Diffusing imager and associated methods
CA 2329924 C · Owner: Hutchins, Robert · Inventors: Hutchins, Robert; Welch, W. Hudson; Feldman, Michael R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A diffusing function and a lens function are provided on a single surface which is formed from a computer generated hologram including free form regions (56) having a phase shift and the hologram being shifted within the free form regions by the phase shift relative to the hologram outside the free form regions and zero (52) and PI (50) regions are transposed in the free form regions.
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 April 23, 1999 and granted November 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2021.
- 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.