Method affording an easy opening device for nonwoven thermoplastic fiberenvelopes
CA 1310618 C · Owner: Sheehan, Richard L. Jr. · Inventors: Morris, Wayne K.; Sheehan, Richard L. Jr.; Pochardt, Donald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of forming one or more score lines or bands of weakness in a web formed of nonwoven thermoplastic fibers requires the application of sufficient energy such as ultrasonic energy to narrow bands of the web to change the fibers to a film. An envelope formed of tough nonwoven thermoplastic fibers for use in shipping documents may be formed with an easy open device by forming score lines in the envelope and the envelope and, if necessary may be, reinforced in the area of the score lines by a strip of oriented pressure-sensitive adhesive reinforcing tape applied over the bands and adjacent surfaces of the envelope on the interior side of the envelope and a tear tape may be applied to the …
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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 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 2009.
- 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.