Retroreflective article and method of making same
CA 2188141 C · Owner: Minnesota Mining And Manufacturing Company · Inventors: Lightle, Vera L.; Billingsley, Britton G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A retroreflective article has first (32) and second (34) segments each comprising a binder layer and a multitude of microspheres (36) partially embedded in the front surface of the binder layer (42). The first segment also has an opaque reflective metal layer (38) disposed on the embedded portions of the microspheres; whereas the second segment lacks such an opaque reflective metal layer and thereby allows the color of the underlying binder layer to be seen from the front side of the retroreflective article. The first and second segments display noticeably different colors under daytime lighting conditions and each possesses a distinctly different retroreflective efficiency when viewed …
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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 28, 1995 and granted May 20, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.