Patents by Inventor Hidetoshi Yoshioka

Hidetoshi Yoshioka 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).

  • Phenanthridine derivatives and metal complexes thereof used for transparent recording medium or optical recording medium
    Patent number: 5919928
    Abstract: A phenanthridine derivative metal complex of formula 1 having a large absorption in the near-infrared range and a reduced absorption in the visible range, which phenanthridine derivative metal complex is used in a transparent recording medium: ##STR1## where M is a metal atom, and X is a negative ion.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: July 6, 1999
    Assignee: Nippon Paper Industries, Co., Ltd.
    Inventors: Reiji Ohashi, Yukiko Ryu, Tomoaki Nagai, Hidetoshi Yoshioka
  • Acridine derivative metal complexes used for transparent recording medium or optical recording medium
    Patent number: 5892042
    Abstract: An acridine derivative metal complex of formula 2 having a large absorption in the near-infrared range and a reduced absorption in the visible range, which acridine derivative metal complex is used in a transparent recording medium: ##STR1## where M is a metal atom, and X is a negative ion.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: April 6, 1999
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Reiji Ohashi, Yukiko Ryu, Tomoaki Nagai, Hidetoshi Yoshioka
  • Acridine derivatives and metal complexes thereof used for transparent recording medium or optical recording medium
    Patent number: 5792863
    Abstract: An acridine derivative metal complex of formula 1 or formula 2 having a large absorption in the near-infrared range and a reduced absorption in the visible range, which acridine derivative metal complex is used in a transparent recording medium: ##STR1## where M is a metal atom, and X is a negative ion.
    Type: Grant
    Filed: April 15, 1996
    Date of Patent: August 11, 1998
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Reiji Ohashi, Yukiko Ryu, Tomoaki Nagai, Hidetoshi Yoshioka
  • Pharmaceutical composition containing 2-amino-6-chloropurine-9-.beta.-D-2',3'-dideoxyribofuranoxside
    Patent number: 5580860
    Abstract: An anti-AIDS virus agent is disclosed, which is characterized in that it contains the 2',3'-dideoxypurinenucleosides represented by the chemical formula (I): ##STR1## as an effective ingredient.
    Type: Grant
    Filed: December 5, 1989
    Date of Patent: December 3, 1996
    Assignee: Sanyo Kokusaku Pulp Co., Ltd.
    Inventors: Eiji Kojima, Hidetoshi Yoshioka, Kunichika Murakami, Hiroaki Mitsuya, Takuma Shirasaka, Samuel Broder
  • 2',3'-dideoxy purine nucleosides and process for the preparation thereof
    Patent number: 5563049
    Abstract: 2',3'-Dideoxy purine nucleosides represented by following general formulae [I] and/or [II] ##STR1## (wherein X and Y indicate nitrogen atoms or carbon atoms and R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 indicate each independently any of hydrogen atom, hydroxyl group, amino group, alkyl group, halogen atom, alkoxy group and mercapto group) are produced by bioconversion with strains of E. coli, K. pneumoniae and E. herbicola.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: October 8, 1996
    Assignee: Nippon Paper Industries Co., Ltd.
    Inventors: Eiji Kojima, Hidetoshi Yoshioka, Hidenori Fukinbara, Kunichika Murakami
  • 2',3'-dideoxy purine nucleoside
    Patent number: 5053499
    Abstract: 2', 3'-Dideoxy purine nucleosides represented by following general formulae [I] and/or [II] ##STR1## (wherein X and Y indicate nitrogen atoms or carbon atoms and R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 indicate each independently any of hydrogen atom, hydroxyl group, amino group, alkyl group, halogen atom, alkoxy group and mercapto group), process for the preparation thereof and applications thereof to the antiviral agent, antiretroviral agent, therapeutic drug and preventive drug for acquired immunodeficiency syndrome (AIDS), and experimental medicine and experimental reagent to be used in genetic engineering are claimed.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: October 1, 1991
    Assignee: Sanyo-Kokusaku Pulp Co., Ltd.
    Inventors: Eiji Kojima, Hidetoshi Yoshioka, Hidenori Fukinbara, Kunichika Murakami
  • 2',3'-dideoxy-4-thio-uridine derivatives, process for their preparation and antivirus agents using them
    Patent number: 4954485
    Abstract: 2',3'-Dideoxy-4-thio-uridine derivatives represented by a following general formula ##STR1## (wherein R indicates hydrogen or protecting groups such as acetyl group, benzoyl group, trityl groups, etc.), process for their preparation, antivirus agents used them as effective ingredients and therapeutic method and therapeutic drugs for virus diseases are disclosed.
    Type: Grant
    Filed: June 1, 1988
    Date of Patent: September 4, 1990
    Assignee: Sanyo-Kokusaku Pulp Co., Ltd.
    Inventors: Hidetoshi Yoshioka, Eiji Kojima, Shuji Ishida, Hiroyuki Yoshioka, Kunichika Murakami