Patents by Inventor Wangcheng Liu

Wangcheng 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).

  • Environmentally friendly cellulose waste recycling
    Patent number: 11884751
    Abstract: Techniques for chemically recycling cellulose waste such as cotton are disclosed herein. In one embodiment, a method includes hydrolyzing a cotton waste and dissolving cellulose in the hydrolyzed cotton waste in an aqueous solution containing an alkali and one or more of urea ((NH2)2CO), polyethylene glycol, or thiourea (SC(NH2)2) to produce another aqueous solution containing dissolved cellulose. Then the another aqueous solution containing the dissolved cellulose can be extruded into a coagulation bath to coalesce the dissolved cellulose in the extruded solution, thereby reforming the dissolved cellulose from the cotton waste into a regenerated fiber.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: January 30, 2024
    Assignee: Washington State University
    Inventors: Hang Liu, Jinwen Zhang, Wangcheng Liu
  • METHOD FOR USING CO2-BASED POLYOL ON POLYURETHANE FOAM TO IMPROVE REPROCESSING-ABILITY IN HOT PROCESS WITH SUPERIOR RECYCLING RATE
    Publication number: 20230406992
    Abstract: A recyclable polyurethane foam is produced by reacting a carbon dioxide-based polyol-containing composition and an isocyanate composition. The polyurethane foam may include a molar ratio of active hydrogen to isocyanate groups of 1:0.9. The polyurethane foam may include a catalyst at about greater than or equal to about 0.5 to less than or equal to about 1.5 parts by weight percent.
    Type: Application
    Filed: June 21, 2022
    Publication date: December 21, 2023
    Applicants: Ford Motor Company, Washington State University
    Inventors: Alper Kiziltas, Deborah Frances Mielewski, Wangcheng Liu, Jinwen Zhang
  • METHOD FOR USING DISULFIDE REACTIVE CHEMICAL ON POLYURETHANE FOAM TO IMPROVE REPROCESSABILITY IN HOT PRESS PROCESS WITH SUPERIOR RECYCLING RATE
    Publication number: 20230406988
    Abstract: A recyclable polyurethane foam is produced by reacting a disulfide reactive chemical-based polyol-containing composition and an isocyanate composition. The polyurethane foam may include a molar ratio of the disulfide reactive chemical of greater than or equal to about 2:1 mol %, 4:1 mol %, or 6:1 mol %, wherein the ratio equates to the molar ratio of hydroxyl groups of the disulfide reactive chemical versus the molar ratio of hydroxyl groups of the polyol.
    Type: Application
    Filed: June 21, 2022
    Publication date: December 21, 2023
    Applicants: Ford Motor Company, Washington State University
    Inventors: Alper Kiziltas, Deborah Frances Mielewski, Wangcheng Liu, Jinwen Zhang
  • ENVIRONMENTALLY FRIENDLY CELLULOSE WASTE RECYCLING
    Publication number: 20200199257
    Abstract: Techniques for chemically recycling cellulose waste such as cotton are disclosed herein. In one embodiment, a method includes hydrolyzing a cotton waste and dissolving cellulose in the hydrolyzed cotton waste in an aqueous solution containing an alkali and one or more of urea ((NH2)2CO), polyethylene glycol, or thiourea (SC(NH2)2) to produce another aqueous solution containing dissolved cellulose. Then the another aqueous solution containing the dissolved cellulose can be extruded into a coagulation bath to coalesce the dissolved cellulose in the extruded solution, thereby reforming the dissolved cellulose from the cotton waste into a regenerated fiber.
    Type: Application
    Filed: May 11, 2018
    Publication date: June 25, 2020
    Inventors: Hang Liu, Jinwen Zhang, Wangcheng Liu