Apparatus and method for performing a work operation with a consumable web
CA 2201837 C · Owner: Boisvert, David P. · Inventors: Curry, Dwight; Webster, Ronald B.; Sullivan, Daniel J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A machine (10) and method of performing a work operation requiring a known or predetermined length of unconsumed web (W) has a cassette (18) containing consumable web material, and the cassette has an indicator (20,658,858) for identifying a length of unconsumed web in the cassette. The length of unconsumed web in the cassette is compared (32) to a known or predetermined length of unconsumed web required to perform the work operation, and the operation is performed if the length of unconsumed web in the cassette is at least equal to the required length of unconsumed web. In one embodiment the, indicator takes the form of a potentiometer (158,658,858) mounted on an exterior surface of 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
- Filed April 4, 1997 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 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
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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.