The assignee ranking in this dataset covers 60 companies, with the leading filer holding 64 records compared with 26 at fifth place and 8 at tenth place. That is a steep drop-off rather than an even spread, meaning one organisation has built a portfolio more than double the size of its closest mid-ranked competitors. The leaders are a mix of an integrated oil major, a national oil company and major oilfield service companies, several of which also appear together in co-assignee pairs, indicating joint development rather than purely independent portfolios.

No. The documented growth figure for this field is -100% from 2021 (3 filings) to 2024 (0 filings), with the historical peak at 9 filings in 2019. Filing activity has clearly cooled from its late-2010s high point, though because publication lags filing by roughly 18 months, the very latest years in any dataset always understate true activity, so 2025-2026 figures should not be read as confirmation of a continuing decline.

Records in this dataset split almost evenly between G01V (geophysics and gravity surveying) and G06F (electric digital data processing), each covering 47.5% of the 244 records, with E21B (earth and rock drilling) close behind at 35.7%. Because a single filing can carry several IPC classifications, these percentages add up to more than 100% of the record total. Newer computational approaches classified under G06N (AI-based computing) and G06T (image processing) cover only 3.3% and 2.0% of records respectively, marking them as comparatively open relative to the classical grid and solver clusters.