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:
Dec. 08, 1992
Filed:
Apr. 25, 1990
Kirk R Mackay, San Diego, CA (US);
Lawrence R Norpoth, Greer, SC (US);
The Expert System Technologies, Inc., San Diego, CA (US);
Abstract
The fractions of the phases of a composite material are determined utilizing a calibration relationship between at least one nondestructively measured quantity and a destructively measured phase fraction. The proper calibration relationship is selected from a multiple-variable regression relation, a single-variable regression of a product of two measured quantities, one of two single-variable regressions, or a weighted average of the results of two single-variable regressions, all four approaches utilizing nondestructive measurements of specimen consolidated height and specimen consolidated ultrasonic transit time. When prepreg material having uniaxial fibers is analyzed, multiple-layer specimens are formed by stacking the individual plies so that the fiber directions in adjacent layers are not parallel.