Patents by Inventor Isamu Saikawa

Isamu Saikawa 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).

  • Intermediate for cephalosporin type compound
    Patent number: 4237280
    Abstract: The N,N-dimethylacetamide adduct of 7-[D(-)-.alpha.-(4-ethyl-2,3-dioxo-1-piperazinecarboxamido)-.alpha.-(4-hyd roxyphenyl)acetamido]-3-[5-(1-methyl-1,2,3,4-tetrazolyl)thiomethyl]-.DELTA. .sup.3 -cephem-4-carboxylic acid, a process for the production thereof, and a process for producing said acid and a pharmaceutically acceptable salt thereof through said adduct.
    Type: Grant
    Filed: September 25, 1978
    Date of Patent: December 2, 1980
    Assignee: Toyama Chemical Company, Limited
    Inventors: Isamu Saikawa, Shuntaro Takano, Kaishu Momonoi, Isamu Takakura, Chiaki Kutani, Kiyoshi Tanaka, Kenshin Hayashi
  • Novel penicillins and cephalosporins and process for producing same
    Patent number: 4219554
    Abstract: Novel penicillins and non-toxic salts thereof, which contain a mono- or di-oxo- or thioxo-piperazino(thio)carbonylamino group have been prepared. These compounds are valuable antibacterial compounds for use in mammals including man. A process for the preparation of the compounds has also been discovered.
    Type: Grant
    Filed: June 15, 1978
    Date of Patent: August 26, 1980
    Assignee: Toyama Chemical Company, Limited
    Inventors: Isamu Saikawa, Shuntaro Takano, Chosaku Yoshida, Okuta Takashima, Kaishu Momonoi, Seietsu Kuroda, Miwako Komatsu, Takashi Yasuda, Yutaka Kodama
  • Substituted 7.alpha.-methoxy-7.beta.[(2,3-dioxo-1-piperazinyl)carbonylaminophenylace tamido]cephalosporins
    Patent number: 4200744
    Abstract: Novel 7.alpha.-methoxy-cephalosporins and non-toxic salts thereof, which contain a di-oxo-piperazinyl-carbonylamino group in molecule. These compounds are valuable antibacterial compounds for use in mammals including man. This disclosure relates to such compounds and methods for producing the same.
    Type: Grant
    Filed: October 27, 1977
    Date of Patent: April 29, 1980
    Assignee: Toyama Chemical Company, Limited
    Inventors: Isamu Saikawa, Shuntaro Takano, Hiroyuki Imaizumi, Isamu Takakura, Hirokazu Ochiai, Takashi Yasuda, Hideo Taki, Masuru Tai, Yutaka Kodama
  • Antibacterial composition for medical use
    Patent number: 4199566
    Abstract: An antibacterial composition for medical use comprising 6-[-)-.alpha.-(4-ethyl-2,3-dioxo-1-piperazinylcarbonylamino)phenylacetamid o]penicillanic acid or a pharmaceutically acceptable salt thereof and a .beta.-lactamase-inhibiting penicillin or cephalosporin. The composition exhibits synergistic effect which is much greater than the sum of antibacterial effects of each component used alone.
    Type: Grant
    Filed: June 6, 1978
    Date of Patent: April 22, 1980
    Assignee: Toyama Chemical Company, Limited
    Inventors: Isamu Saikawa, Takashi Yasuda, Masaru Tai, Yutaka Takashita, Hiroshi Sakai, Michiko Mae, Masahiro Takahata, Susumu Mitsuhashi
  • 7.alpha.-Methoxy-cephalosporins
    Patent number: 4129730
    Abstract: Novel 7.alpha.-methoxy-cephalosporins and non-toxic salts thereof, which contain a di-oxo-piperazinylcarbonylamino group in molecule. These compounds are valuable antibacterial compounds for use in mammals including man. This disclosure relates to such compounds.
    Type: Grant
    Filed: January 13, 1977
    Date of Patent: December 12, 1978
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Isamu Saikawa, Shuntaro Takano, Hiroyuki Imaizumi, Isamu Takakura, Hirokazu Ochiai, Takashi Yasuda, Hideo Taki, Masaru Tai, Yutaka Kodama
  • Novel penicillins and cephalosporins and process for producing the same
    Patent number: 4112090
    Abstract: Novel penicillins and cephalosporins and non-toxic salts thereof, which contain a mono- or di-oxo- or thioxo-piperazino(thio)carbonylamino group have been prepared. These compounds are valuable antibacterial compounds for use in mammals including man. A process for the preparation of the compounds has also been discovered.
    Type: Grant
    Filed: January 30, 1976
    Date of Patent: September 5, 1978
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Isamu Saikawa, Shuntaro Takano, Chosaku Yoshida, Okuta Takashima, Kaishu Momonoi, Seietsu Kuroda, Miwako Komatsu, Takashi Yasuda, Yutaka Kodama
  • 2,3 Diketo-piperazinocarbonylamino alkanoic acids and derivatives
    Patent number: 4110327
    Abstract: Novel penicillins and cephalosporins and non-toxic salts thereof, which contain a mono- or di-oxo- or thioxo-piperazino(thio)carbonylamino group in molecule. These compounds are valuable antibacterial compounds for use in mammals including man. This disclosure relates to such compounds and a process for the preparation thereof.
    Type: Grant
    Filed: October 15, 1976
    Date of Patent: August 29, 1978
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Isamu Saikawa, Shuntaro Takano, Chosaku Yoshida, Okuta Takashima, Kaishu Momonoi, Seietsu Kuroda, Miwako Komatsu, Takashi Yasuda, Yutaka Kodama
  • Novel penicillins and cephalosporins and process for producing the same
    Patent number: 4087424
    Abstract: Novel penicillins and cephalosporins and non-toxic salts thereof, which contain a mono- or di-oxo- or thioxo-piperazino(thio)carbonylamino group in molecule. These compounds are valuable antibacterial compounds for use in mammals including man. This disclosure relates to such compounds and a process for the preparation thereof.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: May 2, 1978
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Isamu Saikawa, Shuntaro Takano, Chosaku Yoshida, Okuta Takashima, Kaishu Momonoi, Seietsu Kuroda, Miwako Komatsu, Takashi Yasuda, Yutaka Kodama
  • Bis-type penicillins and process for producing the same
    Patent number: 3981865
    Abstract: Novel bis-type penicillins containing a (thio)acylureido group in the molecule, which are valuable antibacterial compounds for use in mammals including a human being.This disclosure relates to such compounds and a process for the preparation thereof.
    Type: Grant
    Filed: June 11, 1975
    Date of Patent: September 21, 1976
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Isamu Saikawa, Shuntaro Takano, Okuta Takashima, Kaishu Momonoi, Seietsu Kuroda, Miwako Komatsu, Takashi Yasuda, Kyoko Kasuya, Yutaka Kodama