Stairway
CA 2194529 A1 · Owner: Marttinen, Alpo L. · Inventors: Marttinen, Alpo L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A unique set of stairs forms the subject matter of the present invention. A plurality of dove-tail shaped flanged brackets are attached to the inner sides of a set of stringers at pre-determined intervals. Once the proper rise and run is determined and the stringers levelled accordingly a template is used to secure the dove-tail brackets such that the top flange is horizontal and parallel to the floor. Thereafter a plurality of stair treads are fit within opposing pairs of dove-tail hangers and are secured from the rear by a wedge. Optional risers are then set in place and the stairs are complete. The stairway can be constructed with a minimal amount of tools by an average home owner very …
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 7, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 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.