PATENT CLAIM ANALYSIS

Application Number: 15743534
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-07
Patent Classification: ["216", "037000"]

Abstract:
Disclosed is a dry etching method for etching a laminated film of silicon oxide layers and silicon nitride layers on a substrate. The dry etching method includes providing a mask on the laminated film, generating a plasma from a dry etching agent and etching the laminated film by the plasma through the mask under a bias voltage of 500 V or higher to form a through hole in the laminated film vertically to the layers, wherein the dry etching agent contains at least C 3 H 2 F 4 , an unsaturated perfluorocarbon represented by C x F y  and an oxidizing gas, and wherein a volume of the unsaturated perfluorocarbon contained in the dry etching agent is 0.1 to 10 times a volume of the C 3 H 2 F 4  contained in the dry etching agent.

Claim (Index 11):
A dry etching method for etching a laminated film of silicon oxide layers and silicon nitride layers on a substrate, the dry etching method comprising providing a mask with a predetermined opening pattern on the laminated film, generating a plasma from a dry etching agent and etching the laminated film by the plasma through the mask under a bias voltage of 500 V or higher to form a through hole in the laminated film in a direction vertical to the silicon oxide layers and the silicon nitride layers,\n wherein the dry etching method includes: a first dry etching step during a former half of the formation of the through hole with the supply of a first dry etching agent containing C 3 H 2 F 4  and an oxidizing gas and substantially free of an unsaturated perfluorocarbon represented by C x F y  (where x is an integer of 2 to 5; y is 2, 4, 6, 8 or 10; and x and y satisfy y\u22642x), and\n a second dry etching step during a latter half of the formation of the through hole with the supply of a second dry etching agent containing C 3 H 2 F 4 , an unsaturated perfluorocarbon represented by C x F y  (where x is an integer of 2 to 5; y is 2, 4, 6, 8 or 10; and x and y satisfy y\u22642x) and an oxidizing gas, and \n wherein a volume of the unsaturated perfluorocarbon contained in the second dry etching agent is 0.1 to 10 times a volume of the C 3 H 2 F 4  contained in the second dry etching agent.

Metadata:
- Claim Count in Document: 13.0
- Percentile: 86.0
- Lexical Diversity: 2.2
- Patent Class: 216.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15003270', '13808506', '14841271', '15798476', '15560332']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7315558888509588
- 35 USC 102 Novelty (BERT): 0.5123930547923057
- Combined Prediction Score: 0.7096396054450935
- Mean Citation Score: 243.12406
- Max Citation Score: 311.71075
- Similarity Product: 266.48105646269033

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

Dataset: test