Patents by Inventor David Previs

David Previs 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).

  • Use of DIPA-Esterquat Debonder For Tissue And Fluff Pulp Manufacturing
    Publication number: 20190040584
    Abstract: The present invention relates to cellulose fiber materials containing 0.01 to 0.5% by weight of ammonia compound comprising oxyalkyl radicals consisting of at least 3 carbon atoms which are biodegradable at a degree of at least 60% according the OECD 301F method and a process for producing debonded cellulose fibers.
    Type: Application
    Filed: March 1, 2017
    Publication date: February 7, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Deborah Lewis, Jörg Peggau, David Previs
  • Polymeric defoamer additive
    Patent number: 8507597
    Abstract: The present invention relates to a cost-effective and environmentally friendly polymeric defoamer formulation for use in various industrial applications that does not contain oil, EBS or free silicone.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: August 13, 2013
    Assignee: Kemira Chemicals, Inc.
    Inventors: James Martin, Robert Wilson, Scott Rosencrance, David Previs
  • POLYMERIC DEFOAMER ADDITIVE
    Publication number: 20120264863
    Abstract: The present invention relates to a cost-effective and environmentally friendly polymeric defoamer formulation for use in various industrial applications that does not contain oil, EBS or free silicone.
    Type: Application
    Filed: June 29, 2012
    Publication date: October 18, 2012
    Applicant: Kemira Chemicals, Inc.
    Inventors: James Martin, Robert Wilson, Scott Rosencrance, David Previs
  • Polymeric defoamer additive
    Patent number: 8236889
    Abstract: The present invention relates to a cost-effective and environmentally friendly polymeric defoamer formulation for use in various industrial applications that does not contain oil, EBS or free silicone.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: August 7, 2012
    Assignee: Kemira Chemicals, Inc.
    Inventors: James Martin, Robert Wilson, Scott Rosencrance, David Previs
  • POLYMERIC DEFOAMER ADDITIVE
    Publication number: 20100292380
    Abstract: The present invention relates to a cost-effective and environmentally friendly polymeric defoamer formulation for use in various industrial applications that does not contain oil, EBS or free silicone.
    Type: Application
    Filed: May 15, 2009
    Publication date: November 18, 2010
    Applicant: Kemira Chemicals, Inc.
    Inventors: James Martin, Robert Wilson, Scott Rosencrance, David Previs