PATENT CLAIM ANALYSIS

Application Number: 16007112
Application Type: Utility
Filing Date: 2018-06
Publication Date: 2018-12
Patent Classification: ["355", "067000"]

Abstract:
Overlay error of a lithographic process is measured using a plurality of target structures, each target structure having a known overlay bias. A detection system captures a plurality of images ( 740 ) representing selected portions of radiation diffracted by the target structures under a plurality of different capture conditions (λ 1, λ2 ). Pixel values of the captured images are combined ( 748 ) to obtain one or more synthesized images ( 750 ). A plurality of synthesized diffraction signals are extracted ( 744 ) from the synthesized image or images, and used to calculate a measurement of overlay. The computational burden is reduced compared with extracting diffraction signals from the captured images individually. The captured images may be dark-field images or pupil images, obtained using a scatterometer.

Claim (Index 21):
The method of  claim 16 , wherein the using the synthesized diffraction signals includes obtaining asymmetry values for two or more target structures by combining two or more of the synthesized diffraction signals extracted in the extracting.

Metadata:
- Claim Count in Document: 2.0
- Percentile: 94.0
- Lexical Diversity: 1.77215
- Patent Class: 355.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['15967861', '15834763', '14838268', '14794013', '15435593']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7174667192084638
- 35 USC 102 Novelty (BERT): 0.5131549774555204
- Combined Prediction Score: 0.6970355450331694
- Mean Citation Score: 307.672858
- Max Citation Score: 329.52704
- Similarity Product: 266.04946295036314

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

Dataset: test