Patents by Inventor David A. Yeary

David A. Yeary 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).

  • Detection of instantaneous speed variations in a tape drive
    Patent number: 4633333
    Abstract: With high density reel-to-reel tape drives, slight perturbations in the tape path can cause instantaneous speed variations in the tape which can alter the recording density of data on the tape over a very short interval. This condition can be detected by measuring changes in recording intervals on a plurality of data tracks. Whenever all of the tracks indicate an unacceptable change in the recording interval an unacceptable speed variation has been encountered.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: December 30, 1986
    Assignee: International Business Machines Corporation
    Inventors: Alfred W. Blanco, Judson A. McDowell, David A. Yeary