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:
May. 17, 2005
Filed:
Aug. 18, 2003
Applicants:
Frank Yauchee Hui, Orlando, FL (US);
Robert Y S Huang, Ocoee, FL (US);
Inventors:
Frank Yauchee Hui, Orlando, FL (US);
Robert Y S Huang, Ocoee, FL (US);
Assignee:
Agere Systems Inc., Allentown, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L021/66 ;
U.S. Cl.
CPC ...
Abstract
An apparatus and method for identifying integrated circuit chips or dice on a semiconductor wafer. Each chip comprises a ring oscillator having a characteristic oscillating frequency different from the oscillating frequency of the ring oscillators of other chips on the same wafer. Each chip can be associated with various attributes of the wafer on which it was formed and the process steps to which it was subjected using the ring oscillator frequency.