Method and apparatus for determining the optical properties of a lens
CA 2103049 C · Owner: Leica Microsystems Inc. · Inventors: Luce, David A.; Percival, Christopher J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Optical properties of a lens, including localized defects are determined by , analyzing the refracted image produced by transmitting a beam of light through an aperture (16) and a lens (12) to be tested. The image is reflected onto a light sensitive detecting surface (20). Information obtained from the light detecting surface is digitized and sent to an image processing unit (24) which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses (30 32) may be employed, either permanently or selectively to alter the refracted, beam before the beam intersects the detective …
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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 March 5, 1993 and granted October 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 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
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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.