PATENT CLAIM ANALYSIS

Application Number: 15892660
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-08
Patent Classification: ["117", "011000"]

Abstract:
Disclosed herein is an SiC wafer producing method for producing an SiC wafer from a single crystal SiC ingot. The SiC wafer producing method includes a wafer producing step of separating a part of the ingot along a separation layer as an interface. The wafer producing step includes the steps of immersing the ingot in a liquid and applying the ultrasonic wave from an ultrasonic vibrator through the liquid to the ingot, the ultrasonic wave having a frequency greater than or equal to a critical frequency close to the natural frequency of the ingot.

Claim (Index 1):
An SiC wafer producing method for producing an SiC wafer from a single crystal SiC ingot having an end surface, a c-axis intersecting said end surface, and a c-plane perpendicular to said c-axis, said SiC wafer producing method comprising:\n a separation layer forming step of setting a focal point of a laser beam having a transmission wavelength to single crystal SiC inside said SiC ingot at a predetermined depth from said end surface, said predetermined depth corresponding to a thickness of said SiC wafer to be produced, and next applying said laser beam to said SiC ingot, thereby forming a plurality of modified portions on said c-plane at said predetermined depth and also forming a plurality of cracks isotropically formed on said c-plane so as to extend from each modified portion, each modified portion being a region where SiC has been decomposed into Si and C, said modified portions and said cracks constituting a separation layer along which said SiC wafer is to be separated from said SiC ingot; and a wafer producing step of, after the separation layer forming step, separating a part of said SiC ingot along said separation layer as an interface, thereby producing said SiC wafer; said wafer producing step including the steps of immersing said SiC ingot in a liquid in the condition where said end surface of said SiC ingot is opposed to an ultrasonic vibrator for generating ultrasonic wave, and next applying said ultrasonic wave from said ultrasonic vibrator through said liquid to said SiC ingot, said ultrasonic wave having a frequency greater than or equal to a critical frequency close to the natural frequency of said SiC ingot.

Metadata:
- Claim Count in Document: 11.0
- Percentile: 88.0
- Lexical Diversity: 2.04167
- Patent Class: 117.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15833556', '15821045', '15611363', '15883297', '15663189']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8149146909996106
- 35 USC 102 Novelty (BERT): 0.5879266505380505
- Combined Prediction Score: 0.7922158869534546
- Mean Citation Score: 444.386672
- Max Citation Score: 490.8873
- Similarity Product: 481.830799010378

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test