Method for doubling levels of coding
CA 2335849 A1 · Owner: Dirr, Josef · Inventors: Dirr, Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a multi-step method for doubling levels of coding whereby uninterrupted periodic sequences are provided as code elements e.g. , an alternating current with an identical frequency and phase relation and the code elements are marked in relation to each other by variations in amplitude. The inventive method enables amplitude variation to begin with an alternating positive or negative half-period so that the following element can be marked according to code, thereby enabling two levels to be marked with one code element. Instead of three levels, six levels are obtained. When expressed in numbers, combinations of 9,27,81,243 are obtained for 3 levels and 2,3,4,5 …
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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 October 29, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2020.
- 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.