PATENT CLAIM ANALYSIS

Application Number: 16029391
Application Type: Utility
Filing Date: 2018-07
Publication Date: 2019-04
Patent Classification: ["355", "055000"]

Abstract:
A method of evaluating a focus control of an extreme ultraviolet (EUV) lithography apparatus includes preparing a wafer exposed by using the EUV lithography apparatus. The wafer includes test patterns formed of a photoresist and having circular islands or holes prepared by multiple exposures of EUV at different foci of exposure. The method further includes measuring a roughness parameter of the test patterns and estimating a function representing a dependence of the roughness parameter on the focus. A best focus is estimated based on an extremum of the function. Exposure wafers are then exposed to EUV with the best focus. The exposure wafers include the test patterns. The roughness parameter for the test patterns on the exposure wafers obtained by exposing the exposure wafers at the best focus is periodically measured. An abnormality in focus is then determined based on the measured roughness parameter and the function.

Claim (Index 14):
The method of  claim 8 , wherein the acceptable roughness parameter range is from 0.05 nm to 5 nm.

Metadata:
- Claim Count in Document: 12.0
- Percentile: 95.0
- Lexical Diversity: 2.21127
- Patent Class: 355.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: False
- Related Applications: ['15182160', '14620803', '15820478', '14717890', '14705736']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7139270011076013
- 35 USC 102 Novelty (BERT): 0.4992169905274857
- Combined Prediction Score: 0.6924560000495897
- Mean Citation Score: 204.113444
- Max Citation Score: 219.42856
- Similarity Product: 120.36527606216907

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

Dataset: test