PATENT CLAIM ANALYSIS

Application Number: 15755098
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-08
Patent Classification: ["257", "077000"]

Abstract:
An active cell region, an edge termination region surrounding the active cell region and an intermediate region located at an intermediate position between these regions are provided, the active cell region has a trench gate type MOS structure on a top side, and a vertical structure on a bottom side includes a p-collector layer, an n-buffer layer on the p-collector layer, and an n-drift layer on the n-buffer layer, the n-buffer layer has a first buffer portion provided on the p-collector layer side, and a second buffer portion provided on the n-drift layer side, the peak impurity concentration of the first buffer portion is higher than the peak impurity concentration of the second buffer portion, and the impurity concentration gradient on the n-drift layer side of the second buffer portion is gentler than the impurity concentration gradient on the n-drift layer side of the first buffer portion.

Claim (Index 9):
A semiconductor device comprising:\n an active cell region; an edge termination region surrounding the active cell region; and an intermediate region located at an intermediate position between the active cell region and the edge termination region, wherein the active cell region has a trench gate type MOS structure on a top side thereof, and has a p-collector layer, an n-buffer layer on the p-collector layer and an n-drift layer on the n-buffer layer as a vertical structure on a bottom side thereof, and the n-buffer layer has buffer portions of three or more layers that are different in peak impurity concentration and distance from a back surface of the n-buffer layer, and wherein the peak impurity concentration of a first buffer portion that is a buffer portion nearest to the p-collector layer is highest among a plurality of the buffer portions, and comparing impurity concentration gradients on the n-drift layer side of the plurality of buffer portions, the impurity concentration gradient of a buffer potion nearest to the n-drift layer is gentlest.

Metadata:
- Claim Count in Document: 53.0
- Percentile: 88.0
- Lexical Diversity: 3.07843
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['14678797', '15533615', '14111168', '14784170', '13994424']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9107686245214488
- 35 USC 102 Novelty (BERT): 0.5156655455387913
- Combined Prediction Score: 0.8712583166231832
- Mean Citation Score: 287.140746
- Max Citation Score: 302.5694
- Similarity Product: 242.2511803488016

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