Holographic operating optical apparatus
CA 2020095 A1 · Owner: Seiko Instruments Inc. · Inventors: Yamamoto, Shuhei; Mitsuoka, Yasuyuki; Iwaki, Tadao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is directed to holographic apparatus having an interferometer for concurrently irradiating an image recording medium by a writing reference light composed of spherical or plane wave and a signal light containing image information to interfere with each other to record a hologram, and means for irradiating the hologram by a reading reference light in the opposite direction of the reference light to thereby reconstruct the image information. The image recording medium is comprised of a photoconductive layer, an optical reflective layer a, pair of liquid crystal alignment layers a ferroelectric, liquid crystal layer having bistable memory characteristic between its optical …
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 June 28, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 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.