Basement fire escape
CA 2195586 A1 · Owner: Neumark, Keith S.J. · Inventors: Cranswick, David Maxwell; Neumark, Keith S.J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A combination of frames and a ladder which comprises an outer frame which would be positioned into a wall of a basement near the ceiling and above the ground or with a excavated area adjacent to it to enable persons to escape the basement without hindrance from the ground. This outer frame houses an inner frame which could contain a window or could be a solid device however usually it would contain a window to allow light and vision of the outside where the user would escape to. This inner frame is connected to the outer frame by an assembly of sliders and spacers which allow the inner frame to move inwardly into the basement and begin sliding in a downward motion between the beams of the …
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 January 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2019.
- 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.