Optical slit lamp apparatus
CA 2000747 A1 · Owner: Burchill, Denis · Inventors: Burchill, Denis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical slit lamp apparatus for conducting a visual examination of the human eye, comprises an objective lens for forming an image of the eye under examination in an image plane, and a compound eyepiece for viewing the thus formed image. The image plane is common to the object plane of the eyepiece. The eyepiece is constructed such that the image plane lies between the objective lens and the eyepiece and a graticule is located in the common image/object plane the graticule bearing graduations spaced such that when viewed through the eyepiece they represent actual dimensions of the eye under examination.
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 16, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 16, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2011.
- 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.