Electronic combination lock with high security features
CA 2071577 A1 · Owner: Mas-Hamilton Group · Inventors: Harvey, Michael P.; Miller, James C.; Dawson, Gerald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electronic combination lock having a self contained power generation capability is further rendered more secure from attempts to open the lock by an unauthorized individual by requiring the checking the conditions of the lock operation against preset requirements so that if the lock is operated in a manner that indicates that the lock is being operated by a manipulator of if the lock is being randomly operated by a person, the lock will refuse to open or becomes inoperable. Conditions that may be checked by the lock and compared to preset standards include: entry of the combination is too short a period of time, the entry of the combination over too long a period of time, the amount of …
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 June 18, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2014.
- 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.