The two dominant chemistries tracked in this landscape are polyamidoamine epichlorohydrin (PAE) resins and glyoxalated polyacrylamide (GPAM) systems. PAE resins are the longer-established route and deliver permanent-type wet strength, while GPAM systems are more commonly associated with temporary wet strength that decays after wetting, which matters for flushability and repulpability requirements. Both routes appear heavily in the D21H pulp and paper composition subclass, which covers 74.4% of the 4,984 records in this scope, and the choice between them in a given filing usually tracks whether the end product needs permanent or temporary strength.

Filing in this space is highly concentrated: the top five assignees account for 3,604 of the 4,984 records in scope, or 72.3%, and the top ten account for 83.1%. The single leading assignee holds 1,694 records, roughly ten times the tenth-place total of 87. Recent-year momentum data shows most of these leaders filing far less than their historic pace, with the top assignee down 81% year-on-year in the latest tracked year, so leadership by cumulative volume does not necessarily mean leadership in current filing activity.

Filing peaked at 245 records in 2017 and the cleanest available comparison, 2021's 73 filings against 2024's 58, shows a 21% decline over that three-year span. This is consistent with a mature, consolidated field where the largest players already hold dense claim positions and have less need to keep filing at peak rates. It is important not to over-read the very latest years: publication typically lags filing by around 18 months, so 2025 and 2026 figures in any dataset will understate true activity and should not be treated as confirming a continuing drop.

US9879382B2, assigned to GPCP IP Holdings LLC and published in January 2018, claims a multi-ply bath tissue that uses temporary wet strength resin dosed to hit a specific Finch Cup cross-machine wet tensile range that decays to less than 65% of its initial value within 15 minutes of wetting, combined with a defined caliper per basis weight and a particular hollow-domed ply structure. Anyone designing a temporary-wet-strength tissue product with similar decay kinetics and ply geometry should review this claim's specific numeric ranges closely, since the patent is structured around those thresholds rather than the resin chemistry alone. Products that use a different decay profile, caliper range, or ply structure sit outside the literal claim scope, but a design-around still needs a full claim chart rather than a read of the abstract.

The technology composition data shows claim density is heavily weighted toward D21H pulp and paper compositions (74.4% of records), with much lower activity in adjacent branches like implant and absorbent-laminate crossover applications (A61F, 7.4%) and layered laminate structures (B32B, 6.4%). Sub-areas tied to specific process concerns in the search scope, such as AOX-reduction cure chemistry and repulpability-triggered resin breakdown, show meaningful activity without anything like D21H's filing density. That gap suggests narrower, mechanism-specific claims in those branches have more room than a broad formulation claim would in the core pulp and paper composition space.