Patents by Inventor Maochun Ye

Maochun Ye 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).

  • HPLC carbon with narrow particle size distribution
    Patent number: 11806693
    Abstract: Methods for producing porous graphic carbon microspheres having improved separation properties over conventional porous graphitic carbons. The methods include dispersing a monovinyl aromatic monomer, a polyvinyl aromatic monomer, and an initiator in a solvent, contacting porous silica microspheres with the monomer dispersion for a time sufficient for the monomers to coat the porous silica microspheres, polymerizing the monomers to form copolymer coated microspheres, sulfonating the copolymer, pyrolyzing the sulfonated copolymer, digesting the carbon microspheres to dissolve the silica leaving porous carbon microspheres, pyrolyzing the porous carbon microspheres, and graphitizing the porous carbon microspheres to form porous graphitic carbon microspheres. Further provided are improved porous graphitic carbon microspheres and chromatography columns including the improved porous graphitic carbon microspheres described herein.
    Type: Grant
    Filed: June 16, 2021
    Date of Patent: November 7, 2023
    Assignee: Sigma-Aldrich Co. LLC
    Inventors: William R. Betz, Michael J. Keeler, Curtis W. Frantz, Jay M. Jones, William Maule, Kenneth G. Espenschied, Cory E. Muraco, Clinton Corman, Maochun Ye
  • HPLC CARBON WITH NARROW PARTICLE SIZE DISTRIBUTION
    Publication number: 20210394156
    Abstract: Methods for producing porous graphic carbon microspheres having improved separation properties over conventional porous graphitic carbons. The methods include dispersing a monovinyl aromatic monomer, a polyvinyl aromatic monomer, and an initiator in a solvent, contacting porous silica microspheres with the monomer dispersion for a time sufficient for the monomers to coat the porous silica microspheres, polymerizing the monomers to form copolymer coated microspheres, sulfonating the copolymer, pyrolyzing the sulfonated copolymer, digesting the carbon microspheres to dissolve the silica leaving porous carbon microspheres, pyrolyzing the porous carbon microspheres, and graphitizing the porous carbon microspheres to form porous graphitic carbon microspheres. Further provided are improved porous graphitic carbon microspheres and chromatography columns including the improved porous graphitic carbon microspheres described herein.
    Type: Application
    Filed: June 16, 2021
    Publication date: December 23, 2021
    Inventors: William R. Betz, Michael J. Keeler, Curtis W. Frantz, Jay M. Jones, William Maule, Kenneth G. Espenschied, Cory E. Muraco, Clinton Corman, Maochun Ye