Patents by Inventor Lawrence John Grenner

Lawrence John Grenner 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).

  • Patent number: 3956008
    Abstract: Liquid colorant dispersions preferably comprising 5-70 weight percent colorant and 95-30% vehicle. The colorant is preferably a conventional pigment. The vehicle typically comprises two major components, (1) from 5 to 25 weight percent of a physically active, chemically inert solid in the form of fine particles (less than 90 microns in size), and, correspondingly, (2) from 95 to 75% of a surfactant system. It is often desirable to also include in the vehicle materials which serve as extenders and/or which modify vehicle properties such as rheology. Many times such materials are conventionally known as plasticizers although they do not function as such when used in the dispersions of this invention. The inert solid is preferably calcium carbonate. The preferred surfactant system is a sorbitan ester surfactant, such as sorbitan trioleate.
    Type: Grant
    Filed: February 27, 1974
    Date of Patent: May 11, 1976
    Assignees: Kark Finke OHG, Inmont Corporation
    Inventors: Siegfried Knepper, William M. Arnheim, III, Lawrence John Grenner