System of detecting optical distortion of a light-transmitting platelike member
CA 2095303 A1 · Owner: Matsushita, Yoshimitsu · Inventors: Koyama, Takayuki; Matsushita, Yoshimitsu; Miyake, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
When a predetermined region of a lighttransmitting platelike member, such as a front windshield is divided into a plurality of small parts to detect its optical distortion, and a target is sensed in turn through each small part of the region by image sensing means according to one aspect of this invention the target has at, least three light emitting points capable of representing at least one angle, according to another aspect of this invention, the target represents at least two segments capable of forming at least one predetermined angle and, according to further aspect of this invention a plurality, of unit targets are arrayed in a predetermined direction the image sensing means is …
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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 April 30, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2015.
- 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.