Cavity forming in plastic body
CA 2066334 A1 · Owner: Adler, Meryle D. W. · Inventors: Shafer, Harold G. Jr.; Nelson, John W.; Adler, Meryle D. W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for forming a cavity in a rigid, organic plastic body comprises an abrading tool mounted on a carrier, and means for driving the tool while it is moved through an arc. In a preferred embodiment the, organic plastic body is an ophthalmic lens blank and the, cavity has the size and shape of a segment for a multifocal lens.
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 16, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 2014.
- 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.