This week the US Patent & Trademark Office published a patent application from Apple that relates to new protective coatings being added to Apple apparatus in the future that will prevent damage to home structures, transparent members connected with optical component windows and displays, and other device structures.

Patently Apple:
And:
The coatings might incorporate a binder material like polymer (occasionally known as a matrix or silicone matrix) and might comprise particles embedded inside the binder. The particles may have high hardness to enhance the durability of these coatings.
Better.

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