Method of making frangible seal
CA 1112417 A · Owner: Baxter Travenol Laboratories, Inc. · Inventors: Winchell, David A.; Fowles, Thomas A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
David A. Winchell Thomas A. Fowles, ABSTRACT OF THE DISCLOSURE A method is provided for forming a fracturable seal of the type wherein a plastic cup-shaped closure is hermetically sealed to a plastic planar surface such as, the neck of pharmaceutical solution containers. The seal is formed with the closure by forcing a die heated above the melting point of the plastic material into the planar surface, with the sealing die also being in heat exchange relationship with a portion of the closure. Both the planar surface and the closure adjacent thereto become molten and the surface material is displaced to form a fused seal transverse to the surface. The surface is depressed at least 0.005 inch …
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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 1998.
- 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.