Patents by Inventor Floyd L. Allen

Floyd L. 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).

  • Welan gum in cement compositions
    Patent number: 5004506
    Abstract: Cement compositions, i.e., mortar, structured concrete, pre-cast concrete, and oilfield cement, comprising 0.01-0.9% (wt/wt) welan gum are described.
    Type: Grant
    Filed: April 2, 1990
    Date of Patent: April 2, 1991
    Assignee: Merck & Co., Inc.
    Inventors: Floyd L. Allen, Glen H. Best, Thomas A. Lindroth
  • Welan gum in cement compositions
    Patent number: 4963668
    Abstract: Low viscosity welan gum having a 5% (wt.) aqueous solution viscosity of 100 cP and process for preparation of such are described.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: October 16, 1990
    Assignee: Merck & Co., Inc.
    Inventors: Floyd L. Allen, Glen H. Best, Thomas A. Lindroth