Patents by Inventor Feng-hsu Li

Feng-hsu Li 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).

  • Method for purification of terpenoid amino alcohol derivatives
    Patent number: 11739050
    Abstract: Provided is a method of purifying a terpenoid amino alcohol derivative, including providing a crude terpenoid amino alcohol derivative; performing an acid/base crystallization process of the crude terpenoid amino alcohol derivative to obtain an organic salt; and reacting the organic salt with NaOH and toluene to obtain a purified terpenoid amino alcohol derivative. Also provided is a method of preparing p-mentha-2,8-diene-1-ol from the purified terpenoid amino alcohol derivative.
    Type: Grant
    Filed: September 7, 2021
    Date of Patent: August 29, 2023
    Assignee: SCI PHARMTECH INC.
    Inventors: Chen-Yi Kao, Feng-Hsu Li
  • METHOD FOR PURIFICATION OF TERPENOID AMINO ALCOHOL DERIVATIVES
    Publication number: 20230103071
    Abstract: Provided is a method of purifying a terpenoid amino alcohol derivative, including providing a crude terpenoid amino alcohol derivative; performing an acid/base crystallization process of the crude terpenoid amino alcohol derivative to obtain an organic salt; and reacting the organic salt with NaOH and toluene to obtain a purified terpenoid amino alcohol derivative. Also provided is a method of preparing p-mentha-2,8-diene-1-ol from the purified terpenoid amino alcohol derivative.
    Type: Application
    Filed: September 7, 2021
    Publication date: March 30, 2023
    Applicant: SCI PHARMTECH INC.
    Inventors: Chen-Yi Kao, Feng-Hsu Li
  • Method for preparing cannabinoids
    Patent number: 10981849
    Abstract: Provided is a method for preparing synthetic cannabidiol, including hydrolysis-decarboxylation of a compound represented by formula (II) in a solvent-free state under atmospheric pressure. The method further includes preparation of the compound represented by formula (II). The method provides a safe, economical, environmentally friendly and scalable method for synthetic preparation of cannabidiol.
    Type: Grant
    Filed: February 20, 2020
    Date of Patent: April 20, 2021
    Assignee: SCI PHARMTECH INC.
    Inventors: Heng-Yen Wang, Feng-Hsu Li, Zhi-Jie Yang, Hsin-Yi Huang
  • Process for preparation of optically pure -substituted-3-methoxypropionic acid derivatives
    Patent number: 9718765
    Abstract: A method of producing optically pure N-substituted-3-methoxy propionic acid is provided, which includes the steps of: reacting N-substituted-3-methoxy propionic acid represented by formula (III): with a chiral amine in a solvent to obtain a diastereomeric salt represented by formula (IV): subjecting the diastereomeric salt to a sequential washing process to obtain the optically pure N-substituted-3-methoxy propionic acid represented by one of formulae (Ia) and (Ib): wherein R1 is selected from the group consisting of C1-5 alkyl, C1-6 alkoxy and C6-10 aryloxy group, and R2 is selected from the group consisting of C2-5 alkyl, C6-8 cycloalkyl and C6-10 aryl.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: August 1, 2017
    Assignee: SCI Pharmtech, Inc.
    Inventors: Bo-Fong Chen, Yen-Chi Su, Yen-Wei Li, Feng-Hsu Li, Chen-Wei Huang
  • Preparation of Duloxetine® hydrochloride using optically active methylhydroxylaminopropanol compound as an intermediate
    Patent number: 8957227
    Abstract: The present invention provides a process for preparing duloxetine hydrochloride with higher yield and lower cost.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: February 17, 2015
    Assignee: SCI Pharmtech, Inc.
    Inventors: Bo-Fong Chen, Feng-Ju Lu, Jinun-Ban Yeh, Wei-Chyun Wong, Feng-hsu Li, Yen-Wei Li, Yeh-Chi Su
  • PREPARATION OF DULOXETINE HYDROCHLORIDE USING OPTICALLY ACTIVE METHYLHYDROXYLAMINOPROPANOL COMPOUND AS AN INTERMEDIATE
    Publication number: 20140005414
    Abstract: The present invention provides a process for preparing duloxetine hydrochloride with higher yield and lower cost.
    Type: Application
    Filed: August 29, 2013
    Publication date: January 2, 2014
    Applicant: SCI Pharmtech, Inc.
    Inventors: Bo-Fong Chen, Feng-Ju Lu, Jinun-Ban Yeh, Wei-Chyun Wong, Feng-hsu Li, Yen-Wei Li, Yeh-Chi Su