Patents by Inventor Hideaki Yamanada

Hideaki Yamanada 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).

  • Process for the preparation of 3-phosphoniummethyl-3-cephem compounds
    Patent number: 4705851
    Abstract: The invention relates to a process for the preparation of 3-phosphoniummethyl-3-cephem compounds of the formula: ##STR1## wherein R.sub.3 is aryl, or a salt thereof, which is characterized by reacting one equimolar amount of a 3-hydroxymethyl-3-cephem compound of the formula: ##STR2## or a salt thereof, with two or a little over two equimolar amount of triarylphosphine and one or a little over one equimolar amount of iodine, said prepared compounds being useful as intermediates for manufacturing 3-vinyl-3-cephem compounds possessing potent antimicrobial activities.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: November 10, 1987
    Assignee: Fujisawa Pharmaceutical Co., Ltd.
    Inventors: Takao Takaya, Hisashi Takasugi, Takashi Masugi, Hideaki Yamanada, Kohji Kawabata