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 20):
The method of  claim 16 , wherein the synthesized image is generated by a weighted combination of pixel values from the captured images, using a positive weight for at least one of the captured images and a negative weight for at least another one of the captured images.

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): 0.7174292372357236
- 35 USC 102 Novelty (BERT): 0.5149198750867995
- Combined Prediction Score: 0.6971783010208312
- Mean Citation Score: 307.672858
- Max Citation Score: 329.52704
- Similarity Product: 248.37333527740483

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