Patents by Inventor Lester A. Doe

Lester A. Doe 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).

  • Antioxidant synergists for lubricating compositions
    Patent number: 4880551
    Abstract: This invention relates to synergistic antioxident compositions consisting of (a) 1-[di(4-octylphenyl)aminomethyl]tolutriazole and (b) an antioxidant selected from the group consisting of methylenebis(di-n-butyldithiocarbamate), 2,6-di-t-butyl-4-sec-butylphenol, 2,6-di-t-butyl-4-methylphenol and butylated phenol mixture and lubricating compositions containing same.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: November 14, 1989
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventor: Lester A. Doe
  • Rubber compositions containing phenol derivatives of 1,3,4-thiadiazole
    Patent number: 4818778
    Abstract: A process is disclosed for stabilization of natural rubber against oxidative degradation by incorporating therein phenolic derivatives of 3-hydroxymethyl-5-hydroxymethylthio-1,3,4-thiadiazolidine-2-thione and stabilized rubber compositions thereof.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: April 4, 1989
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventor: Lester A. Doe, Jr.
  • Rubber compositions containing polymeric phenol derivatives of 1,3,4-thiadiazole
    Patent number: 4734457
    Abstract: A process is disclosed for stabilization of natural rubber against oxidative degradation by incorporating therein phenolic derivatives of 3-hydroxymethyl-5-hydroxymethylthio-1,3,4-thiadiazolidine-2-thione and stabilized rubber compositions thereof.
    Type: Grant
    Filed: May 7, 1987
    Date of Patent: March 29, 1988
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventor: Lester A. Doe, Jr.
  • Surface coating compositions containing substituted 1,3,4-thiadiazoles
    Patent number: 4711915
    Abstract: Surface coating compositions having improved resistance to attack by fungi and other microorganisms contain a biocidally effective amount of an antimicrobially active compound having the structural formula ##STR1## wherein R.sup.1 and R.sup.2 each represent an alkyl group having 1-8 carbon atoms.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: December 8, 1987
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventor: Lester A. Doe, Jr.
  • Rubber compositions containing amine derivatives of 1,3,4-thiadiazole
    Patent number: 4704426
    Abstract: A process is disclosed for stabilization of natural rubber against oxidative degradation in the presence of copper by incorporating therein dairylamine derivatives of 3-hydroxymethyl-5-hydroxymethylthio-1,3,4-thiadiazolidine-2-thione and stabilized rubber compositiions thereof.
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: November 3, 1987
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventor: Lester A. Doe, Jr.
  • Norbornene derivatives of phenols
    Patent number: 4677149
    Abstract: Novel phenols substituted by at least one 5-norbornen-2-ylmethoxymethyl group and optionally, by methyl or t-butyl groups are used as nondiscoloring antiozonants and antioxidants in chloroprene polymers.
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: June 30, 1987
    Assignee: R. T. Wanderbilt Company, Inc.
    Inventor: Lester A. Doe, Jr.
  • Dicocoamine derivatives of 2,5-dimercapto-1,3,4-thiadiazole
    Patent number: 4617136
    Abstract: This invention relates to novel dicocoamine derivatives of 2-(octyldithio)-5-mercapto-1,3,4-thiadiazole. The compounds are suitable for use as corrosion inhibitors in lubricating compositions.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: October 14, 1986
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventor: Lester A. Doe, Jr.
  • Multifunctional additives for lubricants
    Patent number: 4202782
    Abstract: Condensation product is prepared by condensing diphenylamine and 2-octanone in the presence of acid catalyst. The product is formulated with p,p'-dioctyldiphenylamine antioxidant and incorporated in lubricants for inhibition of degradation due to oxidation and corrosion.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: May 13, 1980
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventors: Lester A. Doe, Jr., Lester A. Brooks
  • Process for preparation of 2-mercaptotoluimidazole and salts thereof
    Patent number: 4172833
    Abstract: Process for the production of 2-mercaptotoluimidazole by reacting stabilized o-toluenediamine with carbon disulfide in a solvent and recovering the formed product by filtration. o-Toluenediamine is stabilized with hydrazine or its salts. Subsequently 2-mercaptotoluimidazole is converted to a metal salt.
    Type: Grant
    Filed: March 20, 1978
    Date of Patent: October 30, 1979
    Assignee: R. T. Vanderbilt Company, Inc.
    Inventors: Thomas G. Whitney, Lester A. Doe, Jr., Harry E. Hill