Replaceable closure system
CA 2126550 C · Owner: Russell-Stanley Corporation · Inventors: Hunter, John; Mcgrath, Michael; Hudson, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drum closure system is provided for protecting the integrity of the threads of a drum neck and for providing the safe and easy installation of a replaceable closure neck. The drum closure system primarily comprises a drum with a drum neck integrally formed in the drum top, a closure plug a replaceable, closure neck which is interposed threadably between the drum neck and the closure plug, and a specialized tool for installing and removing the replaceable closure neck. The use of the tool which is designed to enable exertion of very high levels of torque on the replaceable neck, eliminates the need for a locking mechanism between the replaceable neck and drum neck because insertion of 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 June 22, 1994 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2016.
- 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.