Patents by Inventor Marvin J. Thompson

Marvin J. Thompson 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).

  • Cache/disk subsystem with dual aging of cache entries
    Patent number: 4437155
    Abstract: When a processor issues a read or write command to read one or more words from a disk, a cache store is checked to see if a copy of the segment(s) containing the word(s) are present therein. If a copy of the segment is not present in the cache store then it is moved from disk to the cache store and sent to the processor. A segment descriptor table is maintained and the entries in the table are linked by forward and backward age links. When a segment is brought into the cache store from a disk because it contains the word or words specified by a command, its segment descriptor is linked in the age chain as the most recently used. Provision is made for reading into the cache store one or more segments in addition to the segment(s) containing the word(s) specified by a command, on speculation that the additional segment(s) contain words most likely to be accessed soon by the processor.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: March 13, 1984
    Assignee: Sperry Corporation
    Inventors: Daniel D. Sawyer, Marvin J. Thompson