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:
Feb. 20, 1979
Filed:
May. 02, 1978
Applicant:
Inventors:
James F Francis, Poughkeepsie, NY (US);
Eric W Hearn, Wappingers Falls, NY (US);
Ralph G Dessauer, Wappingers Falls, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 12 ; 73-7 ;
Abstract
A holding assembly for impact sound stressing semiconductor wafers and the like including a novel fixture for securing the wafer across a sound tube by clamping between Teflon rings. A cover membrane is also secured across the sound tube to create a closed space defined by the sound tube, cover membrane and semiconductor wafer. Tungsten spheres located in the closed space bounce between the wafer and the membrane when vibrations are propagated in the sound tube for impact sound stressing the semiconductor wafer.