Arithmetic circuit for calculating and accumulating absolute values of the difference between two numerical values
CA 2028230 C · Owner: Nec Corporation · Inventors: Kanoh, Toshiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An arithmetic circuit for calculating and accumulating absolute values of a difference between a first and a second numerical value has a predetermined bit length and is represented by 2's complement notation and outputting an accumulation result as an operation result. The circuit comprises first inverting means for inverting the second numerical value to produce an inverted value; first adder means for producing a sum of the first numerical value and the inverted value and outputting the sum as a first addition result; second inverting means for inverting the first addition result to output an inverted addition result. Selecting means select either one of the inverted addition result and …
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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 22, 1990 and granted July 5, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 22, 2012.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.