Chimney cleaning device
CA 1287708 C · Owner: Wolfanger, Louis N. · Inventors: Wolfanger, Louis N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for cleaning a chimney flue having four side walls which comprises a rigid elongated shaft a fixed mounting plate, means attached at one end of said elongated shaft four scraping, blades attached to said mounting plate means so as to collectively define a substantially rectangular or square perimeter, each of said blades having a scraping end and a fixed end pivotably attached to said mounting plate means remote from said scraping end, and means attached to said shaft within said perimeter for expanding and contracting said blades to permit cleaning of said four side walls of said flue at the same time.
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
- Granted August 20, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2008.
- 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.