Construction unit suitable for making stair stringers
CA 2099509 C · Owner: Reimann, Lyall V. · Inventors: Reimann, Lyall V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A construction unit (10) which is suitable for use in the fabrication of a stair stringer is provided. In one embodiment the unit has three side members (12, 14 16) which form a right triangle. The side member (16) forming the hypotenuse of the right triangle has a flat surface for locating the unit (10) against a flat support surface. The side members (12, 14) forming the other two sides of the right triangle are provided with channels (22) extending along their lengths, each for receiving the edge of a stair tread (28) or stair riser (30) forming sheet therein.
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 July 2, 1993 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2015.
- 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.