In this dataset the leading assignee holds 20 of the 59 records in scope, well ahead of the rest of the ranked field — fifth place holds only 3 records and tenth place just 1. That gap indicates a single company built a sustained filing programme around oxygen scavenger and barrier-coating claims rather than the field being evenly contested. Anyone doing freedom-to-operate work in this space should treat that leader’s portfolio as the first thing to check, not the last.

An oxygen scavenger is a material or additive built into or applied to a PET container that actively absorbs residual oxygen, extending shelf life for oxygen-sensitive contents like food and beverages. The representative filing in this dataset, US7238300B2, claims a process where the scavenger is dosed with actinic radiation and can be stored inactive until a second radiation dose triggers its scavenging activity. That two-stage activate-then-trigger approach is a recurring structural theme across the most-cited records in this space.

This landscape identifies 59 published records matching a search built around PET barrier coatings and oxygen scavenger technology, filtered further to documents addressing oxygen ingress rate, carbon dioxide retention, plasma coating, multilayer coinjection, recyclability impact or shelf-life extension. Filing activity peaked at 7 records in 2023 and has otherwise stayed low across the 2015-2026 window, which points to a narrow specialist niche rather than a heavily filed technology area. The 2026 figure is partial because publication typically lags filing by roughly 18 months.