Optical Brightening Agents for Paper: Patents, Leading Filers and Where the Claim Space Is Still Open
Concentrated but not locked up. the top 5 assignees hold 35.7% of all 1,565 records in scope, and the top 10 hold 50.2% — leaving roughly half the field to a long tail of single- and few-filing entrants. Filings ran at 21 in 2017 and reached a peak of 40 in 2018. The only growth figure that can be stated with confidence is the 2021-to-2024 span, where volume fell from 20 to 9 records, a -55% change. Years after 2024 are still incomplete in the record and are excluded from that comparison.
- 1INT PAPER CO127
- 2BLANKOPHOR GMBH117
- 3ARCHROMA IP GMBH113
- 4PROCTER & GAMBLE CO102
- 5CLARIANT FIANCE (BVI) LTD100
See the full optical brightening agents for paper analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about optical brightening agent patents
Who are the leading patent holders for optical brightening agents in paper?
The dataset ranks 100 companies by filing volume, with the leading assignee holding 127 records and the field showing clear concentration at the top: the top 5 assignees together account for 35.7% of all 1,565 records in scope, and the top 10 account for 50.2%. That still leaves roughly half of all filings spread across a long tail of smaller and single-filing entrants, so the field is concentrated but not closed. Paper manufacturers and specialty chemical companies dominate the upper ranks, with consumer goods firms appearing where brightener chemistry crosses into detergents and cosmetics.
Is the patent activity for optical brightening agents growing or declining?
Filing peaked at 40 records in 2018, and the most recent complete comparison available, 2021 to 2024, shows a -55% decline from 20 to 9 records. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so it would be premature to call this a permanent slowdown rather than a reporting gap. Anyone tracking this space should revisit the trend once the most recent two years of data have had time to populate.
What does US8808842B2 actually cover?
US8808842B2 claims a coated white sheet with fluorescence intensity above 55 as measured under ISO 11475:2004, comparing CIE whiteness under a D65 illuminant with and without a 420 nm cutoff filter, that is also offset-printable without mottling. The coating combines white pigments, a coating binder, and a fluorescent whitening agent at 1% dry weight or more. It is narrowly drawn around the combination of a specific whiteness measurement threshold and printability performance, rather than the brightener chemistry itself, which limits how broadly it can block adjacent formulations.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Optical Brightening Agents for Paper covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.