Patents by Inventor Tooru Shirotori

Tooru Shirotori 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).

  • Patent number: 5696950
    Abstract: A flexible clock and reset signal generation and distribution system and method for distributing a relatively low frequency clock signal to various elements of a computer system that require higher frequency clock signals for operation and includes programmable frequency synthesizers containing phase locked loop (PLL) type frequency multipliers, which are located physically adjacent to the computer system elements for receiving the low frequency clock signal and generating the various required higher frequency clock signals. The source of the relatively low frequency clock signal is a real-time clock (RTC) module having a crystal oscillator, a reset signal generator, and a low voltage detector. The RTC module switches off the low frequency clock signal when the main system power supply falls below a prescribed voltage level, such as, a battery voltage, or a voltage reference, or a combination battery voltage and voltage reference.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: December 9, 1997
    Assignee: Seiko Epson Corporation
    Inventors: Kazushige Ichinose, Masayuki Kikushima, Hideo Karasawa, Tooru Shirotori, Mikio Shigemori