System for measuring the relaxed length of a moving web
CA 2042045 A1 · Owner: Punater, Dinesh G. · Inventors: Montgomery, Robert M.; Punater, Dinesh G.; Dessert, Robert A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for measuring the repeat length (L) of a moving web (20) includes forming a plurality of detectable marks (80) along the length of the web (20) at a repeated length interval. First (70) and second (72) detectors positioned along the web path are separated by known distance (S). The repeat length (L) of the web is obtained by detecting a mark (80) moving past the first detector (70) and then detecting the next mark (80) moving past the second detector (72), determining the time (t) separating the detections, and measuring the speed (V) of the moving web (20) wherein the repeat length (L) is calculated using the formula L=S+Vt.
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 August 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2012.
- 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.