Lens injection-compression-molding method
CA 2201796 C · Owner: Hoya Corporation · Inventors: Saito, Kiyohiro; Asami, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an injection step, actual injection speed V is closed-controlled so that the actual injection speed V becomes equal to first or second preset speed V1 or V2 while comparing the actual injection speed V with the first or second preset speed V1 or V2 in the section between S0 and S1 from the time when injection of molten resin is started up to the time when the molten resin reaches this side of a gate portion 46 or the section between S1 and S2 from the, time when the molten resin reaches this side of the gate portion 46 up to the time when the molten resin reaches the inside of a cavity 3. The injection speed V is open- controlled to third preset speed V3 in the section between S2 and S3 …
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 4, 1997 and granted September 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 2019.
- 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.