Laminated roofing shingle
CA 2205859 C · Owner: Elk Corporation Of Dallas · Inventors: Weaver, Casimir Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shingle (20) is provided having a headlap section (32) and a buttlap section (34) with at least one portion of the buttlap section having a relatively uniform color and/or value and an adjacent portion of the buttlap section having a value gradation from light to dark. A plurality of horizontal striations (52, 54, 56) with transition stripes (152 154) disposed between , adjacent horizontal striations may be used to establish the desired value gradation. An illusion of depth or shingle thickness is created on the portion of the buttlap section having the value gradation. The buttlap section defines in part the exposed weather surface (42) of the associated shingle. The relatively …
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 November 30, 1995 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.