PATENT CLAIM ANALYSIS

Application Number: 16169796
Application Type: Utility
Filing Date: 2018-10
Publication Date: 2019-03
Patent Classification: ["257", "774000"]

Abstract:
For simplifying the dual-damascene formation steps of a multilevel Cu interconnect, a formation step of an antireflective film below a photoresist film is omitted. Described specifically, an interlayer insulating film is dry etched with a photoresist film formed thereover as a mask, and interconnect trenches are formed by terminating etching at the surface of a stopper film formed in the interlayer insulating film. The stopper film is made of an SiCN film having a low optical reflectance, thereby causing it to serve as an antireflective film when the photoresist film is exposed.

Claim (Index 14):
A semiconductor integrated circuit device, comprising:\n (a) a first-level interconnect formed over the main surface of a semiconductor substrate; (b) a first interlayer insulating film formed over the first-level interconnect; (c) a first via hole formed in the first interlayer insulating film and connected to the first-level interconnect; (d) a first interconnect trench formed in the first interlayer insulating film in a region including a region in which the first via hole has been formed; (e) a second-level interconnect formed by filling a metal film in the first interconnect trench and first via hole; (f) a second interlayer insulating film formed over the second-level interconnect; (g) a second via hole formed in the second interlayer insulating film and connected to the second-level interconnect; (h) a second interconnect trench formed in the second interlayer insulating film in a region including a region in which the second via hole has been formed; and (i) a third-level interconnect formed by filling a metal film in the second interconnect trench and second via hole, wherein the second interlayer insulating film is thicker than the first interlayer insulating film and a first etching stopper film is formed in the second interlayer insulating film.

Metadata:
- Claim Count in Document: 26.0
- Percentile: 97.0
- Lexical Diversity: 1.76786
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['11453882', '12141195', '13081332', '13525195', '12141172']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.9352380105947126
- 35 USC 102 Novelty (BERT): 0.5990375317373815
- Combined Prediction Score: 0.9016179627089796
- Mean Citation Score: 486.80999
- Max Citation Score: 509.54678
- Similarity Product: 481.49810491274354

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