesteric, are protected against dust, contamination, etc. by being provided with a coating in accordance with a method involving mixing the liquid-crystal material with a monomer, such as tung oil, in which it is soluble but which will polymerize at a liquid-gas interface to form a polymer insoluble in the liquid-crystal material. The method is more convenient and less costly than other practices hitherto used, such as gelatin microencapsulation.
Inventors
- 👤 James L Fergason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:48
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/36; C08; C08L; C08L91/00; C08L91/005; C09K19/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
AS A COMPOSITION OF MATTER, A MIXTURE CONSISTING ESSENTIALLY OF 10 TO 80 WEIGHT PERCENT OF A LIQUID CRYSTAL AND 90 TO 20 WEIGHT PERCENT OF A MONOMER DRYING OIL MISCIBLE WITH THE LIQUID CRYSTAL BUT CAPABLE OF FORMING AT A LIQUID-GAS INTERFACE OVER THE LIQUID CRYSTAL AN ESSENTIALLY TRANSPARENT HARD SURFACE POLYMER COATING INSOLUBLE IN THE LIQUID CRYSTAL, THE LIQUID CRYSTAL HAVING THE PROPERTY OF SELECTIVE LIGHT SCATTERING AND BEING SELECTED FROM THE GROUP CONSISTING OF CHOLESTERIC-PHASE LIQUID CRYSTALS AND NEMATIC-PHASE LIQUID CRYSTALS.
Claim 2
Dependent Claim
84 words
AS A COMPOSITION OF MATTER, A MIXTURE CONSISTING ESSENTIALLY OF 10 TO 80 WEIGHT PERCENT OF A LIQUID CRYSTAL AND 90 TO 20 WEIGHT PERCENT OF A MONOMER DRYING OIL MISCIBLE WITH THE LIQUID CRYSTAL BUT CAPABLE OF FORMING AT A LIQUID-GAS INTERFACE OVER THE LIQUID CRYSTAL AN ESSENTIALLY TRANSPARENT HARD SURFACE POLYMER COATING INSOLUBLE IN THE LIQUID CRYSTAL, THE LIQUID CRYSTAL HAVING THE PROPERTY OF SELECTIVE LIGHT SCATTERING AND BEING SELECTED FROM THE GROUP CONSISTING OF CHOLESTERIC-PHASE LIQUID CRYSTALS AND NEMATIC-PHASE LIQUID CRYSTALS.
Claim 3
Dependent Claim
26 words
A composition as defined in claim 1, characterized in that said drying oil is selected from the group consisting of tung, linseed oiticica and perilla oils.
Claim 4
Independent Claim
133 words
A method for obtaining a surface provided with a coating of a liquid crystal protected against moisture, dust and contaminants, said method comprising the steps of: mixing 1 to 8 parts by weight of a liquid crystal with 9 to 2 parts by weight of a monomer drying oil miscible with the liquid crystal, the liquid crystal having the property of selective light scattering and being selected from the group consisting of cholesteric-phase liquid crystals and nematic-phase liquid crystals, applying said mixture to said surface to form a coated surface, and exposing said coated surface to air, whereby the molecular oxygen of said air polymerizes said drying oil to yield a uniform, permanent, hard surface flexible film insoluble in said liquid crystal, said film protecting the liquid crystal against moisture, dust and contaminants.
Claim 5
Independent Claim
133 words
A method for obtaining a surface provided with a coating of a liquid crystal protected against moisture, dust and contaminants, said method comprising the steps of: mixing 1 to 8 parts by weight of a liquid crystal with 9 to 2 parts by weight of a monomer drying oil miscible with the liquid crystal, the liquid crystal having the property of selective light scattering and being selected from the group consisting of cholesteric-phase liquid crystals and nematic-phase liquid crystals, applying said mixture to said surface to form a coated surface, and exposing said coated surface to air, whereby the molecular oxygen of said air polymerizes said drying oil to yield a uniform, permanent, hard surface flexible film insoluble in said liquid crystal, said film protecting the liquid crystal against moisture, dust and contaminants.
Claim 6
Dependent Claim
22 words
The method of claim 3 wherein said dyring oil is selected from the group consisting of tung, linseed oiticica and perilla oils.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |