Frequency detector circuit
CA 1058288 A · Owner: Hewlett-Packard Company · Inventors: Mortensen, Alan C.; Clifford, Douglas M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A frequency detector circuit is provided to detect which of two input signals is higher in frequency and to produce digital output information to indicate the frequency relationship of the two input signals. The frequency relationship between the two input signals is determined without regard to the phase relationship between the two input. signals and is effected by sensing either rising edges or falling edges of each of the input signals and detecting when two such edges of one input signal occur without an intervening edge of the other input signal.
Read the whole patent
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
- Granted July 10, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 10, 1996.
- 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.