Distributing material in blow mold head
CA 2038288 A1 · Owner: Ruetalo, Alberto F. · Inventors: Ruetalo, Alberto F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A blow head for blow molding thermoplastic products includes a casing and a concentric assembly of mandrels aligned with a predetermined flow axis. The mandrels and casing cooperate to define distinct concentric flow channels. A former shapes molten thermoplastic materials discharged from the flow channels into a single tube with a selected cross-sectional thickness. Spiral grooves are formed in external surfaces of the mandrels to distribute material more evenly around an associated flow channel. Each mandrel has a circumferential chamber for receiving thermoplastic material under pressure and supplying the material to upstream ends of the flow channel and grooves associated with the …
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 March 14, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 14, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2013.
- 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.