Patents Assigned to Director of National Research Institute of Tea
  • Process for producing catechins
    Patent number: 4248789
    Abstract: A process for producing catechins from tannic substance which has been extracted from tea leaves. An aqueous solution of the extract is admixed with an aqueous solution of caffeine to form a liquid-containing mixture of free catechins and a precipitated mixture of ester-type catechins. The caffeine is then removed from the aforesaid mixtures, and the respective mixtures fractionated to obtain epicatechin, epigallocatechin, epicatechin gallate, and epigallocatechin gallate.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: February 3, 1981
    Assignee: Director of National Research Institute of Tea
    Inventor: Fumio Okada
  • Plant viral disease inhibitor
    Patent number: 4105784
    Abstract: A plant viral disease inhibitor containing as an active ingredient thereof at least one material selected from the group consisting of theaflavin and its derivatives represented by the general formula: ##STR1## wherein R is hydrogen or ##STR2## and their analogues.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: August 8, 1978
    Assignee: Director of National Research Institute of Tea
    Inventor: Fumio Okada