The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 1993
Filed:
Mar. 11, 1992
Ydo N Hoekstra, Joure, NL;
Klaas Dreuth, Ureterp; both of, NL;
Hadewe B.V., , NL;
Abstract
A method for verifying any of a plurality of predetermined compositions of multilayered units composed of stacked sheetlike parts passed in spaced succession by a checkpoint, including the steps of determining a first value according to a thickness of a first unit of a first predetermined composition; storing the first value as a reference value for the first predetermined composition; determining a second value according to a thickness of a successive unit intended to have the first predetermined composition; comparing the reference value with the second value; and rejecting the successive unit when the second value is outside a tolerance range around the reference value; wherein the first and second values are calculated from a plurality of measurements taken during at least one predetermined measuring interval along each of the first unit and the successive unit, respectively, at least one limit of the at least one measuring interval being related to the passage of a transverse edge of the respective unit such that the measurements are taken along a section of the respective unit having one end located a selected distance from said transverse edge where the measured thickness in the section is substantially uniform and representative of the composition of that unit.