Cube corner cavity based retroreflectors and methods for making same
CA 2356418 A1 · Owner: Smith, Kenneth L. · Inventors: Nachbor, Mark D.; Smith, Kenneth L.; Benson, Gerald M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Retroreflective sheeting includes a body layer (12) having a structured surface with recessed faces (22) and top surfaces (20) the recessed faces , forming cube corner cavities. The recessed faces have a high specular reflectivity, while the top surfaces have a low specular reflectivity. In some embodiments, a substantially continuous film of reflective material covers the structured surface, and a masking substance is provided over the reflective material at the top surfaces. Alternatively the top surfaces are given a non-, smooth surface finish so that the film of reflective material on those portions has a diffuse reflectivity. In other embodiments the film of reflective material …
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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 May 13, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 13, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 13, 2021.
- 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
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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.