The dataset ranks 77 assignees across 475 records, with the leading assignee holding 84 records compared to 30 at fifth place and 14 at tenth. This steep drop-off means the field has one clearly dominant filer rather than a tight cluster of comparably sized competitors. The top 5 assignees combined hold 228 records, or 48.0% of all records in scope, and the top 10 hold 66.9%. Anyone assessing competitive risk in this space should look closely at the leader's portfolio first, since it accounts for a disproportionate share of claim coverage.

Complete-year data shows filings falling from 38 in 2021 to 15 in 2024, a 61% decline over that span, following a peak of 39 in 2019. This pattern is consistent with a maturing claim landscape where the core laminate and sealing-resin architectures are already well covered by existing patents. However, figures for 2025 and 2026 are still incomplete because publication typically lags actual filing by around 18 months, so the true recent trend cannot yet be read from the latest two years alone.

Layered products and laminates (IPC class B32B) appear in 72.6% of the 475 records in scope, making it by far the densest technology bucket, ahead of containers and packaging (B65D) at 36.8% and polymer compositions (C08L) at 19.2%. Because a single patent record can be classified under multiple IPC subclasses, these shares add up to more than 100% of the record total. The concentration in B32B indicates that most patent activity targets the multilayer film or membrane structure itself rather than the sterilization process or the container geometry.

US7798359B1, assigned to Berry Plastics Corporation and published in 2010, claims a heat-sealed, peelable lidding membrane built from a plastic layer laminated to a foil layer, with a co-extruded layer carrying its own heat-sealable sealing resin bonded on with a second adhesive. Any new lidding membrane that uses this same foil-plastic-adhesive-coextrusion stack for retort applications should be checked against its specific claim language before proceeding. It does not, by itself, block every peelable seal design — alternatives using different adhesive chemistries, non-foil barrier layers, or different lamination sequences may sit outside its claims, but that requires a specific claim-by-claim comparison.

The technology composition data shows heavy claim density on laminate structures (B32B, 72.6% of records) and containers (B65D, 36.8%), but comparatively thinner coverage on the sterilization validation side — areas like hydrogen peroxide sterilant exposure validation, lethality value process control, and package deformation detection. These branches appear in the search criteria but do not dominate the IPC composition, suggesting claims on the validation protocol and process-control side of sterilization are less crowded than claims on the film and container structures themselves. A first claim in these areas would need to tie a specific measurable parameter — such as a validated lethality threshold or a deformation detection method — to a defined packaging format.