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 8):
A method for producing an epitaxial silicon carbide single crystal wafer, the method comprising:\n supplying a silicon-based material gas and a carbon-based material gas to an inside of an epitaxial growth reactor and epitaxially growing silicon carbide on a silicon carbide single crystal substrate using a thermal CVD method to produce an epitaxial silicon carbide single crystal wafer, wherein the method comprises, before starting epitaxial growth, supplying an etching gas inside the epitaxial growth reactor to etch the surface of the silicon carbide single crystal substrate by 500 nm to 1000 nm so that the arithmetic average roughness Ra value becomes 0.5 nm to 3.0 nm and to form step bunching starting from the basal plane dislocations on the surface of said silicon carbide single crystal substrate.

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): 0.8106070077743953
- 35 USC 102 Novelty (BERT): 0.5387930357902642
- Combined Prediction Score: 0.7834256105759821
- Mean Citation Score: 359.6855720000001
- Max Citation Score: 392.17508
- Similarity Product: 309.82416547924754

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