Patents by Inventor Charles S. Kline

Charles S. Kline 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).

  • Dual operating system computer
    Patent number: 4747040
    Abstract: The UNIX.RTM. and MS-DOS.RTM. operating systems are supported in a multi-tasking computer. At the heart of the computer is a microprocessor having protected and non-protected modes. The computer includes special-purpose hardware which prevents the MS-DOS system and its applications, which execute in the non-protected mode, from interfering with the UNIX system and its applications, which execute in the protected mode. In particular, this hardware monitors addresses generated by the computer and, by selectively inhibiting the associated control pulses, prevents the MS-DOS system from, for example, writing in UNIX-system-allocated memory, or accessing I/O devices that the UNIX system is currently using. In addition, a context switching feature is provided whereby the user can select, via a keyboard operation, to have displayed on the computer video monitor at any given time the image generated from the current UNIX system screen data or the image generated from the current MS-DOS system screen data.
    Type: Grant
    Filed: October 9, 1985
    Date of Patent: May 24, 1988
    Assignees: American Telephone & Telegraph Company, AT&T Information Systems, Inc., Locus Computing Corporation
    Inventors: David R. Blanset, David A. Butterfield, Kenneth M. Keverian, Charles S. Kline, Gerald J. Popek
  • Display context switching arrangement
    Patent number: 4744048
    Abstract: The UNIX.RTM. and $MS-DOS sup R $ operating systems are supported in a multi-tasking computer. At the heart of the computer is a microprocessor having protected and non-protected modes. The computer includes special-purpose hardware which prevents the MS-DOS system and its applications, which execute in the non-protected mode, from interfering with the UNIX system and its applications, which execute in the protected mode. In particular, this hardware monitors addresses generated by the computer and, by selectively inhibiting the associated control pulses, prevents the MS-DOS system from, for example, writing in UNIX-system-allocated memory, or accessing I/O devices that the UNIX system is currently using. In addition, a context switching feature is provided whereby the user can select, via a keyboard operation, to have displayed on the computer video monitor at any given time the image generated from the current UNIX system screen data or the image generated from the current MS-DOS system screen data.
    Type: Grant
    Filed: October 9, 1985
    Date of Patent: May 10, 1988
    Assignees: American Telephone and Telegraph Company, AT&T Information Systems Inc., Locus Computing Corporation
    Inventors: David R. Blanset, David A. Butterfield, Kenneth M. Keverian, Charles S. Kline, Gerald J. Popek