Irregular tessellated building units
CA 2669449 C · Owner: Keystone Retaining Wall Systems, Inc. · Inventors: Riccobene, Thomas S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An irregular, tessellated building unit comprises x primary elements wherein x is an integer equal to or greater than 1. The primary element (20) is a rotational tessellation having a plural pairs of sides extending in a generally radial direction from plural vertices respectively. In each pair, the two sides are rotationally spaced by an angle that is divided evenly into 360 degrees. Preferably all of the sides are irregularly shaped but one or more sides could be wholly or partially straight. Optionally spacers are provided on the sides of each unit. A wide variety of units may be constructed having different numbers and arrangements of primary elements (20). As all the units are …
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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 24, 2004 and granted March 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 2026.
- 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.