Patents by Inventor Syamalarao Evani

Syamalarao Evani 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).

  • Vinyl benzyl ethers and nonionic water soluble thickening agents prepared therefrom
    Patent number: 4029872
    Abstract: Nonionic water soluble thickening agents are prepared by copolymerizing about 1 to 5 mole percent of a vinyl benzyl ether having the formula ##STR1## and the balance to make 100 mole percent of acrylamide.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: June 14, 1977
    Assignee: The Dow Chemical Company
    Inventors: Syamalarao Evani, Frederick P. Corson
  • Vinyl benzyl ethers and nonionic water soluble thickening agents prepared therefrom
    Patent number: 4029874
    Abstract: Nonionic water soluble thickening agents are prepared by copolymerizing about 1 to 5 mole percent of a vinyl benzyl ether having the formula ##STR1## and the balance to make 100 mole percent of acrylamide.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: June 14, 1977
    Assignee: The Dow Chemical Company
    Inventors: Syamalarao Evani, Frederick P. Corson
  • Polymeric stabilized dispersions
    Patent number: 4025484
    Abstract: Dispersions of finely divided particulate solids in an organic liquid in which the solids are insoluble are stabilized by the addition of a polymeric dispersant having a degree of polymerization of about 10 to 100. An example of the polymeric dispersant is an interpolymer of styrene, maleic anhydride and a vinyl benzyl ether of ethoxylated nonyl phenol.
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: May 24, 1977
    Assignee: The Dow Chemical Company
    Inventors: Syamalarao Evani, Dennis McKeever, Russell J. Raymond
  • Aqueous thickening agents derived from vinyl benzyl ether polymers
    Patent number: 4008202
    Abstract: A novel polymer of a vinyl benzyl ether monomer and at least one other copolymerizable monomer, at least one of which other monomers has a carboxylic acid group, an anhydride group, a sulfate group, a sulfonate group or a hydroxyl group is disclosed. The vinyl benzyl ether monomer has the formula ##STR1## wherein R is hydrogen or methyl, m is about 10 to 100 and Y is ##STR2## where R.sub.1 is an alkyl, aralkyl or alkaryl hydrophobic group of 10 to about 22 carbon atoms, R.sub.2 is an alkyl group of 1 to about 22 carbon atoms and R.sub.3 is hydrogen or an alkyl group of 1 to about 22 carbon atoms, provided R.sub.2 and R.sub.3 in combination have at least 10 carbon atoms.
    Type: Grant
    Filed: June 29, 1972
    Date of Patent: February 15, 1977
    Assignee: The Dow Chemical Company
    Inventors: Syamalarao Evani, Frederick P. Corson
  • Magnetic tape and process of making a magnetic tape
    Patent number: 3976822
    Abstract: Magnetic tapes are made by applying to a backing film an aqueous dispersion of magnetic particles having dissolved therein cyclic sulfonium zwitterion monomers, magnetically orienting the magnetic particles, drying the coating and curing same. Upon removal of the water and/or moderate heating, the monomers polymerize to form a durable matrix having the magnetic particles dispersed therein.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: August 24, 1976
    Assignee: The Dow Chemical Company
    Inventors: Mary R. Thomas, Robert H. Lalk, Syamalarao Evani, Donald L. Schmidt
  • Vinyl benzyl ethers and nonionic water soluble thickening agents prepared therefrom
    Patent number: 3963684
    Abstract: Nonionic water soluble thickening agents are prepared by copolymerizing about 1 to 5 mole percent of a vinyl benzyl ether having the formula ##SPC1##And the balance to make 100 mole percent of acrylamide.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: June 15, 1976
    Assignee: The Dow Chemical Company
    Inventors: Syamalarao Evani, Frederick P. Corson