Patents by Inventor Kang-Chien Liu

Kang-Chien Liu 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).

  • Process for preparing 3-(1H-tetrazol-5-yl)-4(3H)-quinazolinone
    Patent number: 4929728
    Abstract: A process for preparing 3-(1H-tetrazol-5-yl)-4(3H)-quinazolinone ammonium salts of the formula I: ##STR1## wherein: R is hydrogen, halogen, C.sub.1 -C.sub.3 alkyl or C.sub.1 -C.sub.3 alkoxy,which process comprises:reacting ethyl N-(1H-tetrazol-5-yl) formimidate in an inert solvent with substituted anthranilamide of the formula IV ##STR2## wherein R is as defined above. The process is simpler than prior processes for preparing the same compounds and thus is economically valuable.
    Type: Grant
    Filed: November 2, 1989
    Date of Patent: May 29, 1990
    Assignee: National Science Council
    Inventors: Ji-Wang Chern, Kang-Chien Liu, Chia-Yin Chen