Projector system with light pipe optics
CA 2348386 A1 · Owner: Torch Technologies Llc · Inventors: Levis, Maurice E.; Gourley, Helen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A projector system includes a lamp (10) a reflector collector optic (11), relay optics (18 19) to image light from a light pipe (15) exit pupil to an image gate of an image forming means (21) such as a film gate or an LCD , panel. The light pipe is hollow and has cold mirror reflecting internal walls is tapered in shape, and has an entrance pupil which is larger than a center section in cross section. The light pipe mixes the light by internal reflection and produces light which is uniform in color and intensity across the exit pupil.
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 30, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2020.
- 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.