Apparatus and method for security of electric and electronic devices
CA 1289222 C · Owner: Cairns, John P. · Inventors: Cairns, John P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method having elements and steps selected and arranged to require a timed coded input for, authenticating a code of characters in a set sequence for authorizing user access . and having means for emitting a signal or alarm, wherein the system is initialized so as to require matching of representative signals at inhibiting control circuits having an on-state and an off-state so that characters entered sequentially in timed cycles are authenticated as a correct member of a code set in a correct time cycle or disqualified as an unauthentic character. An authentic character is a certain designated character entered in the selected time cycle.
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 September 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2008.
- 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.