PATENT CLAIM ANALYSIS

Application Number: 15925325
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-09
Patent Classification: ["356", "366000"]

Abstract:
A system for measuring overlay from a multi-layer overlay target for use in imaging based metrology is disclosed. The system is configured for measuring overlay from a multi-layer overly target that includes three or more target structures, wherein a first target structure is disposed in a first process layer, a second target structure is disposed in a second process layer, and at least a third target structure is disposed in at least a third process layer. The system includes an illumination source configured to illuminate the target structures of the multi-layer overlay target, a detector configured to collect light reflected from the target structures, and one or more processors configured to execute a set of program instructions to determine overlay error between two or more structures based on the collected light from the plurality of targets.

Claim (Index 1):
A system for measuring overlay from a multilayer overlay target comprising:\n an illumination source configured to illuminate a plurality of target structures disposed on one or more process layers of a semiconductor device, the plurality of target structures including three or more target structures, the three or more target structures including a first target structure, a second target structure and at least a third target structure, wherein at least some of the target structures include a set of two or more pattern elements, wherein the three or more target structures are configured to share a common center of symmetry upon alignment of the three or more target structures, wherein at least one of the target structures is invariant to 90 degree rotation about the common center of symmetry, wherein the first target structure is disposed in a first process layer, wherein the second target structure is disposed in a second process layer different from the first process layer, wherein at least the third target structure is disposed in at least a third process layer, the at least a third process layer different from the first process layer and the second process layer, wherein a first particular pattern element of the set of two or more pattern elements includes three or more sub-elements and at least a second particular pattern element of the set of two or more pattern elements includes three or more sub-elements, wherein at least one of the three or more sub-elements of the first particular pattern element or the three or more sub-elements of the at least the second particular pattern element comprise a set of three or more parallel line structures aligned along a selected direction and distributed along a direction orthogonal to the selected direction; a detector configured to collect light reflected from the plurality of target structures; and one or more processors configured to execute a set of program instructions maintained on a non-transitory memory medium, the set of program instructions configured to cause the one or more processors to determine overlay error between two or more structures based on the collected light from the plurality of targets.

Metadata:
- Claim Count in Document: 62.0
- Percentile: 90.0
- Lexical Diversity: 2.28571
- Patent Class: 356.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['13186144', '13783903', '13446133', '13964789', '12101439']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7449676232560309
- 35 USC 102 Novelty (BERT): 0.5392606339938667
- Combined Prediction Score: 0.7243969243298145
- Mean Citation Score: 283.869038
- Max Citation Score: 399.5543
- Similarity Product: 299.3013033999801

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