Patents by Inventor William B. Hardy

William B. Hardy 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).

  • Novel light stabilizers for polymers
    Patent number: 4331586
    Abstract: Oligomers of the formula ##STR1## which contain at least one piperidinyl moiety in the repeating unit are useful as light stabilizers for polymers.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: May 25, 1982
    Assignee: American Cyanamid Company
    Inventor: William B. Hardy
  • Isopropylidenedicyclohexylene esters and their use as light stabilizers
    Patent number: 4293467
    Abstract: Isopropylidenedicyclohexylene esters of 2,2,6,6-tetramethylpiperidine-4-carboxylic acid are disclosed as well as their use as light stabilizers for thermoplastic polymers such as polypropylene.
    Type: Grant
    Filed: January 16, 1980
    Date of Patent: October 6, 1981
    Assignee: American Cyanamid Company
    Inventors: William B. Hardy, Frank F. Loffelman
  • Process for the preparation of 2-aryl-2H-benzotriazoles
    Patent number: 4224451
    Abstract: A two stage reductive ring closure of o-nitrophenylazophenols produces 2-aryl-2H-benzotriazoles by (a) reacting an organic solvent solution of azophenol with an excess of an aqueous solution of a sulfhydrate or sulfide to form an N-oxide and (b) reducing the N-oxide with an alkali metal hydroxide plus zinc or tin.
    Type: Grant
    Filed: December 20, 1978
    Date of Patent: September 23, 1980
    Assignee: American Cyanamid Company
    Inventors: Rex D. Roberts, William B. Hardy
  • Polymers stabilized with organo-phosphorus compounds
    Patent number: 4192796
    Abstract: Tertiary phosphine oxide compounds are disclosed as well as their use as stabilizers for polymers.
    Type: Grant
    Filed: March 26, 1979
    Date of Patent: March 11, 1980
    Assignee: American Cyanamid Company
    Inventors: William L. Mosby, William B. Hardy
  • Pentaerythrityl diphosphonate-ammonium polyphosphate combinations as flame retardants for olefin polymers
    Patent number: 4174343
    Abstract: Self-extinguishing, non-dripping polyolefin polymer compositions are prepared from a mixture of certain pentaerythrityl diphosphonates and ammonium phosphate. Dicyanopentaerythrityl diphosphonate, a new compound, is useful herein without the polyphosphate.
    Type: Grant
    Filed: May 5, 1978
    Date of Patent: November 13, 1979
    Assignee: American Cyanamid Company
    Inventors: William B. Hardy, Tae B. Min, Joseph A. Hoffman
  • Light and heat stabilizers for polyolefins
    Patent number: RE30385
    Abstract: Compounds of the formula: ##STR1## wherein R is hydrogen or alkyl (C.sub.1 -C.sub.8), R' is hydrogen, hydroxyl or lower alkoxy (C.sub.1 -C.sub.8); R" is alkyl (C.sub.1 -C.sub.20), alkylene (C.sub.2 -C.sub.12), cycloalkyl, wherein the alicyclic ring contains 5- or 6-carbon atoms, cycloalkylene, wherein the alicyclic ring may contain lower alkyl substituents, alkenyl (C.sub.3 -C.sub.20), arylene or aralkylene; n is an integer from 1 to 4, are useful for stabilizing polyolefin polymer against photo and thermal degradation.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: August 26, 1980
    Assignee: American Cyanamid Company
    Inventors: Ray L. Hillard, William B. Hardy