Lens casting mold
CA 1235263 A · Owner: Pilkington Barnes Hind, Inc. · Inventors: Jakoski, John C.; Rostoker, Martin V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is a lens casting mold and a process, for using same, in making an optical lens. The casting mold comprises a cup-shaped element which forms a first optical surface in the lens blank upon polymerization of a casting liquid and an internally threaded tubular element for mounting the casting mold on a threaded precision mandrel. The subsequent optical surface is generated and finished.
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
- Granted April 19, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 19, 2005.
- 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.