Patents by Inventor Yvonne O. Dunn

Yvonne O. Dunn 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).

  • Anionic and nonionic solution polymers for paint detackification
    Patent number: 5215668
    Abstract: Oversprayed paint in a paint spray operation is detackified by dosing the water of the waste water system of such operation with a composition comprising an amphoteric polymer and aluminum salts. The amphoteric polymer contains at least about 10 mole percent of cationic mer units of monoethylenically unsaturated monomer and at least 1 mole percent of anionic mer units. The aluminum salt preferred is aluminum sulfate, or its hydrates, for example alum. The amphoteric polymers preferably contain DMAEM, DMAEM.multidot.H.sub.2 SO.sub.4, DMAEM.multidot.MCQ, or mixtures thereof, with acrylic acid, methacrylic acid, AMPS, or mixtures thereof. The amphoteric polymers may also contain neutral monomers such as (meth)acrylamide.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: June 1, 1993
    Assignee: Nalco Chemical Company
    Inventors: Bhupati R. Bhattacharyya, deceased, Shu-Jen W. Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn
  • Method for detackifying oversprayed paint
    Patent number: 5192449
    Abstract: Oversprayed paint in a paint spray operation is detackified by dosing the water of the waste water system of such operation with a composition comprising a polymer and aluminum sulfate. The polymer contains at least about 10 mole percent of cationic mer units of monoethylenically unsaturated monomer.
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: March 9, 1993
    Assignee: Nalco Chemical Company
    Inventors: Shu-Jen W. Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn, Uma Bhattacharyya, Bhupati R. Bhattacharyya
  • Method for detackifying oversprayed paint
    Patent number: 5116514
    Abstract: Oversprayed paint in a paint spray operation is detackified by dosing the water of the waste water system of such operation with a composition comprising a polymer and aluminum sulfate. The polymer contains at least about 10 mole percent of cationic mer units of monoethylenically unsaturated monomer.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: May 26, 1992
    Assignee: Nalco Chemical Company
    Inventors: Bhupati R. Bhattacharyya, deceased, Shu-Jen Huang, Chandrashekar S. Shetty, Nang T. Bui, Yvonne O. Dunn
  • Cationic polymers for sludge dewatering
    Patent number: 5093413
    Abstract: Water-in-oil emulsion polymers of cationic acrylamides to which are added small quantities of a hydroxyalkyl methacrylate and sodium formate. These polymers are useful as flocculants in sludge dewatering processes.
    Type: Grant
    Filed: March 4, 1991
    Date of Patent: March 3, 1992
    Assignee: Nalco Chemical Company
    Inventors: Bhupati R. Bhattacharyya, deceased, John W. Sparapany, Yvonne O. Dunn, Foster Michael H.