In this dataset, Corning Incorporated (Corning) stands out for its co-assignment activity, appearing in the strongest partnered filing pairs alongside Samsung Corning Precision Materials Co., Ltd. and individual co-inventors. Other named active assignees include Essilor International, Nikon Corporation (Nikon), Raytheon Company (Raytheon) and Gentex Corporation (Gentex), spanning glass, ophthalmic, defence-optics and automotive-mirror applications. The ranking itself covers all 972 families in the corpus, and the pattern is a small named cluster sitting above a much longer tail of low-volume filers, so no single company holds a dominant share.

No — filing volume peaked at 55 in 2020 and has declined since, falling through 26 at the 2022 midpoint down to a single record in the most recent, still-partial year. Some of that recent drop is publication lag, since filings typically take about eighteen months to appear in the record. Even accounting for that lag, the multi-year downward trend from the 2020 peak indicates the field has moved past its most active filing period rather than into renewed growth.

G02B (optical elements & systems) is by far the largest classification, present in 908 of the 972 records, meaning the great majority of filings are framed as optical-element or coating-design claims. C23C (coating & surface deposition) and C03C (glass & enamel compositions) are the next largest at 210 and 186 respectively, reflecting the process and materials side of the same coatings. Smaller but present categories include B32B laminates, G02C spectacle lenses, B05D coating processes, G02F optical modulation and G09F signage, showing the coatings find use across a fairly wide set of end applications.