Patents by Inventor Takekazu Iijima

Takekazu Iijima 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 unit for automotive vehicles
    Patent number: 4365113
    Abstract: A speaker unit for an automotive vehicle including a woofer speaker flush mounted with the rear parcel shelf of the vehicle with a tweeter or medium- and high-range speaker unit mounted to the rear of the woofer speaker. The tweeter speaker is directed toward the passenger compartment of the vehicle. A woofer frame is detachably coupled around the outer edge of the woofer speaker. The woofer frame supports a grill which extends as well over the tweeter speaker. A sound diffuser is positioned over the open surface of the tweeter speaker.
    Type: Grant
    Filed: September 12, 1980
    Date of Patent: December 21, 1982
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroshi Soma, Makoto Iyobe, Takekazu Iijima, Yutaka Moriyama
  • Loudspeaker with grille
    Patent number: D254130
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: February 5, 1980
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Loudspeaker
    Patent number: D254434
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: March 11, 1980
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Loudspeaker
    Patent number: D258359
    Type: Grant
    Filed: May 4, 1978
    Date of Patent: February 24, 1981
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Loudspeaker
    Patent number: D265477
    Type: Grant
    Filed: July 1, 1980
    Date of Patent: July 20, 1982
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Loudspeaker
    Patent number: D265556
    Type: Grant
    Filed: September 5, 1980
    Date of Patent: July 27, 1982
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Loudspeaker
    Patent number: D265732
    Type: Grant
    Filed: September 5, 1980
    Date of Patent: August 10, 1982
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Loudspeaker
    Patent number: D266324
    Type: Grant
    Filed: April 10, 1980
    Date of Patent: September 28, 1982
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Amplifier
    Patent number: D266510
    Type: Grant
    Filed: May 24, 1979
    Date of Patent: October 12, 1982
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima
  • Loudspeaker
    Patent number: D268673
    Type: Grant
    Filed: December 2, 1980
    Date of Patent: April 19, 1983
    Assignee: Pioneer Kabushiki Kaisha
    Inventor: Takekazu Iijima