Patents by Inventor Hans Helfenberger

Hans Helfenberger 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).

  • Oil in water emulsion containing propetamphos
    Patent number: 4795640
    Abstract: A solvent-free oil-in-water emulsion of propetamphos comprising(a) 5 to 50% by weight of technical propetamphos in the form of droplets having a particle size of below 5 micron,(b) 1 to 8% by weight of a polyvinyl alcohol,(c) 1 to 3% by weight of a buffer, buffering the pH of the formulation to pH 6 to 7,(d) 1 to 2% by weight of a vegetable oil,(e) 0.5 to 2% by weight of an emulsifier(f) 0 to 8% by weight of an antifreezing agent(g) 0 to 0.1% by weight of an antifoaming agent (h) 0 to 0.1% by weight of a perfume,the balance being water, and a process of preparing such emulsion.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: January 3, 1989
    Assignee: Sandoz Ltd.
    Inventor: Hans Helfenberger