PATENT CLAIM ANALYSIS

Application Number: 15994343
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-10
Patent Classification: ["438", "531000"]

Abstract:
A step of forming a silicon carbide substrate includes steps of: forming a first impurity region having a first conductivity type by epitaxial growth; forming an embedded region by performing ion implantation into the first impurity region, the embedded region having a second conductivity type different from the first conductivity type, the embedded region being disposed cyclically; and forming a second impurity region by epitaxial growth, the second impurity region being in contact with the first impurity region and the embedded region, the second impurity region having the second conductivity type, the second impurity region having an impurity concentration lower than an impurity concentration of the embedded region. A trench is formed to have a side portion and a bottom portion. The trench is disposed at the same cycle as the embedded region.

Claim (Index 1):
A method for manufacturing a silicon carbide semiconductor device, the method comprising steps of:\n forming a silicon carbide substrate having a first main surface and a second main surface opposite to the first main surface, the step of forming the silicon carbide substrate includes steps of\n forming a first impurity region having a first conductivity type by epitaxial growth, \n forming an embedded region by performing ion implantation into the first impurity region, the embedded region having a second conductivity type different from the first conductivity type, the embedded region being disposed cyclically, \n forming a second impurity region by epitaxial growth, the second impurity region being in contact with the first impurity region and the embedded region, the second impurity region having the second conductivity type, the second impurity region having an impurity concentration lower than an impurity concentration of the embedded region, and \n forming a third impurity region having the first conductivity type, the third impurity region being separated from the first impurity region by the second impurity region; \n forming a trench having a side portion and a bottom portion, the side portion extending to the first impurity region through the second impurity region and the third impurity region, the bottom portion being continuous to the side portion, the trench being disposed at the same cycle as the embedded region; and forming a gate insulating film in contact with the first impurity region, the second impurity region, and the third impurity region at the side portion of the trench; wherein the first impurity region includes a first region, a second region and a third region, the first region is in contact with the second impurity region, the second region is in contact with the first region, the third region is in contact with the second region, the second region is between the first region and the third region, an impurity concentration of the second region is higher than an impurity concentration of the first region, and an impurity concentration of the third region is lower than an impurity concentration of the second region.

Metadata:
- Claim Count in Document: 5.0
- Percentile: 93.0
- Lexical Diversity: 2.57143
- Patent Class: 438.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14831580', '14917551', '15322860', '14651985', '13921674']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8870509052525797
- 35 USC 102 Novelty (BERT): 0.5254328853608249
- Combined Prediction Score: 0.8508891032634042
- Mean Citation Score: 351.186514
- Max Citation Score: 354.08755
- Similarity Product: 296.25579574274417

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