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:
Aug. 12, 1997
Filed:
Jan. 30, 1996
Wen-Bin Shieh, Nantou Hsien, TW;
Abstract
Disclosed is a template and a method for using the template for focus control of pattern definition image in lithographic process, particularly for IC production. The template has at least a serrated vernier and at least a rhombus printed thereon. In use, the template is mounted on a mask used for pattern definition during a lithographic process. Upon development of a wafer image of the mask, in the normal course of lithography, there is also visible on the wafer an image of the template. This image, particularly the rhombus pattern, can be easily visually inspected by quality control personnel. The rhombus pattern shows a defocus condition because its normally straight and parallel sides and corners show a roundness even with the slightest defocus. Wafers that have not been properly imaged during lithography can be discarded without wasting further process steps in IC production to enhance yield.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile