Apparatus for detecting the passage of multiple superposed sheets along a feed path
CA 1306032 C · Owner: Ncr Corporation · Inventors: Milne, Douglas L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A linear variable differential transformer (42) produces an output voltage which varies linearly with movement of the axis of a movable axis roller (14) relative to the axis of a fixed axis roller (12) brought about by the passage of a sheet between the rollers. Circuits (154, 189) store a reference voltage representative of a minimum value of said output voltage during one revolution of the fixed axis roller, and subtracting circuits (162, 172) subtract the reference voltage from said output voltage when a single or multiple sheet is passing between the rollers so as to produce a difference value representative of the thickness of this sheet. A processor (178) …
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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 August 4, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 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.