Digital arrangement for error checking in binary adder including block carry look-ahead units
CA 2018271 C · Owner: Nec Corporation · Inventors: Tanaka, Masayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A binary adder is comprised of a plurality of block carry look-ahead units. Each of the units includes a block carry-in generator, an adding section a block, carry-out generator and a carry coincidence checker. The block carry-in generator is arranged to receive a plurality of carry generate variables and a plurality of carry propagate variables from the other units generating a carry-in using carry look-ahead scheme. The adding section is coupled to receive the carry-in from said block carry-in generator and further receives two operand data to be added and generates a resultant sum of the two operand data. The block carry-out generator receives the two operand data and also receives the …
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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 June 5, 1990 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 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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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.