PATENT CLAIM ANALYSIS

Application Number: 15988018
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2019-01
Patent Classification: ["438", "270000"]

Abstract:
A manufacturing method of a trench power semiconductor device is provided. The manufacturing method includes the steps of forming a protective layer on an epitaxial layer and forming a trench gate structure in a trench formed in an epitaxial layer. The trench gate structure includes a shielding electrode, a gate disposed on the shielding electrode and an inter-electrode dielectric layer disposed therebetween. The step of forming the trench gate structure includes forming an insulating layer covering an inner surface of the trench; and before the step of forming the inter-electrode dielectric layer, forming an initial spacing layer, the spacing layer including a first sidewall portion and a second sidewall portion, both of which include bottom end portions spaced apart from each other and extending portions protruding from the protective layer.

Claim (Index 2):
The manufacturing method of a trench power semiconductor device according to  claim 1 , wherein the step of forming the trench gate structure includes:\n after the step of forming the initial spacing layer, forming an initial inner dielectric layer covering the initial spacing layer, wherein the bottom of the initial inner dielectric layer is directly in contact with the bottom of the insulating layer; forming a heavily-doped semiconductor material at the lower portion of the trench; removing the initial inner dielectric layer at the upper portion of the trench to form an inner dielectric layer at the low portion of the trench, wherein the inner dielectric layer surrounds the heavily-doped semiconductor material, and the top of the heavily-doped semiconductor material protrudes out of the inner dielectric layer; applying a thermal oxidation process to oxidize the top of the heavily-doped semiconductor material to form the inter-electrode dielectric layer and the shielding electrode; and forming the gate electrode at the upper portion of the trench.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 93.0
- Lexical Diversity: 2.27869
- Patent Class: 438.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15975023', '15090966', '15005130', '14994250', '15186685']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8757424288898623
- 35 USC 102 Novelty (BERT): 0.4937880222302868
- Combined Prediction Score: 0.8375469882239048
- Mean Citation Score: 232.767146
- Max Citation Score: 257.19028
- Similarity Product: 213.1166932129597

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

Dataset: test