PATENT CLAIM ANALYSIS

Application Number: 15898948
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-06
Patent Classification: ["073", "763000"]

Abstract:
Methods of characterizing ion-exchanged chemically strengthened glass containing lithium are disclosed. The methods allow for performing quality control of the stress profile in chemically strengthened Li-containing glasses having a surface stress spike produced in a potassium-containing salt, especially in a salt having both potassium and sodium. The method allows the measurement of the surface compression and the depth of the spike, and its contribution to the center tension, as well as the compression at the bottom of the spike, and the total center tension and calculation of the stress at the knee where the spike and the deep region of the stress profile intersect. The measurements are for a commercially important profile that is near-parabolic in shape in most of the interior of the substrate apart from the spike.

Claim (Index 16):
A method of characterizing a stress profile of a chemically strengthened glass substrate formed by diffusion of alkali ions and having an upper surface and a body, a shallow spike region of stress immediately adjacent the upper surface and a deep region of slowly varying stress within the body and that intersects the spike region at a knee, wherein the method comprises:\n measuring a TM mode spectrum and a TE mode spectrum of the glass substrate, wherein the TM mode spectrum and the TE mode spectrum each include mode lines and a transition that corresponds to a critical angle; determining a surface compressive stress CS sp  of the spike using either at least one of the TM and TE mode spectra or a measurement of a surface concentration of at least one type of alkali ion that resides adjacent the surface; measuring a difference between the TE and TM transition locations to determine an amount of birefringence BR, wherein BR is given by:\n BR=n LM TE \u2212n LM TM  \n where n LM TE  is the effective index of a highest-common-order TE spike mode, n LM TM  is the effective index of a highest-common-order TM spike mode; and\n calculating a knee stress as CS k  using the equation:\n CS k =K 3 \u00d7BR /SOC \n \n where SOC is the stress-optic coefficient, and K 3  is a calibration factor that is in the range between 0.2 and 2.

Metadata:
- Claim Count in Document: 17.0
- Percentile: 88.0
- Lexical Diversity: 1.92958
- Patent Class: 73.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: False
- Related Applications: ['15267392', '15171490', '14966642', '14707431', '14289056']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7060410584265702
- 35 USC 102 Novelty (BERT): 0.662234726847714
- Combined Prediction Score: 0.7016604252686846
- Mean Citation Score: 381.27828
- Max Citation Score: 632.89905
- Similarity Product: 623.5335321722924

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test