Patents by Inventor Mildred C. Richards

Mildred C. Richards 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).

  • Pipe coating compositions
    Patent number: 5462780
    Abstract: Improved thermoplastic adhesive liquid coatings adapted for use as a primer coating for inground pipelines, which coatings include an amphipathic metal complexing reagent in an amount effective to provide protection against cathodic disbondment, the improvement being the bonding to the thermoplastic moiety of an anhydride in an amount sufficient to provide still further protection against degradative environmental forces; and novel protective pipewrap systems including same.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: October 31, 1995
    Assignee: The Kendall Company
    Inventor: Mildred C. Richards
  • Repulpable tape
    Patent number: 4992501
    Abstract: Repulpable tapes, their composition and the process of making the same, which retain adhesion and tack over a wide range of humidity and temperature, are provided. The improved composition comprises the addition of 10 to 50 parts by weight of a partially to fully hydrogenated rosin and at least 1 part by weight of polyethylene glycol.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: February 12, 1991
    Assignee: The Kendall Company
    Inventors: Robert Hanninen, Shiro G. Takemoto, Mildred C. Richards
  • Nonionic monomeric emulsion stabilizers
    Patent number: 4198520
    Abstract: Compounds containing a lipophilic radical, a polyethyleneoxy group and an ethylenically unsaturated radical are disclosed. The compounds are useful as nonionic monomeric emulsion stabilizers.
    Type: Grant
    Filed: October 21, 1977
    Date of Patent: April 15, 1980
    Assignee: The Kendall Company
    Inventors: Carlos M. Samour, Mildred C. Richards
  • Process of forming a polymeric emulsion which comprises copolymerizing in aqueous dispersion an ethylenically-unsaturated monomer containing quaternary nitrogen
    Patent number: 4064091
    Abstract: A novel class of monomeric emulsion stabilizers consists of certain types of ethylenically unsaturated radicals covalently linked to a quaternary nitrogen atom which in turn is covalently linked to a lipophilic radical. Such monomers will polymerize with other ethylenically unsaturated radicals forming self-stabilized, surfactant-free polymeric dispersions.
    Type: Grant
    Filed: December 19, 1975
    Date of Patent: December 20, 1977
    Assignee: The Kendall Co.
    Inventors: Carlos M. Samour, Mildred C. Richards
  • Monomeric emulsion stabilizers derived from alkyl/alkenyl succinic anhydride
    Patent number: 4051158
    Abstract: Quaternary ammonium salts having a lipophilic group covalently linked to the quaternary nitrogen through hydroxysuccinyloxy or hydroxysuccinylamino radicals are disclosed. These quaternary ammonium salts are useful as monomeric emulsion stabilizers.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: September 27, 1977
    Assignee: The Kendall Company
    Inventors: Carlos M. Samour, Mildred C. Richards
  • Monomeric emulsion stabilizers
    Patent number: 4011259
    Abstract: A novel class of monomeric emulsion stabilizers consists of certain types of ethylenically-unsaturated radicals covalently linked to a quaternary nitrogen atom which in turn is covalently linked to a lipophilic radical. Such monomers will polymerize with other ethylenically-unsaturated radicals forming self-stabilized, surfactant-free polymeric dispersions.
    Type: Grant
    Filed: July 11, 1975
    Date of Patent: March 8, 1977
    Assignee: The Kendall Company
    Inventors: Carlos M. Samour, Mildred C. Richards
  • Dental compositions having improved color stability
    Patent number: 3991008
    Abstract: Dental compositions having improved color stability are prepared by employing a redox catalyst system consisting of a hydroperoxide oxidizing agent and a substituted thiourea reducing agent. The composition also comprises a methacrylate monomer, and optionally, a filler and a coupling agent.
    Type: Grant
    Filed: August 12, 1974
    Date of Patent: November 9, 1976
    Assignee: The Kendall Company
    Inventors: Samuel C. Temin, Mildred C. Richards
  • Monomeric emulsion stabilizers derived from alkyl/alkenyl succinic anhydride
    Patent number: 3959355
    Abstract: Quaternary ammonium salts having a lipophilic group covalently linked to the quaternary nitrogen through hydroxysuccinyloxy or hydroxysuccinylamino radicals are disclosed. These quaternary ammonium salts are useful as monomeric emulsion stabilizers.
    Type: Grant
    Filed: June 6, 1974
    Date of Patent: May 25, 1976
    Inventors: Carlos M. Samour, Mildred C. Richards
  • Monomeric emulsion stabilizers
    Patent number: 3936492
    Abstract: A novel class of monomeric emulsion stabilizers consists of certain types of ethylenically-unsaturated radicals covalently linked to a quaternary nitrogen atom which in turn is covalently linked to a lipophilic radical. Such monomers will polymerize with other ethylenically-unsaturated radicals forming self-stabilized, surfactant-free polymeric dispersions.
    Type: Grant
    Filed: August 9, 1974
    Date of Patent: February 3, 1976
    Assignee: The Kendall Company
    Inventors: Carlos M. Samour, Mildred C. Richards