Dynamically balanced screw with concealed loading weights
CA 2096259 C · Owner: Tenco Inc. · Inventors: Vohl, Jean-Rene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An endless spiralling screw for a snowblower comprising a rotatable elongated shaft, to be power driven; a first elongated, rigid sheet, integrally mounted to the shaft at a radially inward edge of the sheet and spiralling lengthwisely of the shaft, the main portion of the sheet having a substantially straight section, the external marginal portion of the sheet being folded relative to the main portion thereof the plane of the main, portion being located downstream relative to the direction of rotation of the endless screw; at least a few reinforcing struts being anchored to the spiral sheet and having a smaller external diameter than the spiral sheet, and being fixedly connected thereto …
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 May 14, 1993 and granted August 12, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 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.