Method and apparatus for achieving high speed data transfer from a parallel port
CA 2176830 A1 · Owner: Spurrier, Randall J. · Inventors: Blair, Stuart R.; Mierau, Peter; Spurrier, Randall J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention removes restrictions on the maximum data transfer rate provided by the Centronics and PC-compatible parallel interface (i.e. standard parallel interface). Further the present invention retains complete compatibility with the standard parallel port and peripheral device cable. With the present invention, a computer (i.e. host) is able to send data through a standard parallel port at a high rate by eliminating the Busy handshaking signal. Further, one to three Input/Output (I/O) instructions can be eliminated for each byte of data transfer.
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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
- Filed November 15, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 2016.
- 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.