It covers inspection techniques applied to a sealed integrated circuit or component package without opening or destroying it, chiefly scanning acoustic microscopy, X-ray tomography and acoustic micro imaging. In this dataset the search pairs those modalities with specific defect or interpretation problems: delamination detection, voids in solder, wire sweep, resolution limits, sample orientation and artifact interpretation. That combination is what separates this landscape from general X-ray or acoustic imaging patents that are not tied to package-level defect analysis.

The ranking covers 92 assignees drawn from the 320 records in scope, with the single leading assignee holding 89 records and the top five combined holding 163 records, or 50.9% of the total. Several of the top holders are related entities that co-file together, which concentrates the leading position within one corporate cluster rather than spreading it across independent competitors. Beyond the top ten, which together hold 66.9% of records, the remaining assignees each hold a small number of filings.

Filing counts peaked at 18 in 2017 and have since settled lower, with complete-year data showing 6 filings in both 2021 and 2024 — a 0% change across that span. That reads as flat rather than declining. The most recent one to two years in any such trend are always understated because publication typically lags actual filing by roughly 18 months, so it is too early to call the 2025-2026 dip a real slowdown.

Start with G01N, material analysis and testing, which covers 67.5% of the 320 records in scope and anchors the core inspection-technique claims. Then check A61B (22.5%) and B01L (16.6%), since a meaningful share of records also carry diagnostic or lab-apparatus classifications, which suggests claim language sometimes crosses from pure package inspection into diagnostic or lab-on-chip apparatus. Smaller classes like G01T, C12Q, C12M, H01J and G06F are worth a secondary pass rather than a first-pass search.

The concentration data shows half of all records held by five related assignees, but the specific defect-detection sub-areas — wire sweep detection thresholds, sample-orientation correction, and artifact interpretation methods for acoustic micro imaging — carry noticeably thinner coverage than the core material-analysis claims. That gap suggests room for narrowly scoped claims tied to a specific defect signature or correction algorithm rather than a broad imaging-modality claim, which is far more likely to run into the dense prior art held by the leading cluster.