Electronic security system
CA 2082649 C · Owner: Hyatt, Richard G. Jr. · Inventors: Hyatt, Richard G. Jr.; Hall, Charles E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electronic security system includes an electronic lock mechanism (201) and an electronic key (101 and 104) each, of which is provided with a microprocessor controller (501) and a memory (502) storing data including an ID code. The lock microprocessor (601) changes the ID code stored in its memory (602) upon the operation of the lock by a correct key. The key (101) can only be used to operate the lock once and, thereafter must be reprogrammed by a host computer with the updated ID code for the lock. The electronic lock operates a solenoid (209) which retracts a bolt blocking mechanism (210) which prevents the unlocking of the bolt (202) even when a key having the correct mechanical key …
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
- Filed May 8, 1991 and granted April 15, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 2013.
- 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.