Patents by Inventor Toshihiro Wakamatsu

Toshihiro Wakamatsu 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).

  • In-vehicle key check system having check history memory
    Patent number: 6580181
    Abstract: An in-vehicle key check system has a security ECU, a transmitter and a receiver for communication with a portable electronic key. The ECU communicates with the electronic key each time a key check condition is satisfied, and checks whether the electronic key is an authorized one based on response signals from the electronic key. The check result indicating that the electronic key is the authorized one is stored in a memory. This check result is erased when a predetermined time elapses or when the electronic key is likely to be taken out from the vehicle. When another check condition is satisfied, the ECU refers to the memory and skips the key check operation if the previous check result is stored in the memory.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: June 17, 2003
    Assignee: Denso Corporation
    Inventors: Tatsuya Wakamatsu Nagoya, Toshihiro Wakamatsu
  • In-vehicle key check system having check history memory
    Publication number: 20020030410
    Abstract: An in-vehicle key check system has a security ECU, a transmitter and a receiver for communication with a portable electronic key. The ECU communicates with the electronic key each time a key check condition is satisfied, and checks whether the electronic key is an authorized one based on response signals from the electronic key. The check result indicating that the electronic key is the authorized one is stored in a memory. This check result is erased when a predetermined time elapses or when the electronic key is likely to be taken out from the vehicle. When another check condition is satisfied, the ECU refers to the memory and skips the key check operation if the previous check result is stored in the memory.
    Type: Application
    Filed: August 29, 2001
    Publication date: March 14, 2002
    Inventors: Tatsuya Katou, Toshihiro Wakamatsu