Concrete breaking apparatus
CA 2202146 C · Owner: Roth, Scott R. · Inventors: Roth, Scott R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A concrete breaking appa-, ratus (10) includes a non-circular multi-lobed impact roller (16) con-, nected via an axle (18) to a wheeled frame (22) such that the roller rolls, upon the ground as the frame (22) is towed by a tractor (12). Each lobe, (20) of the roller includes a ridge (30) extending across the width of, the roller (16) and projecting outwardly from the impact surface of, each lobe (20) along a line parallel to the axle (18) and generally cen-, trally located within the dynamic impact region of the impact sur-, face (26). The ridge (30) may take various configurations, including a, triangular cross section a semi-, circular cross section, and a plurality of spaced-apart …
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 October 18, 1995 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2017.
- 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.