Pulse generating mechanism for a web-roll
CA 2055445 C · Owner: Eastman Kodak Company · Inventors: Earnhart, Edgar Gene
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pulse generating mechanism for a photosensitive web-roll (31), mounted for rotation within a light-tight cartridge (10), comprises a flange (22) on the web-roll (31): a plurality of activating means (44 46) on the flange (22) that are equally spaced angularly from each other and radially from the flange center; and sensing means (58) disposed outside the cartridge (10) for sensing movement of each activating means (44, 46) therepast, upon incremental rotation of the flange (22) and web-roll (31), and for generating pulses in response to said sensing for monitoring quantity of web remaining on the web-roll (31). Each activating means (44, 46) preferably comprises a ferromagnetic or …
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 April 3, 1991 and granted November 28, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2013.
- 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.