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:
Jul. 28, 1998
Filed:
Jan. 30, 1997
Applicant:
Inventors:
Donald D Palmer, Jr, Chesterfield, MO (US);
Ronald D Stoddard, St. Louis, MO (US);
Mark S Conradi, St. Louis, MO (US);
Assignee:
McDonnell Douglas Corporation, St. Louis, MO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V / ;
U.S. Cl.
CPC ...
324300 ; 324307 ;
Abstract
Thermal damage in resin-matrix composite materials is detected using a low field NMR nondestructive testing technique. The technique involves subjecting the resin-matrix composite material to an NMR measurement of the spin-lattice relaxation (T.sub.1) at a low magnetic field strength and/or the spin-lattice relaxation of local field order (T.sub.1D) at any field strength. Thermal damage is evident as an increase in T.sub.1 and T.sub.1D.