Patents by Inventor John Robert Duchek

John Robert Duchek 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).

  • Cannabinoid crystalline derivatives and process of cannabinoid purification
    Patent number: 7402686
    Abstract: ?9 tetrahydrocannabinol (THC) esters comprising the reaction product of THC with at least one aryl sulfonyl chloride in the presence of at least one tertiary amine. The resulting aryl sulfonic THC esters are highly crystalline and stable at room temperature in air, allowing for indefinite storage. The aryl sulfonic THC esters can be recrystallized for purification, and then hydrolyzed to recover the purified THC.
    Type: Grant
    Filed: November 6, 2003
    Date of Patent: July 22, 2008
    Assignee: Mallinckrodt Inc.
    Inventor: John Robert Duchek