Patents by Inventor Cheryl R. Allen

Cheryl R. Allen 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).

  • Silcone-containing polymer having oxygen permeability suitable for ophalmic applications
    Patent number: 5770669
    Abstract: Copolymers formed from dimethacrylates of polyalkylene glycols and vinylic reactive silicones having up to 20 silicon atoms in the substantial absence of additional cross-linking agents. The copolymers may include a hydrophilicity-modifying monomer. The preferred silicon is TRIS (i.e., 3-methacryloxypropyl tris(trimethylsiloxy) silane), while the preferred polyalkylene glycol is polypropylene glycol dimethacrylate. The copolymers are especially suited to use in the fabrication of soft contact lenses because of the good durability and high oxygen permeability and transmissibility. Oxygen transmissibilities of greater than 70 barrers/mm are preferred.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: June 23, 1998
    Assignee: CIBA Vision Corporation
    Inventors: J. Richard Robertson, Cheryl R. Allen