Patents by Inventor Hershow Chang

Hershow Chang 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).

  • Input device interface with power connect state and serial data channel enabling power to the device from time to time
    Patent number: 5590339
    Abstract: An interface for connecting a local input device to a host, such as a telephone message receiving unit. The interface transfers data serially from the local input device to the telephone message receiving unit for print out or facsimile transmission thereby. Control of the interface is governed by a state machine having several states.
    Type: Grant
    Filed: August 23, 1993
    Date of Patent: December 31, 1996
    Assignee: Macronix International Co., Ltd.
    Inventor: Hershow Chang
  • Laser printer controller flexible frame buffer architecture which allows hardware assisted memory erase
    Patent number: 5276781
    Abstract: The present invention relates to a frame buffer used by a laser printer controller to send video signals to a laser printer engine. The frame buffer allows software to have sufficient control over the dimension of the buffer and to have sufficient time to process data by allowing hardware assisted memory erase.
    Type: Grant
    Filed: December 30, 1992
    Date of Patent: January 4, 1994
    Assignees: Ricoh Company, Ltd., Ricoh Corporation
    Inventors: Hershow Chang, Seong Kim, Tetsuro Motoyama
  • Flexible frame buffer architecture having adjustable sizes for direct memory access
    Patent number: 5206932
    Abstract: The present invention relates to a frame buffer used by a laser printer controller to send video signals to a laser printer engine. The frame buffer allows software to have sufficient control of the dimension of the buffer and to have sufficient time to process data by allowing software to change X and Y dimensions of the buffer. In addition, software controls the loading of the frame buffer start address.
    Type: Grant
    Filed: October 22, 1991
    Date of Patent: April 27, 1993
    Assignees: Ricoh Corporation, Ricoh Company, Ltd.
    Inventors: Hershow Chang, Seong Kim, Tetsuro Motoyama
  • Method to connect wide size scanner to laser printer engine for copying with size reduction
    Patent number: 5058038
    Abstract: A method to connect a wide sized document scanner to a laser printer engine for copying with size reduction enables the output to be printed on plain paper through a laser printer and digital copier with different paper sizes. The method utilizes an output buffer such that the original document needs to be scanned only once even though multiple copies are requested. The method adjusts input resolution to output device characteristics by manipulating the pulse width of the video signal and matching the number of output lines.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: October 15, 1991
    Assignee: Ricoh Corporation
    Inventors: Tetsuro Motoyama, Hershow Chang
  • Laser printer controller flexible frame buffer achitecture which allows software to initiate the loading of a frame buffer start address
    Patent number: 4984182
    Abstract: The present invention relates to a frame buffer used by a laser printer controller to send video signals to a laser printer engine. The frame buffer allows software to have sufficient control of the dimension of the buffer and to have sufficient time to process data by allowing software to change X and Y dimensions of the buffer. In addition, software controls the loading of the frame buffer start address.
    Type: Grant
    Filed: June 25, 1990
    Date of Patent: January 8, 1991
    Assignees: Ricoh Company, Ltd., Ricoh Corporation
    Inventors: Hershow Chang, Seong Kim, Tetsuro Motoyama
  • Laser printer controller flexible frame buffer architecture which allows software to change X and Y dimensions of the buffer
    Patent number: 4977519
    Abstract: The present invention relates to a frame buffer used by a laser printer controller to send video signals to a laser printer engine. The frame buffer allows software to have sufficient control over the dimension of the buffer and to have sufficient time to process data by allowing software to change X and Y dimensions of the buffer.
    Type: Grant
    Filed: July 12, 1989
    Date of Patent: December 11, 1990
    Assignees: Ricoh Company, Ltd., Ricoh Corporation
    Inventors: Hershow Chang, Seong Kim, Tetsuro Motoyama
  • Laser printer controller flexible frame buffer architecture which allows offsetting different input/output data widths
    Patent number: 4965748
    Abstract: The present invention relates to a frame buffer used by a laser printer controller to send video signals to a laser printer engine. The frame buffer allows software to have sufficient control over the dimension of the buffer and to have sufficient time to process data by setting different input/output data widths.
    Type: Grant
    Filed: July 12, 1989
    Date of Patent: October 23, 1990
    Assignees: Ricoh Company, Ltd., Ricoh Corporation
    Inventors: Hershow Chang, Seong Kim, Tetsuro Motoyama