Key stopper
CA 2045391 A1 · Owner: Frederic, Ambrose · Inventors: Frederic, Ambrose
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a supplementary door locking device for apartments or condominiums, it is known to prevent a locked door from being opened - from the outside - via the use of a stolen key or any key. The invention is attached to the inside of the door against the door latch handle, restricting its movement as well as the movement of the internal bolt that the door latch handle is connected to - thus keeping the door locked. There are no tools needed to install this device; and when required, it can be quickly and easily put in place and removed by only the use of ones' hands.
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 25, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 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.