Patents by Inventor Fu-Pao Tsao

Fu-Pao Tsao 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).

  • Contact lens case
    Patent number: 5383550
    Abstract: A case for carrying and disinfecting contact lenses has a reservoir portion for holding a lens and solution, a plurality of projections extending from the reservoir floor upon which the lens may be positioned, and, a basket portion hingedly attached to the case and capable of being folded over the projections to hold the lens in place within the reservoir. A cap is provided for sealing the reservoir.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: January 24, 1995
    Assignee: Ciba-Geigy Corporation
    Inventor: Fu-Pao Tsao
  • Peroxide disinfection method
    Patent number: 5306352
    Abstract: A method of disinfecting a hydrogen peroxide stable material by contacting said material with a hydrogen peroxide containing solution and a hydrogen peroxide decomposition means adapted to permit said material to have a cumulative (% peroxide).multidot.(min) exposure from the time said decomposition means contacts said hydrogen peroxide containing solution over a period not exceeding 12 hours of at least 20% (peroxide).multidot.(min). Also, disclosed are devices and components thereof whereby said method can be achieved.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: April 26, 1994
    Assignee: Ciba-Geigy Corporation
    Inventors: Paul Nicolson, Kenneth R. Seamons, Fu-Pao Tsao, Larry A. Alvord, Earl C. McCraw
  • Rapid ophthalmic glycol/lower alkanol cleaning and disinfecting solution and method
    Patent number: 5298182
    Abstract: A contact lens polymer material cleaning and disinfecting solution has about 21% by weight of a C.sub.3 -C.sub.8 alkylene glycol, about 16% by weight of a lower alkanol, and 5% by weight of an ophthalmic device material compatible surfactant, about 1% by weight of a pH adjusting or regulating agent, about 1% by weight of a tonicity builder, about 0.1% of a viscosity enhancing agent, and water.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: March 29, 1994
    Assignee: Ciba-Geigy Corporation
    Inventors: Fu-Pao Tsao, Susan A. Littlefield, John H. Stone
  • Method of imparting antimicrobial acitivity to an ophthalmic composition
    Patent number: 5256420
    Abstract: A method of imparting antimicrobial activity to an ophthalmic composition includes the step of adding a polyquaternary ammonium salt to the composition. The method may be employed, for example, for disinfecting a contact lens or preserving a solution, ointment or suspension.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: October 26, 1993
    Assignee: Ciba-Geigy Corporation
    Inventors: Fu-Pao Tsao, Paul C. Nicolson, Susan A. Littlefield
  • Antimicrobial ophthalmic solutions containing dodecyl-dimethyl-(2 phenoxyethyl)-ammonium bromide and methods of using the same
    Patent number: 5165918
    Abstract: The invention relates to the use of dodecyl-dimethyl-(2 phenoxyethyl)-ammonium bromide as an antimicrobial agent to be a preservative for ophthalmic drug solutions, in disinfecting solutions, as well as in preservatives for aqueous ocular solutions for contact lenses.
    Type: Grant
    Filed: January 5, 1990
    Date of Patent: November 24, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Barbara L. Heyl, Lynn C. Winterton, Fu-Pao Tsao
  • Buoyancy mediated control of catalytic reaction
    Patent number: 5078798
    Abstract: A method of carrying out a reaction in a solution catalytically comprising contacting a solid catalytically active material and a solution in which a catalytic reaction is to be carried out wherein the catalytic reaction yields a gas which adheres to the catalyst particles such that as the reaction is substantially complete in the immediate environment of the catalyst, the catalyst migrates to a reactant richer portion.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: January 7, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Paul Nicolson, Kenneth R. Seamons, Fu-Pao Tsao
  • Stabilized hydrogen peroxide contact lens disinfecting solution
    Patent number: 4812173
    Abstract: Stabilized hydrogen peroxide disinfecting solutions containing diphosphonic acids (such as hydroxyethylidene diphosphonic acid), and glycerin are disclosed along with a disinfection method.
    Type: Grant
    Filed: May 1, 1987
    Date of Patent: March 14, 1989
    Assignee: Ciba-Geigy Corporation
    Inventors: Fu-Pao Tsao, M. Alicja Sills