Invention Application
- Patent Title: COLORED MULTILAYER OXIDE COATINGS
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Application No.: US15233728Application Date: 2016-08-10
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Publication No.: US20180049337A1Publication Date: 2018-02-15
- Inventor: James A. CURRAN , Karin H. RASMUSSEN , Zechariah D. FEINBERG
- Applicant: Apple Inc.
- Main IPC: H05K5/02
- IPC: H05K5/02 ; H05K5/04 ; C23C14/10 ; C25D11/24

Abstract:
Colored oxide coatings having multiple oxide layers are described. Processes for forming the multilayer oxide coating can include converting a portion of a metal substrate to a primary oxide layer, coloring the primary oxide layer, and depositing a secondary oxide layer on the primary oxide layer. The primary oxide layer and the secondary oxide layer can be at least partially transparent such that a texture of an underlying metal substrate surface is visible through the multilayer oxide coating. A top surface of the secondary oxide layer can be polished to a high gloss to give the multilayer oxide coating an appearance of depth.
Public/Granted literature
- US11352708B2 Colored multilayer oxide coatings Public/Granted day:2022-06-07
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