Patents by Inventor Khirud B. Chakraborty

Khirud B. Chakraborty 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).

  • Photodegradable compositions
    Patent number: 5274019
    Abstract: A polymer composition comprises a minor amount of a pro-degradant selected from essentially carboxycylic .beta.-diketones and metal complexes thereof, e.g. 2,2'-methylene(1,3-cyclohexanedione) or its Mn(II) or Zn complex. A film of the composition may be used for the protection of seeds or seedlings at an agricultural or horticultural locus.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: December 28, 1993
    Assignee: Robinson Brothers Limited
    Inventors: William R. Poyner, Khirud B. Chakraborty
  • Stabilizing polymers and polymer films
    Patent number: 4731949
    Abstract: A composition which comprises a polymer and a nickel dialkyldithiocarbamate of the formula (R.sup.1 R.sup.2 NCSS).sub.2 Ni, wherein R.sup.1 and R.sup.2 are the same or different branched-chain C.sub.5-18 alkyl groups. Such a composition, which preferably additionally comprises a zinc dialkyldithiocarbamate, can be used, e.g. in film or sheet form, to protect flora at an agricultural or horticultural locus.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: March 22, 1988
    Assignee: Robinson Brothers Limited
    Inventors: William R. Poyner, Khirud B. Chakraborty
  • Stabilized thermoplastic polymer compositions comprising a C-nitroso compound
    Patent number: 4672088
    Abstract: Thermoplastic polymers are stabilized by mixing therewith, under polymer processing conditions such that nitroxyl radicals are formed, a nitrogen stabilizers therefor, which is (a) a C-nitroso-containing compound (b) an N-nitroso-containing compound, or (c) a nitrone-containing compound.
    Type: Grant
    Filed: May 24, 1985
    Date of Patent: June 9, 1987
    Inventors: Gerald Scott, Khirud B. Chakraborty