Patents by Inventor Popke Wietsma

Popke Wietsma 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).

  • Heat sealable PVC blends
    Patent number: 5166269
    Abstract: Blends of styrene-butadiene rubber and PVC latices in a dry weight ratio of 45:10 to 55:70 are useful to form heat sealable films. The mixture does not contain plasticizers and thus reduces environmental concerns during processing. The resulting film have good clarity and flexibility and may be used to seal textiles, non-wovens and boards.
    Type: Grant
    Filed: August 23, 1989
    Date of Patent: November 24, 1992
    Assignee: BASF Corporation
    Inventors: Popke Wietsma, Joy Stam
  • Thickeners
    Patent number: 4657943
    Abstract: A thickening agent having improved resistance under alkaline conditions comprises a synergistic mixture of an acrylate polymer and bentonite. These thickening agents are useful in textile padding and drilling muds.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: April 14, 1987
    Assignee: Polysar Financial Services S.A.
    Inventor: Popke Wietsma
  • Preparation of impregnated fibers
    Patent number: 4081318
    Abstract: A process is shown wherein an aqueous binder composition, preferably a latex binder composition, is foamed and applied as a layer of controlled thickness on a transfer roll rotating above a moving fibrous web but out of touch with the latter while suction is applied below the web in the region of the roll to draw the foam off the roll and into the web. The web is subsequently dried. The process produces webs of improved hand because impregnation is accomplished with only the foam coming into contact with the web.
    Type: Grant
    Filed: July 16, 1976
    Date of Patent: March 28, 1978
    Assignee: Chemische Industrie AKU-Goodrich B.V.
    Inventor: Popke Wietsma
  • Process for the impregnation of a wet fiber web with a heat sensitized foamed latex binder
    Patent number: 4018647
    Abstract: A fiber web made by the wet method on a paper making machine is impregnated with a heat sensitized, foamed latex binder as the web passes through a screening area of the paper making machine.
    Type: Grant
    Filed: June 10, 1974
    Date of Patent: April 19, 1977
    Assignee: Chemische Industrie AKU-Goodrick B.V.
    Inventor: Popke Wietsma
  • Latex for forming non-gelling vulcanizable solid foam
    Patent number: 3948822
    Abstract: A process for the preparation of a latex composition which is processable into a non-gelling vulcanizable solid foam and a process for coating a substrate with said foam.
    Type: Grant
    Filed: July 13, 1973
    Date of Patent: April 6, 1976
    Assignee: Chemische Industrie AKU-Goodrich B.V.
    Inventor: Popke Wietsma