Manufacture of thermoplastics pipe
CA 1164179 A · Owner: Imi Yorkshire Imperial Plastics Limited · Inventors: Aston, William C.; Walker, Derek
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mould for use in the manufacture of thermoplastics eg PVC pipe by radial, expansion of a pipe blank the mould, comprising a cylindrical central portion 10 and two removable mould end portions 11 12. The pipe blank 14 is located centrally within the mould by mandrels 13 within each mould end portion 11, 12. Water inlet/outlet ports 15, 16 are provided in each mould end portion 11, 12 to admit water to and remove it from the region between the blank 14 and the mould walls, and the mandrels 13 are hollow to permit inlet/outlet of water through the interior of the blank 14.
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 March 27, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2001.
- 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.