Multi facet traction device
CA 2072432 A1 · Owner: Rubel, Edward R. · Inventors: Rubel, Edward R.; Rubel, Edward R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A traction device including a bit having a penetrating surface for penetrating a riding surface. The penetrating surface defines the cross sectional area of the bit and includes a plurality of facets wherein each facet intersects a common vertex. In a second embodiment the, penetrating surface defines an oval cross section transverse to the direction of penetration into a riding surface, wherein the circumference of the cross section increases as the distance from the tip increases. -12-
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 June 26, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2014.
- 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.