Patents by Inventor Sigeru Tsuboi

Sigeru Tsuboi 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).

  • Patent number: 6025310
    Abstract: The invention provides novel organic compounds, and more particularly those having excellent lubricity, compatible with lubricating organic compounds having a benzene ring and a phosphazine ring and retaining stability free of hydrolysis for a prolonged period of time. The organic compounds are represented by the formula R.sub.1 --R.sub.0 --R.sub.1 or R.sub.0 --R.sub.1. R.sub.0 is a chain saturated organic group containing a chain of carbon atoms or a chain of carbon atom C and oxygen atom O, and filled with fluorine atoms F or trifluoromethyl groups CF.sub.3 except at one end or both ends of the chain. R.sub.1 is --CH.sub.2 --O--(CH.sub.2).sub.p --{CH(CH.sub.3)}.sub.k --{C(CH.sub.3).sub.2 }.sub.t --R.sub.2 wherein p, k and t are each an integer of 0 or not smaller than 1, and R.sub.2 is phenyl or a functional group corresponding to phenyl in which at least one of the hydrogen atoms is substituted with a compound of at least two elements selected from the group consisting of C, H, O and F or with F, Br or Cl.
    Type: Grant
    Filed: March 23, 1998
    Date of Patent: February 15, 2000
    Assignee: Kubota Corporation
    Inventors: Ikuzo Nishiguchi, Hiroki Hara, Sigeru Tsuboi, Seiki Sugi, Kazuhiro Higuchi