Method and device for shaping plastic optical lenses by chip removal
CA 2494375 A1 · Owner: Carl Zeiss Ag · Inventors: Hanssen, Adalbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method and a device for shaping plastic optical lenses (10) by chip removal. The invention is characterized in that the chips are removed by turning. Moreover, the location at which the chip is to be removed on the lens (10) is subjected to punctual cooling by means of a , nozzle (36), at a temperature whereat the plastic material is embrittled such that the chip is broken into bits and can be evacuated by suction.
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 July 2, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 2, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2025.
- 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.