Patents by Inventor Tomoyuki Shimada

Tomoyuki Shimada 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).

  • Speaker diaphragm and method of manufacturing same
    Publication number: 20020140136
    Abstract: A speaker diaphragm is formed from a material combining a fiber-type material and a ceramic-type-coating agent including metal alkoxide, metal hydroxide, and a colloidal or fine-particulate inorganic substance. The combining process for the ceramic-type-coating agent is performed before or after the fiber-type material is formed into a shape of the diaphragm.
    Type: Application
    Filed: March 29, 2002
    Publication date: October 3, 2002
    Applicant: PIONEER CORPORATION
    Inventors: Toshihiro Ishigaki, Hideo Sekikawa, Koji Maekawa, Tomoyuki Shimada
  • Speaker voice coil bobbin and method of manufacturing same
    Publication number: 20020141609
    Abstract: A voice coil bobbin 1 is formed from a material combining a fiber-type material and a ceramic-type-coating agent including metal alkoxide, metal hydroxide, and a colloidal or fine-particulate inorganic substance. The combining process for the ceramic-type-coating agent is performed before or after the fiber-type material is formed into a shape of the voice coil bobbin 1.
    Type: Application
    Filed: March 29, 2002
    Publication date: October 3, 2002
    Applicant: PIONEER CORPORATION
    Inventors: Toshihiro Ishigaki, Tomoyuki Shimada
  • Bisazo compound and electrophotographic photoconductor using the same
    Publication number: 20020127487
    Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon which contains at least one bisazo compound of formula (I): 1
    Type: Application
    Filed: September 4, 2001
    Publication date: September 12, 2002
    Applicant: Ricoh Company, Ltd.
    Inventor: Tomoyuki Shimada
  • Bisazo compound and electrophotographic photoconductor using the same
    Patent number: 6448384
    Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon which contains at least one bisazo compound of formula (I): wherein Cp1 and Cp2 are each a coupler radical which may be the same or different. Further, these are disclosed a bisazo compound of formula (II), and raw materials thereof, that is, 1,4-bis[4-(4-nitrophenyl)-1,3-butadienyl]benzene of formula (V), 1,4-bis[4-(4-aminophenyl)-1,3-butadienyl]benzene of formula (VI) and a bis(diazonium salt) compound of formula (III).
    Type: Grant
    Filed: September 4, 2001
    Date of Patent: September 10, 2002
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomoyuki Shimada
  • Electrophotographic photoreceptor, and process cartridge and electrophotographic image forming apparatus using the electrophotographic photoreceptor
    Publication number: 20020045117
    Abstract: An electrophotographic photoreceptor for an electrophotographic image forming apparatus which has a laser diode or a light emitting diode emitting a light having a wavelength of 350 to 500 nm as an image writing light source, wherein the photoreceptor includes a photosensitive layer including a deactivating agent.
    Type: Application
    Filed: July 5, 2001
    Publication date: April 18, 2002
    Inventors: Tomoyuki Shimada, Kazukiyo Nagai, Chiaki Tanaka, Michihiko Namba, Shinichi Kawamura
  • Electrophotographic photoconductor, image forming apparatus, and process cartridge using the photoconductor
    Publication number: 20020028400
    Abstract: An electrophotographic photoconductor has an electroconductive support, and a charge generation layer and a charge transport layer successively formed on the electroconductive support, the charge transport layer allowing any monochromatic light with a wavelength in a wavelength region of 390 to 460 nm to pass through and exhibiting a fluorescence generation coefficiency of 0.8 or less when irradiated with the monochromatic light. An electrophotographic image forming apparatus and a process cartridge employ the above-mentioned photoconductor.
    Type: Application
    Filed: March 27, 2001
    Publication date: March 7, 2002
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Kazukiyo Nagai, Chiaki Tanaka, Michihiko Namba, Shinichi Kawamura
  • Electrophotographic photoconductor, image forming method and apparatus, and process cartridge using the photoconductor, and long-chain alkyl group containing bisphenol compound and polymer made therefrom
    Publication number: 20020025483
    Abstract: An electrophotographic photoconductor has an electroconductive support and a photoconductive layer which is formed thereon and contains at least one resin of a polyurethane resin, a polyester resin, or a polycarbonate resin, each resin having at least a structural unit of formula (1): 1
    Type: Application
    Filed: March 23, 2001
    Publication date: February 28, 2002
    Applicant: Ricoh Company, Ltd.
    Inventors: Shinichi Kawamura, Kazukiyo Nagai, Tomoyuki Shimada, Chiaki Tanaka, Michihiko Namba
  • Mixture of titanyltetraazaporphyrin compounds and electrophotographic photoconductor using the same
    Publication number: 20020007056
    Abstract: A mixture is made of a plurality of different titanyltetraazaporphyrin compounds, each of which is represented by formula (1): 1
    Type: Application
    Filed: July 16, 2001
    Publication date: January 17, 2002
    Applicant: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Masayuki Shoshi, Kaoru Tadokoro, Chiaki Tanaka, Michihiko Namba
  • Bisazo compound and electrophotographic photoconductor using the same
    Patent number: 6333439
    Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon which contains at least one bisazo compound of formula (I): wherein Cp1 and Cp2 are each a coupler radical which may be the same or different. Further, these are disclosed a bisazo compound of formula (II), and raw materials thereof, that is, 1,4-bis[4-(4-nitrophenyl)-1,3-butadienyl]benzene of formula (V), 1,4-bis[4-(4-aminophenyl)-1,3-butadienyl]benzene of formula (VI) and a bis(diazonium salt) compound of formula (III).
    Type: Grant
    Filed: July 3, 2000
    Date of Patent: December 25, 2001
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomoyuki Shimada
  • Electrophotographic photoconductor and aromatic polycarbonate resin for use therein
    Patent number: 6316577
    Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), two structural units of formulae (I) and (II), or a repeat unit of formula (III): wherein Ar1 to Ar7, Y, X, and n are as specified in the specification.
    Type: Grant
    Filed: January 10, 2000
    Date of Patent: November 13, 2001
    Assignee: Hodogaya Chemical Co., Ltd.
    Inventors: Tomoyuki Shimada, Masaomi Sasaki, Masafumi Ohta, Akihiro Imai, Mitsutoshi Anzai, Tamotsu Aruga, Kazukiyo Nagai, Katsuhiro Morooka
  • Mixture of titanyltetraazaporphyrin compounds and electrophotographic photoconductor using the same
    Patent number: 6313288
    Abstract: A mixture is made of a plurality of different titanyltetraazaporphyrin compounds, each of which is represented by formula (1): wherein A, B, C and D are each independently an unsubstituted or substituted benzene ring or pyridine ring, a substituent thereof being selected from the group consisting of nitro group, cyano group, a halogen atom, an alkyl group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, and an aryl group. The above-mentioned mixture is contained in a photoconductive layer of an electrophotographic photoconductor as a photoconductive material.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: November 6, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Masayuki Shoshi, Kaoru Tadokoro, Chiaki Tanaka, Michihiko Namba
  • Electrophotographic photoconductor, azo compounds for use in the same, and intermediates for producing the azo compounds
    Patent number: 6271356
    Abstract: An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon which contains a compound having a charge generating moiety and a charge transporting moiety in the molecule thereof. As such a compound for use in the electrophotographic photoconductor, various compounds having a charge generating moiety derived from an azo compound and a charge transporting moiety derived from a triarylamine compound are proposed. Bisazo and trisazo compounds serving as such compounds are also proposed, together with intermediates for producing the bisazo and trisazo compounds.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: August 7, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Masaomi Sasaki, Chiaki Tanaka
  • Electrophotographic photoconductor and aromatic polycarbonate resin for use therein
    Patent number: 6191249
    Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a repeat unit of formula (I), or two repeat units of formulae (II) and (III): wherein Ar1 to Ar3, X, n, k and j are as specified in the specification.
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: February 20, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Chiaki Tanaka, Nozomu Tamoto, Masaomi Sasaki, Kazukiyo Nagai, Tomoyuki Shimada, Chihaya Adachi, Akira Katayama, Mitsutoshi Anzai, Katsuhiro Morooka
  • Electrophotographic photoconductor, azo compounds for use in the same, and intermediates for producing the azo compounds
    Patent number: 6184362
    Abstract: An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon which contains a compound having a charge generating moiety and a charge transporting moiety in the molecule thereof. As such a compound for use in the electrophotographic photoconductor, various compounds having a charge generating moiety derived from an azo compound and a charge transporting moiety derived from a triarylamine compound are proposed. Bisazo and trisazo compounds serving as such compounds are also proposed, together with intermediates for producing the bisazo and trisazo compounds.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: February 6, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Masaomi Sasaki, Chiaki Tanaka
  • Bisazo compound and electrophotographic photoconductor using the same
    Patent number: 6132914
    Abstract: An electrophotographic photoconductor has an electroconductive support, and a photoconductive layer formed thereon which contains at least one bisazo compound of formula (I): ##STR1## wherein Cp.sup.1 and Cp.sup.2 are each a coupler radical which may be the same or different. Further, these are disclosed a bisazo compound of formula (II), and raw materials thereof, that is, 1,4-bis[4-(4-nitrophenyl)-1,3-butadienyl]benzene of formula (V), 1,4-bis[4-(4-aminophenyl)-1,3-butadienyl]benzene of formula (VI) and a bis(diazonium salt) compound of formula (III).
    Type: Grant
    Filed: April 7, 1999
    Date of Patent: October 17, 2000
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomoyuki Shimada
  • Electrophotographic photoconductor, AZO compounds for use in the same, and intermediates for producing the AZO compounds
    Patent number: 6103435
    Abstract: An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon which contains a compound having a charge generating moiety and a charge transporting moiety in the molecule thereof. As such a compound for use in the electrophotographic photoconductor, various compounds having a charge generating moiety derived from an azo compound and a charge transporting moiety derived from a triarylamine compound are proposed. Bisazo and trisazo compounds serving as such compounds are also proposed, together with intermediates for producing the bisazo and trisazo compounds.
    Type: Grant
    Filed: May 17, 1999
    Date of Patent: August 15, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Masaomi Sasaki, Chiaki Tanaka
  • Electrophotographic photoconductor and polycarbonate resin for use therein
    Patent number: 6093784
    Abstract: An electrophotographic photoconductor is composed of an electroconductive support and a photoconductive layer formed thereon, which photoconductive layer includes a polycarbonate resin. Aromatic polycarbonate resins not only for the electrophotographic photoconductor, but also for the materials for liquid display panels, optical cards, optical discs, varieties of films having high transparency and heat resistance, deposited plastic reflecting mirrors, and lenses are disclosed.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: July 25, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Tamura, Tomoyuki Shimada, Tsutomu Nakajima, Masaomi Sasaki, Toshimasa Tokuda
  • Electrophotographic photoconductor and aromatic polycarbonate resin for use therein
    Patent number: 6069224
    Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a repeat unit of formula (I), or two repeat units of formulae (II) and (III): ##STR1## wherein Ar.sup.1 to Ar.sup.6, X, n, k and j are as specified in the specification.
    Type: Grant
    Filed: January 21, 1998
    Date of Patent: May 30, 2000
    Assignees: Ricoh Company, Ltd., Hodogaya Chemical Co., Ltd.
    Inventors: Chihaya Adachi, Masaomi Sasaki, Kazukiyo Nagai, Tomoyuki Shimada, Chiaki Tanaka, Nozomu Tamoto, Akira Katayama, Mitsutoshi Anzai, Akihiro Imai, Katsuhiro Morooka
  • Stilbene compound and process for producing same
    Patent number: 6066757
    Abstract: A stilbene compound is disclosed which has the following general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each stand for hydrogen, an alkyl group or an acyl group and Ar.sup.1 and Ar.sup.2 each stand for a monovalent homocyclic aromatic group. The stilbene compound may be incorporated into a photoconducting layer of an electrophotographic photoconductor as a charge transporting material. A process for the production of the stilbene compound is also disclosed.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: May 23, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Chiaki Tanaka, Masaomi Sasaki, Tomoyuki Shimada
  • Electrophotographic photoconductor and aromatic polycarbonate resin for use therein
    Patent number: 6027846
    Abstract: An electrophotographic photoconductor includes an electroconductive support, and a photoconductive layer formed thereon containing as an effective component an aromatic polycarbonate resin having a structural unit of formula (I), two structural units of formulae (I) and (II), or a repeat unit of formula (III): ##STR1## wherein Ar.sup.1 to Ar.sup.7, Y, X, and n are as specified in the specification.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: February 22, 2000
    Assignees: Ricoh Company, Ltd., Hodogaya Chemical Co., Ltd.
    Inventors: Tomoyuki Shimada, Masaomi Sasaki, Masafumi Ohta, Akihiro Imai, Mitsutoshi Anzai, Tamotsu Aruga, Kazukiyo Nagai, Katsuhiro Morooka