Method of and apparatus for determining number of sheets in a stack
CA 1137223 A · Owner: Ppg Industries, Inc. · Inventors: Decker, Forrest W.; Peternel, Jacob R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Reflected energy density signal as a function of distance in pulse counts determined from a side of stacked sheets is used to calculate sheet pulse counts. A working pulse range is determined from the nominal thickness range of the stacked sheets and thereafter pulse values within the working pulse range are selected. The calculated sheet pulse counts and selected pulse values are compared and acted on to develop a pair of sheet counts for each selected pulse value. The pair of sheet counts occurring at least 10 consecutive times is considered the number of sheets in the stack.
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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 December 7, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 7, 1999.
- 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.