Patents by Inventor Ralston Curtis

Ralston Curtis 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).

  • Microcapsules
    Patent number: 5674519
    Abstract: Microcapsules formed from urea-, thiourea- and/or melamine-formaldehyde prepolymers which are particularly useful in formulating agrochemicals.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: October 7, 1997
    Assignee: Novartis AG
    Inventors: Ralston Curtis, Rakesh Jain, David C. Creech, William L. Fitch
  • Process for producing microcapsules
    Patent number: 5462915
    Abstract: Microcapsules formed from urea-, thiourea- and/or melamine-formaldehyde prepolymers which are particularly useful in formulating agrochemicals.
    Type: Grant
    Filed: February 24, 1994
    Date of Patent: October 31, 1995
    Assignee: Sandoz Ltd.
    Inventors: Ralston Curtis, Rakesh Jain, David C. Creech, William L. Fitch
  • Stable oil-in-water emulsions
    Patent number: 4997642
    Abstract: Oil-in-water emulsions containing polyvinyl alcohol, surfactant and a salt with improved freeze-thaw and elevated temperature storage stability.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: March 5, 1991
    Assignee: Sandoz Ltd.
    Inventors: Ralston Curtis, Howard R. Brownell, Steven C. Papanu
  • Pesticidal formulation
    Patent number: 4469675
    Abstract: An oil-in-water pesticidal emulsion concentrate comprising an active ingredient selected from fluvalinate, permethrin, cypermethrin, deltamethrin, fenpropathrin and fenvalerate; polyvinyl alcohol; and optional amounts of surfactant and ethylene or propylene glycol having freeze-thaw stability, 50 degrees centigrade stability and water dispersability.
    Type: Grant
    Filed: December 2, 1982
    Date of Patent: September 4, 1984
    Assignee: Zoecon Corporation
    Inventors: Ralston Curtis, Steven C. Papanu
  • Novel pesticidal formulation
    Patent number: 4372943
    Abstract: An oil-in-water pesticidal emulsion concentrate comprising .alpha.-cyano-3-phenoxybenzyl-2-(2-chloro-4-trifluoromethylphenylamino)-3- methylbutanoate, polyvinyl alcohol and optional amounts of surfactant and ethylene or propylene glycol having freeze-thaw stability, 50 degrees centigrade stability and water dispersability.
    Type: Grant
    Filed: November 30, 1981
    Date of Patent: February 8, 1983
    Assignee: Zoecon Corporation
    Inventors: Steven C. Papanu, Ralston Curtis
  • Equine anthelmintic
    Patent number: 4098885
    Abstract: A novel composition comprising the equine anthelmintic, butonate, in a gel formulation and preparation thereof.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: July 4, 1978
    Assignee: Zoecon Corporation
    Inventor: Ralston Curtis