PATENT CLAIM ANALYSIS

Application Number: 15747849
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-08
Patent Classification: ["117", "106000"]

Abstract:
A method for producing an epitaxial silicon carbide single crystal wafer comprised of a silicon carbide single crystal substrate having a small off angle on which a high quality silicon carbide single crystal film with little basal plane dislocations is provided, that is, a method for producing an epitaxial silicon carbide single crystal wafer epitaxially growing silicon carbide on a silicon carbide single crystal substrate using a thermal CVD method, comprising supplying an etching gas inside the epitaxial growth reactor to etch the surface of the silicon carbide single crystal substrate so that the arithmetic average roughness Ra value becomes 0.5 nm to 3.0 nm, then starting epitaxial growth to convert 95% or more of the basal plane dislocations at the surface of the silicon carbide single crystal substrate to threading edge dislocations.

Claim (Index 9):
The method for producing an epitaxial silicon carbide single crystal wafer according to  claim 8  comprising, after said etching,\n feeding a silicon-based material gas and carbon-based material gas into said epitaxial growth reactor, \n epitaxially growing silicon carbide on the surface of said etched silicon carbide single crystal substrate to form a buffer layer, and \n then epitaxially growing silicon carbide on said buffer layer to form the device operating layer, and \n wherein a ratio C/Si of the number of C atoms with respect to the number of Si atoms of said silicon-based material gas and said carbon-based material gas at the time of forming the device operating layer is higher than the C/Si at the time of forming said buffer layer.

Metadata:
- Claim Count in Document: 45.0
- Percentile: 86.0
- Lexical Diversity: 1.98571
- Patent Class: 117.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15323655', '15032433', '13639309', '12735405', '15551871']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8108368913837375
- 35 USC 102 Novelty (BERT): 0.5384006102964504
- Combined Prediction Score: 0.7835932632750088
- Mean Citation Score: 359.6855720000001
- Max Citation Score: 392.17508
- Similarity Product: 299.98943311165334

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

Dataset: test