Patents by Inventor Siro Takeuchi

Siro Takeuchi 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).

  • Indicator for detecting residual ethylene oxide
    Patent number: 4678640
    Abstract: An indicator for detecting residual ethylene oxide comprising a substrate impregnated with a solution of 4-(4-nitrobenzyl)pyridine and an envelope of the substrate which is at least partially transparent and has low permeability to gaseous ethylene oxide is provided, the envelope being preferably made of a transparent plastic film. With the indicator, an amount of ethylene oxide remaining in various medical instruments, etc. may be estimated by the naked eye since the color of the indicator changes step by step in the course of the release of residual ethylene oxide.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: July 7, 1987
    Assignee: Ekika Carbon Dioxide Co., Ltd.
    Inventors: Masanori Hamano, Siro Takeuchi, Ichiro Inoue