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:
Mar. 22, 1988
Filed:
Mar. 10, 1986
Applicant:
Inventor:
Philip S Crosby, Portland, OR (US);
Assignee:
Textronix, Inc., Beaverton, OR (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
3241 / ; 324 713 ; 324 / ; 2504922 ;
Abstract
A testing method and apparatus employs electron beam writing and reading of conductive paths in a circuit device rather than physical probing of conductive elements. Portions of the circuit device, e.g., conductive paths, are bistably stored at a given potential and then the device is read by a reading beam to determine if proper connections exist. Read out is at comparatively high levels represented by the difference between bistable voltage values. Once a portion of the device has been tested, it may remain in stored condition such that additional cross checking or repetition of testing is rendered unnecessary.