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. 06, 1990
Filed:
May. 03, 1989
Michael K Norton, Los Gatos, CA (US);
Measurex Corporation, Cupertino, CA (US);
Abstract
A device, system, and method for measuring the strength of a sheet material during or after the manufacturing process are described. The present invention forms a chamber having one wall consisting of the sheet material to be tested. A high pressure air supply feeds into a reservoir which is in flow communication with the chamber by way of a valve. High pressure air is injected into the chamber, and the sheet ruptures. A pressure transducer measures the pressure in the chamber. The pressure measurements are differentiated, and a peck detector detects the peak derivative value obtained and thus the time at which the sheet ruptured. A computer determines the pressure in the chamber at the time that the sheet ruptured.