Manufacture of pipe couplings
CA 1069152 A · Owner: Hepworth Iron Company Limited (The) · Inventors: Glover, John B.; Upton, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Plastics pipe couplings comprising a plastics sleeve and sealing rings therein are integrally moulded in two-step injection moulding process employing movable core assemblies for moulding, in different core positions the, sealing rings and the sleeve. To enable the core assemblies and the moulded coupling to be separated by purely axial movement, the sealing rings and/or sleeve are provided with regions or increased internal diameter into which the sealing rings are deformed in the course of said movement. A peripheral groove in each core assembly for moulding the sealing ring is defined between two core members which can be separated to release the sealing ring before effecting the axial …
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 January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
- 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.