Method of removing the sprue from an injection moulding
CA 2256741 A1 · Owner: Krauss-Maffei Kunststofftechnik Gmbh · Inventors: Schieberl, Eric; Hillenbrand, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to remove the sprue (5) from an injection moulding (1) such as a delicate recording-medium disk, e-g- a CD without producing dust and without , the need for complex mechanical operations the invention proposes that most , the hole (20) in the disc is produced by injection moulding and the rest of the hole by removing the sprue from the mounding by a laser (6) once the moulding has been taken out of the mould.
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 June 24, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 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.