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:
Sep. 20, 1977
Filed:
Jun. 01, 1976
Charles R Fegley, Laureldale, PA (US);
Richard H Winings, Lawrence, PA (US);
Clifford R Yeich, Jr, Reading, PA (US);
Western Electric Company, Inc., New York, NY (US);
Abstract
In making semiconductor devices such as integrated circuits, semiconductor wafers are often sorted according to both their thickness and their resistivity. To so sort the wafers they are moved successively along a first track to a thickness determining device which produces a signal indicative of the thickness of each wafer. This signal is stored by a computer. Continued successive movement of the wafers brings them to a resistivity determining device. This device, which is rendered effective by the stored thickness signal, produces a signal indicative of the resistivity of each wafer. The resistivity signal is stored by the computer. The successive movement of the wafers is continued along the first track to move them onto a second track. Each article is moved successively along the second track. And, in response to the stored signals, each article is moved into a preselected position associated with both the thickness and the resistivity of each article.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile