Multilayer bottle with separable inner layer
CA 2100758 C · Owner: Collette, Wayne N. · Inventors: Schmidt, Steven L.; Collette, Wayne N.; Krishnakumar, Suppayan M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multilayer plastic container (50) for use with either a positive or negative pressure dispensing system (10) the, container having an integral body with an inner layer (58) which readily separates from an outer layer (59) and collapses to dispense a product from the container. The container is formed by blow-molding a multilayer preform and a bottom, aperture (57) is formed in the container for injecting air to separate the inner layer from the outer layer. Preferably the, inner layer is predelaminated during manufacture to facilitate its later separation during use. In the case of vacuum dispensing, air inlet vent holes are preferably formed at the points of maximum deformation to …
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 January 10, 1992 and granted July 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 10, 2014.
- 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.