Patents by Inventor Stephen O. Zhou

Stephen O. Zhou 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).

  • Water miscible non-hydrolyzable cross-linkers and high refractive index hydrogels prepared therewith
    Patent number: 5439950
    Abstract: Non-hydrolyzable, hydrophilic, heterocyclic cross-linking agents for cross-linking vinyl comonomers are provided. The cross-linked copolymers form optically transparent, high water content, and high refractive index hydrogels having long term stability which are useful as intraocular lenses and superabsorbents. The crosslinkers are selected from 4,6 divinyl pyrimidine, 2,5 divinyl pyrazine, 1,4 divinyl imidazole and 1,5 divinyl imidazole.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: August 8, 1995
    Assignee: Kabi Pharmacia Ophthalmics, Inc.
    Inventors: Xiugao Liao, Yading Wang, Stephen O. Zhou, Thomas P. Richards
  • Process for fabricating full sized expansile hydrogel intraocular lenses
    Patent number: 5316704
    Abstract: Expansile hydrogel intraocular lenses are heated above their elastic deformation temperatures and deformed into an elongated configuration having at least one reduced dimension suitable for insertion through a small surgical incision. The lenses are allowed to cool in this configuration and retain the deformed shape prior to surgical implantation. Following implantation the lenses hydrate into an enlarged elastic form reassuming the original lens configuration of full capsule size.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: May 31, 1994
    Assignee: Kabi Pharmacia Ophthalmics Inc.
    Inventors: Yading Wang, Stephen O. Zhou, Thomas P. Richards