Patents by Inventor Michael D. Roznowski

Michael D. Roznowski 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).

  • Fluid loss control additives for oil well cementing compositions
    Patent number: 4933378
    Abstract: A cementing composition useful in cementing oil, gas and water wells, comprising water, hydraulic cement and an effective amount of water soluble fluid loss additive comprised of a copolymer of acrylamide/vinyl imidazole and derivatives thereof in a weight percent ratio of from about 95:5 to 5:95, said copolymer having a molecular weight range of from about 100,000 to 3,000,000. The composition can also optionally include a dispersant such as sodium or potassium salts or a sulfonated naphthalene formaldehyde condensate.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: June 12, 1990
    Assignee: BASF Corporation
    Inventors: Clare H. Kucera, Stefano C. Crema, Michael D. Roznowski, Gerd Konrad, Heinrich Hartman
  • Fluid loss control additives for oil well cementing compositions
    Patent number: 4931489
    Abstract: A cementing composition useful in cementing oil, gas and water wells, comprising water, hydraulic cement and an effective amount of water soluble fluid loss additive comprised of a copolymer of acrylamide/vinyl imidazole and derivatives thereof in a weight percent ratio of from about 95:5 to 5:95, said copolymer having a molecular weight range of from about 100,000 to 3,000,000. The composition can also optionally include a dispersant such as sodium or potassium salts or a sulfonated naphthalene formaldehyde condensate.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: June 5, 1990
    Assignee: BASF Corporation
    Inventors: Clare H. Kucera, Stefano C. Crema, Michael D. Roznowski, Gerd Konrad, Heinrich Hartmann