Retroreflective vehicle identification articles having improved machine legibility
CA 2020380 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Look, Thomas Finley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
Improved vehicle identification articles such as, license plates or license tabs employ materials, selectively absorptive or transmissive in the near infrared spectrum. The absorptive materials may form non-alphanumeric recognition symbols, alphanumeric characters in addition to the license number or the, license number itself. In preferred embodiments the, symbols are alphanumeric characters chosen from a font more easily read by vehicle identification equipment than other fonts. Retroreflective image analysis systems suitable for use with the articles are described. PFAPP8.12
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.
Why it's free to use
- Filed July 4, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 2012.
- 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.