PATENT CLAIM ANALYSIS

Application Number: 15875156
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-08
Patent Classification: ["355", "053000"]

Abstract:
Target structures such as overlay gratings (Ta and Tb) are formed on a substrate (W) by a lithographic process. The first target is illuminated with a spot of first radiation ( 456 a , Sa) and simultaneously the second target is illuminated with a spot of second radiation ( 456 b , Sb). A sensor ( 418 ) detects at different locations, portions ( 460 x−,  460 x +) of said first radiation that have been diffracted in a first direction by features of the first target and portions ( 460 y−,  460 y +) of said second radiation that have been diffracted in a second direction by features of the second target. Asymmetry in X and Y directions can be detected simultaneously, reducing the time required for overlay measurements in X and Y. The two spots of radiation at soft x-ray wavelength can be generated simply by exciting two locations ( 710 a , 710 b ) in a higher harmonic generation (HHG) radiation source or inverse Compton scattering source.

Claim (Index 27):
An inspection apparatus comprising:\n an illumination system; and a detection system, wherein the illumination system includes a source arrangement configured to generate first radiation at a first source location in a radiation generation space and configured to simultaneously generate second radiation at a second source location in the same radiation generation space, the first radiation and the second radiation including wavelengths less than 100 nm, wherein an optical system of the illumination system is arranged to focus radiation from both the first source location and the second source location so as to illuminate a first target location with a spot of the first radiation while simultaneously illuminating a second target location with a spot of the second radiation, and wherein the detection system is arranged to detect, at one or more first detection locations, portions of the first radiation that have been diffracted in a first direction by a first target structure at the first target location and arranged to simultaneously detect, at one or more second detection locations, portions of the second radiation that have been diffracted in a second direction by features of a second target structure positioned at the second target location.

Metadata:
- Claim Count in Document: 1.0
- Percentile: 86.0
- Lexical Diversity: 2.11111
- Patent Class: 355.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14794013', '15435593', '15683216', '14838268', '15834763']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7061836511338385
- 35 USC 102 Novelty (BERT): 0.5232654169202117
- Combined Prediction Score: 0.6878918277124759
- Mean Citation Score: 343.0575340000001
- Max Citation Score: 365.839
- Similarity Product: 289.85392925655844

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

Dataset: test