Method for adding strength to a container
CA 2218822 A1 · Owner: Rubbermaid Incorporated · Inventors: Conn, Wendell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved mthod of blow molding a hollow article is disclosed comprising the adaptation of a die pin (26) to include spaced apart channels (38) therein that extend from top to bottom along the sides of the die pin. The channels create reinforcement ribs (70) along the inside surface (68) of a formed parison (30). The ribs expand with the parison into a final form and serve to reinforce the resultant body while being visible only from the inside. The channels (38) are each bifurcated to provide a segment (44) below a shut-off surface (46) in which plastic exiting the die pin can expand to form ribs (70) of substantial thickness. Portions of the parison sidewalls (66) between the ribs (70) …
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 October 21, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 21, 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.