Patents by Inventor Robert C. Ringwood

Robert C. Ringwood 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).

  • Liquid organotinthioalkanol stabilizer compositions and vinyl halide resin compositions containing the same
    Patent number: 5109046
    Abstract: This invention relates to heat and light stabilizer compositions for vinyl halide resin compositions comprising organotinthioalkanol compounds that are stabilized against gelation and precipitation, to methods of preparing the stabilizer compositions, and to stabilized vinyl halide resin compositions.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: April 28, 1992
    Assignee: Atochem North America, Inc.
    Inventors: William A. Larkin, Robert C. Ringwood, Matthew T. Stershic
  • Stabilized pvc resins
    Patent number: 4418169
    Abstract: Polyvinyl chloride polymers are made more heat degradation resistant by the incorporation of a diorganotin salt of an unsaturated aliphatic dicarboxylic acid ester and a hindered phenolic antioxidant.
    Type: Grant
    Filed: September 4, 1962
    Date of Patent: November 29, 1983
    Assignee: M & T Chemicals Inc.
    Inventors: Ambrose J. Gibbons, Jr., Robert C. Ringwood, Jr.
  • Organotin stabilizer composition
    Patent number: 4183846
    Abstract: In accordance with certain of its aspects, this invention relates to stabilizing compositions; to stabilized polymers; and to the process for preparing a novel halogen-containing polymer stabilized against the deteriorative effect of heat which comprises adding to a halogen-containing resin a stabilizing amount of: a first stabilizer having the formula RSn(SR').sub.3 wherein R is selected from the group consisting of methyl, butyl and octyl radicals and R' is a residue of a carboxylic acid ester derived from acetic or propionic acid and a monohydric alcohol containing between 8 and 12 carbon atoms or a dodecyl hydrocarbon radical; and a second stabilizer of the formula R".sub.2 Sn.dbd.S wherein R" represents a monovalent hydrocarbon radical selected from the group consisting of methyl and butyl radicals.
    Type: Grant
    Filed: May 10, 1971
    Date of Patent: January 15, 1980
    Assignee: M&T Chemicals Inc.
    Inventors: William A. Larkin, Robert C. Ringwood, Jr.
  • Method for improving the heat stability of polyvinyl chloride
    Patent number: 4010138
    Abstract: The heat stability imparted to plasticized vinyl chloride polymers by di- or triesters of phosphorous acid is significantly increased by the addition of 0.1-1% by weight of specified organotin compounds to the polymer composition. The concentration of organotin compound is between 3 and 45%, based on the combined weight of the phosphorous acid ester and organotin compound.
    Type: Grant
    Filed: December 6, 1974
    Date of Patent: March 1, 1977
    Assignee: M & T Chemicals Inc.
    Inventors: Adam J. Ejk, Robert C. Ringwood, Jr.
  • Stabilized vinyl chloride polymer compositions
    Patent number: 3933741
    Abstract: The heat stability imparted to vinyl polymers by a given concentration of certain sulfur-containing organotin compounds is not adversely affected with respect to either long term stability or delay in appearance of initial discoloration when a portion of the sulfur-containing organotin compound is replaced by certain less effective organotin stabilizers, including tetraorganotin compounds and diorganotin carboxylates.
    Type: Grant
    Filed: September 17, 1974
    Date of Patent: January 20, 1976
    Assignee: M & T Chemicals Inc.
    Inventors: William A. Larkin, Robert C. Ringwood, Jr.