Roof snowclearing device
CA 2091619 C · Owner: Roy, Gaetan · Inventors: Roy, Gaetan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The roof scraper that is currently on the market is used to remove accumulated snow from pitched rooves canvas shelters, greenhouse glass, etc. It consists of a plastic blade at the end of a long sectional handle. There is a curve of approximately 30 degrees in the handle about 45 cm from the blade in order to make it easier for the leading edge of the blade to sink into the snow when it is pulled towards the user. Consequently the scraper cannot be used to push snow. It can be used from the ground to remove snow from low rooves only. To remove snow from high rooves users must expose themselves to a certain amount of risk by standing on a ladder. Canadian patent 2,038,348 is for a tool for …
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 March 15, 1993 and granted May 5, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 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.