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. 12, 2019
Filed:
Apr. 21, 2016
Applicant:
Apple Inc., Cupertino, CA (US);
Inventors:
Assignee:
APPLE INC., Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C 21/00 (2006.01); H05K 5/03 (2006.01); C03C 3/00 (2006.01); C03C 4/18 (2006.01); H05K 5/00 (2006.01);
U.S. Cl.
CPC ...
H05K 5/03 (2013.01); C03C 3/00 (2013.01); C03C 4/18 (2013.01); C03C 21/003 (2013.01); H05K 5/0017 (2013.01); H05K 5/0086 (2013.01); C03C 2204/00 (2013.01);
Abstract
Glass articles having a base layer formed of glass and having a first compressive stress, an adjacent compression layer formed in the glass and having a second compressive stress, and a witness layer formed in the glass adjacent the compression layer and having a third compressive stress. The first, second and third compressive stresses all differing from one another. The witness layer also having a higher index of refraction than an index of refraction for the base or compression layers. Methods for manufacturing and methods of quality control that include the use of the witness layer are also disclosed.