Patents by Inventor Kuniyuki Tokunaga

Kuniyuki Tokunaga 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).

  • Packing material for liquid chromatography and method for the preparation thereof
    Patent number: 4686269
    Abstract: A packing material for liquid chromatography comprising monovinyl aromatic monomer and divinyl or polyvinyl aromatic monomer is disclosed, wherein, in gel permeation chromatography, exclusion limit molecular weight is not less than 1.times.10.sup.3 in terms of standard polystyrene, average particle diameter lies within a rage of 0.5 to 50 .mu.m and the constitution rate of divinyl or polyvinyl aromatic monomer in copolymer particles is not less than 60% by weight, and a method for the preparation thereof is claimed, wherein suspension polymerization is carried out in a mixed aqueous solution containing organic colvent which dissolves whole monomer containing not less than 60% by weight of divinyl or polyvinyl aromatic monomer in whole monomer by amounts of 50 to 300% by weight of the solvent to both monomers and does not dissolve the copolymer of these monomers and radical polymerization initiator.
    Type: Grant
    Filed: December 26, 1985
    Date of Patent: August 11, 1987
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kuniyuki Tokunaga, Tsutomu Hashimoto