Patents by Inventor Robert P. Cavender

Robert P. Cavender 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).

  • Flow property shelf life of PVC dry blend powders
    Patent number: 5233022
    Abstract: A method of cooling a PVC dry blend powder in a vessel by spraying a liquified inert gas into the vessel such that the liquified inert gas contacts the powder. The PVC dry blend powder is made by mixing a powdered PVC resin with ingredients selected from the group consisting of plasticizers, stabilizers, and pigments in a mixing vessel by using a heating and mixing cycle followed by a liquified inert gas cooling cycle. The flow properties of PVC dry blend powder made by this method have an improved shelf life.
    Type: Grant
    Filed: August 26, 1991
    Date of Patent: August 3, 1993
    Assignee: United Technologies Automotive, Inc.
    Inventors: Joseph T. Donatti, Robert P. Cavender, Robert J. Stein, James Carter