Method of making a molded plastic container
CA 2191093 C · Owner: Ruppman, Kurt H. Sr. · Inventors: Ruppman, Kurt H. Sr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyethylene terephthalate (PET) preform (11) having a capped cylindrical body (13), a threaded top and collared neck (19) is preheated to soften the PET.The preform (11) is placed in a split mold (26) whose walls are heated to a temperature between 150°C and 177°C. A stretch rod (35) inserted through the, top of the preform (11) stretches the preform (11) axially until the preform is the length of the final product (49). The preform (11) is expanded using compressed ambient air, and is molded against the walls (27 29) of the mold (26). The air is, vented and dry nitrogen at a temperature below -50°C is injected into the molded preform (47) to purge and cool the molded preform (47) while …
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 7, 1996 and granted August 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 7, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2018.
- 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.