Patent ID: 9604877
Date: 2017-03-28
CPC Classifications: C03C,C23C,H01J

Claim:
1. A method for increasing strength of a glass substrate, the method comprising: having at least one plasma torch comprising at least first and second electrodes facing at least a first major surface of the glass substrate; spraying a plasma comprising replacement ions through a nozzle of the plasma torch facing the first major surface of the glass substrate via an applied asymmetric varying electric field between the two electrodes such that the plasma is sprayed proximate the first major surface of the glass substrate; providing the asymmetric varying electric field between the first and second electrodes, including increasing asymmetry between voltage half-cycles, in order to drive the replacement ions into the glass surface to a depth in the glass substrate of at least 100 micrometers in order to increase the strength of the glass substrate.