Patents by Inventor Asao Murai

Asao Murai 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).

  • Method of quantitative assay for vitamin B.sub.12 and reagent for assaying vitamin B.sub.12
    Patent number: 4918005
    Abstract: The present invention is directed to a method of quantitative assay for a vitamin B.sub.12 -containing substance which comprises culturing marine methanol-utilizing bacteria having B.sub.12 auxotrophy in a medium for quantitative assay of the bacteria containing pyrroloquinoline-quinone and a polyoxyethylene sorbitan fatty acid ester and, quantitatively determining vitamin B.sub.12 in the vitamin B.sub.12 -containing substance as a function of the degree of growth thereof and, to a reagent for the B.sub.12 -containing substance comprising a kit for combination of an ampule or vial having sealed therein a dry viable bacteria composition of a marine methanol-utilizing bacteria for inoculation and an ampule or vial having sealed therein a medium for the bacteria containing pyrroloquinoline-quinone and a polyoxyethylene sorbitan fatty acid ester, or in addition thereto, further an ampule or vial having sealed therein a standard dilution of vitamin B.sub.12 having a serial concentration.
    Type: Grant
    Filed: July 17, 1987
    Date of Patent: April 17, 1990
    Assignee: Sanraku Incorporated
    Inventors: Asao Murai, Masao Yamamoto
  • Streptothricin-group compounds
    Patent number: 4560748
    Abstract: A streptothricin-group compound having the formula: ##STR1## in which R represents ##STR2## is disclosed along with methods for producing this compound and a microorganism useful in its production.
    Type: Grant
    Filed: June 3, 1983
    Date of Patent: December 24, 1985
    Assignee: Ajinomoto Company Incorporated
    Inventors: Shigezo Udaka, Shigeyoshi Miyashiro, Kazuo Hirayama, Toshihiko Ando, Asao Murai, Tsuyoshi Shiio, Takao Kida, Hiroshiro Shibai
  • Ring peptide antibiotics, Permetin A and a process for producing the same
    Patent number: 4294754
    Abstract: A purified ring peptide antibiotic of the following empirical formula:N.alpha.-(3-hydroxy-4-methyl-1-oxohexyl)-L-.alpha.,.gamma.-diaminobutyryl-L -isoleucyl-L-.alpha.,.gamma.-diaminobutyryl-D-phenylalanyl-L-leucyl-L-.alph a.,.gamma.-diaminobutyryl-D-valyl-L-leucyl-L-serine (9-1)-lactoneand which has the following structural formula: ##STR1## and wherein Dab represents 2,4-diamino butyric acid.
    Type: Grant
    Filed: April 4, 1979
    Date of Patent: October 13, 1981
    Assignee: Ajinomoto Company, Incorporated
    Inventors: Yoshiyuki Takahara, Yoshiteru Hirose, Yoko Takeuchi, Asao Murai, Masatsune Kainosho, Sawao Murao