Patents by Inventor Hsien-Chyang Tsien

Hsien-Chyang Tsien 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).

  • 2-amino-5-nitrothiazole derived monoazo disperse dyes
    Patent number: 5652344
    Abstract: 2-amino-5-nitrothiazole derived compounds having the following formula: ##STR1## Wherein R1=H or alkyl of 1-4 carbons, R2=alkyl of 1-4 carbons or allyl group and R3=H, halogen or alkyl of 1-4 carbons.The invented compounds are suited for disperse dyestuffs and are able to dye polyester and cellulose acetate fibers with excellent build-up, exhaustion and sublimation fastness. The invention also provides a process for the preparation of the new compounds.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: July 29, 1997
    Assignee: Allied Industrial Corp., Ltd.
    Inventors: Hsien-Chyang Tsien, Kuan-Po Chu, Hung Chang
  • Disazo acid dyestuffs for polyamide fibers applicable in neutral solution
    Patent number: 5527887
    Abstract: Disazo acid dyestuff with the following general formula: ##STR1## wherein R represents H, C.sub.n H.sub.2n+1 wherein n is a natural number between 1 and 4, or (CH.sub.2).sub.m OR' wherein m is a natural number between 1 and 4 and R' represents C.sub.p H.sub.2p+1 wherein p is an integral number between 0 and 4; wherein R" represents H, CN or COOR wherein R has the same definition as above. The sulfo group may be at any position of the benzene ring.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: June 18, 1996
    Assignee: Allied Industrial Corp., Ltd.
    Inventors: Hsien-Chyang Tsien, Chen-Kung Chi, Hung Chang