Method for manufacturing a spectacle-glass for myopes
CA 1263013 C · Owner: Hellstrom, Lars · Inventors: Hellstrom, Lars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method for manufacturing a spectacle-glass for myopes In accordance with the desired diopter value the required, curvature, and with torus-like grinding the so-called cross-cur-, vature is computed and according to the desired field of view a second curvature is computed, whereafter the glass is arranged in a generator and a center hollowing (3) is milled according to the basic curvature, while thereafter the glass edge (2) around the center hollowing (3) is milled according to said second curvature, and the center hollowing (3) of the thus-machined glass is finished, respectively polished by using a tool, with convex radiusing which corresponds to the basic curvature whereafter the edge …
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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
- Granted November 21, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 21, 2006.
- 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.