Patents by Inventor Jae-Eun Cho

Jae-Eun Cho has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Soluble polyimide resin having alkoxy substituents and the preparation method thereof
    Patent number: 6046303
    Abstract: The invention herein relates to a soluble polyimide resin for a liquid crystal alignment layer and the manufacturing method thereof, wherein a mixture of aliphatic tetracarboxylic acid dianhydrides and aromatic diamine having aliphatic side chains are used to yield a soluble polyimide resin which has superior heat-resistance, solubility, surface hardness, transparency and liquid crystal alignment capacity.The soluble polyimide resin having alkoxy substituents, for a liquid crystal layer, according to the present invention, is manufactured by adding a mixture of dioxotetrahydrofuran 3-methylcyclohexene-1,2-dicarboxylic dianhydride, which is an aliphatic tetracarboxylic acid dianhydride and aromatic tetracarboxylic acid dianhydride to a mixture of aromatic diamine, and said dioxotetrahydrofuran 3-methylcyclohexene- 1,2-dicarboxylic dianhydride is used in the amount of 50 to 99 mol % to the total amount of anhydrides.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: April 4, 2000
    Assignee: Korea Research Institute of Chemical Technology
    Inventors: Kil-Yeong Choi, Mi-Hie Yi, Moon-Young Jin, Jin-Tae Jung, Jeong-Ghi Koo, Jae-Eun Cho