Multihead recording and retrieval apparatus and procedure for use with self-timing optical lathe or pre-formatted discs
CA 2281687 A1 · Owner: Smith, Gregory · Inventors: Wiltshire, John H. D.; Smith, Gregory; Dewar, Stephen W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical drive to transfer data between a data carrier (10) and a data communication circuit is disclosed. The drive has a support to rotate said carrier about an axis and a plurality of optical head assemblies are disposed about the axis. Each of the head assemblies are radially adjustable relative to said axis to scan said carrier as it rotates. Each of said head assemblies has a clock recovery circuit associated therewith to obtain a clock signal for data processed by respective ones of the optical head assemblies. A plurality of data streams may be processed and their outputs combined to enhance the data recovery rate. The clock signals are derived from a timing track …
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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 February 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 2019.
- 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.