US5021188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer dispersed liquid crystal films formed by electron beam curing
Assignee: Brown University Research Foundation Inc
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Filing: 1989-12-28
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Granted: 1991-06-04
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Expires: 2009-12-28
Abstract
Abstract Optically responsive films comprising birefringent nematic and/or birefringent chiral nematic liquid crystal microdroplets dispersed in electron beam cured polymeric reaction products are disclosed.
Inventors
- 👤 Nuno A. Vaz
- 👤 George W. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:27
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/544; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
A method for making a film containing microdroplets of a birefringent nematic and/or birefringent chiral nematic liquid crystal material dispersed in a polymer film comprising: mixing a liquid crystal material with the electron-beam curable liquid precursor mixture, said electron-beam curable liquid precursor mixture comprising a mercaptan activated allyl compound; and thereafter curing the mixture in the form of a film with an electron beam to thereby form a cured polymer matrix having therein droplets of liquid crystal material displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy.
Claim 2
Independent Claim
86 words
A method for making a film containing microdroplets of a birefringent nematic and/or birefringent chiral nematic liquid crystal material dispersed in a polymer film comprising: mixing a liquid crystal material with the electron-beam curable liquid precursor mixture, said electron-beam curable liquid precursor mixture comprising a mercaptan activated allyl compound; and thereafter curing the mixture in the form of a film with an electron beam to thereby form a cured polymer matrix having therein droplets of liquid crystal material displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy.
Claim 3
Independent Claim
89 words
A method for making a film containing microdroplets of a birefringent nematic and/or birefringent chiral nematic liquid crystal material dispersed in a polymer film comprising: mixing a liquid crystal material with the electron beam precursor mixture comprising triallyl isocyanurate and pentaerythritol tetrakis(2-mercapto-propanoate); and thereafter curing the mixture in the form of a film with a focused electron beam to thereby form a cured polymer matrix which is a reaction product of said precursors containing dispersed therein droplets of liquid crystal material displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy.
Claim 4
Independent Claim
89 words
A method for making a film containing microdroplets of a birefringent nematic and/or birefringent chiral nematic liquid crystal material dispersed in a polymer film comprising: mixing a liquid crystal material with the electron beam precursor mixture comprising triallyl isocyanurate and pentaerythritol tetrakis(2-mercapto-propanoate); and thereafter curing the mixture in the form of a film with a focused electron beam to thereby form a cured polymer matrix which is a reaction product of said precursors containing dispersed therein droplets of liquid crystal material displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |