Patents by Inventor Richard Govan

Richard Govan 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 making coated silicone hydrogel contact lenses
    Patent number: 11459479
    Abstract: The invention is generally related to a method for producing coated silicone hydrogel contact lenses each of which has a hydrogel coating thereon and a relative high resistance to uptakes of polycationic antimicrobials as characterized by having a polyquaternium-1-uptake of less than 0.40 micrograms/lens. The hydrogel coating is formed by covalently attached a hydrophilic polymeric material onto a base coating of a polyanionic polymer on a SiHy contact lens. In this method, lower polyquaternium-1-uptake is achieved by using a rinse solution with a higher pH and/or a higher ionic strength (higher salt concentration) for rinsing a treated silicone hydrogel contact lens with a base coating of polyanionic polymer.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: October 4, 2022
    Assignee: Alcon Inc.
    Inventors: Yongxing Qiu, Chung-Yuan Chiang, Newton T. Samuel, Richard Govan, Ciara Dauenhauer
  • Method for producing MPS-compatible water gradient contact lenses
    Patent number: 10830923
    Abstract: The invention is related to a process for producing contact lenses that not only comprise a water gradient structural configurations, but also have a minimized uptakes of polyquaternium-1 and a long-lasting surface hydrophilicity and wettability even after being undergone a simulated 30-days lens care regime.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: November 10, 2020
    Assignee: Alcon Inc.
    Inventors: Yongxing Qiu, Kasey Jon Minick, John Dallas Pruitt, Newton T. Samuel, Chung-Yuan Chiang, Kelly Kayi Tallau, Matthew McCollum, Richard Govan
  • METHOD FOR MAKING COATED SILICONE HYDROGEL CONTACT LENSES
    Publication number: 20200172756
    Abstract: The invention is generally related to a method for producing coated silicone hydrogel contact lenses each of which has a hydrogel coating thereon and a relative high resistance to uptakes of polycationic antimicrobials as characterized by having a polyquaternium-1-uptake of less than 0.40 micrograms/lens. The hydrogel coating is formed by covalently attached a hydrophilic polymeric material onto a base coating of a polyanionic polymer on a SiHy contact lens. In this method, lower polyquaternium-1-uptake is achieved by using a rinse solution with a higher pH and/or a higher ionic strength (higher salt concentration) for rinsing a treated silicone hydrogel contact lens with a base coating of polyanionic polymer.
    Type: Application
    Filed: May 30, 2019
    Publication date: June 4, 2020
    Inventors: Yongxing Qiu, Chung-Yuan Chiang, Newton T. Samuel, Richard Govan, Ciara Dauenhauer
  • METHOD FOR PRODUCING MPS-COMPATIBLE WATER GRADIENT CONTACT LENSES
    Publication number: 20190176417
    Abstract: The invention is related to a process for producing contact lenses that not only comprise a water gradient structural configurations, but also have a minimized uptakes of polyquaternium-1 and a long-lasting surface hydrophilicity and wettability even after being undergone a simulated 30-days lens care regime.
    Type: Application
    Filed: November 29, 2018
    Publication date: June 13, 2019
    Inventors: Yongxing Qiu, Kasey Jon Minick, John Dallas Pruitt, Newton T. Samuel, Chung-Yuan Chiang, Kelly Kayi Tallau, Matthew McCollum, Richard Govan