Optical radius gauge
CA 2013337 C · Owner: Donaldson, Charles Wayne · Inventors: Donaldson, Charles Wayne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A non-contacting system for measuring the radius of a curved surface. The system includes a light source for illuminating the surface along the intersection of the surface with a plane which includes the radius to be measured. A lens arranged, such that its principal axis is perpendicular to the plane which includes the radius to be measured is, utilized to project a distortion free image of the intersection onto the photosensitive array within a video camera. The video signal generated by the camera is provided to a microcomputer which calculates surface radius from the image data included in the video signal.
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 March 29, 1990 and granted March 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 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.