Patents by Inventor Shuuichi Haga

Shuuichi Haga 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).

  • Magnetic recording medium lubricant consisting of an amine salt of carboxylic acid, an amine salt of perfluoroalkyl carboxylic acid or an fluoro amine salt of perfluoro carboxylic acid
    Patent number: 5091269
    Abstract: A magnetic recording medium containing an amine salt of carboxylic acid as the lubricant is disclosed. The amine salt of carboxylic acid means a usual amine salt of carboxylic acid, synthesized from carboxylic acid and an organic amine, an amine salt of perfluoroalkyl carboxylic acid, synthesized from perfluoroalkyl carboxylic acid and an organic amine, and a fluoroamine salt of perfluoroalkyl carboxylic acid, synthesized from a perfluoroalkyl carboxylic acid and a fluorine substituted organic amine. The amine salt of carboxylic acid may be contained in the magnetic layer of the magnetic recording medium or top coated on the magnetic layer. Such amine salt of carboxylic acid exhibits superior solubility in general-purpose solvents and superior lubricating properties to diminish the coefficient of friction. Such lubricating properties are not impaired under hostile conditions, such as low temperature.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: February 25, 1992
    Assignee: Sony Corporation
    Inventors: Hirofumi Kondo, Shuuichi Haga, Takaaki Matsuda