Magnetic tape system with command prefetch means
CA 1280510 C · Owner: Ishiguro, Masayuki · Inventors: Ohwa, Noboru; Ishiguro, Masayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic tape system including: a drive mechanism (1) having motors (10a, 10b) for driving a pair of reels on which is wound magnetic tape (16) having a beginning-of-tape mark (BOT) and an end-of-tape mark (EOT) and having a magnetic head (14); a drive control unit (2, 20, 21), for controlling the drive mechanism based on given commands so as to write data on or read data from the magnetic tape, calculating the running distance of the magnetic tape based on the diameters of the magnetic tape and issuing an EWA signal indicating the approach of the end of the magnetic tape before detection of the end-of-tape mark; and a prefetch control unit, having a first memory which stores a plurality …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.