Asymetric cube corner article and method of manufacture
CA 2173231 A1 · Owner: Benson, Gerald M. · Inventors: Benson, Gerald M.; Smith, Kenneth L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed for manufacturing a cube corner article (191) comprising the steps of providing a machinable substrate material suitable for forming reflective surfaces and creating a plurality of geometric structures including cube comer elements (198-203) in the substrate. The step of creating the cube corner elements ( 198-204) comprises directly machining at least three sets of parallel grooves (197. 196 195) in the substrate so that only, one side of at least one groove in at least one groove set forms cube corner elementoptical surfaces.
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 20, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2016.
- 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.