IP Verse

Pigment Powders

Patent No. EP3378900 (titled "Pigment Powders") was filed by Merck Patent on Mar 19, 2018. The application was issued on Mar 5, 2025.

Patent Summary

A pigment powder comprises coated BiOCl flakes (particle size <25 µm, thickness ≤100 nm) selected from four variants: a) 70-92 wt% BiOCl and 8-30 wt% yellow iron oxide ($\text{Fe}_2\text{O}_3 \cdot x\text{H}_2\text{O}$), optionally with a colorant, adjuvant, and $\text{SiO}_2$; b) 90-95 wt% BiOCl and 5-10 wt% $\text{SiO}_2$, optionally with a colorant and adjuvant; c) 57-90 wt% BiOCl, 0.01-3 wt% yellow iron oxide, 3-20 wt% colorant, 4-15 wt% $\text{SiO}_2$, and 0.01-5 wt% adjuvant; or d) 75-95 wt% BiOCl, 5-20 wt% $\text{Fe}_3\text{O}_4$, and 0-5 wt% $\text{SiO}_2$. The adjuvant consists of nonionic surfactant molecules comprising fatty alkyl

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Patent Oppositions (2)

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.

CompanyOpposition DateRepresentative
BASF COLORS & EFFECTS GMBHApr 14, 2021ALTMANN STEL DICK
SUN CHEMICAL COLORS & EFFECTSApr 14, 2021HERZOG

Dossier Documents

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  • Date

    Description

EP3378900

MERCK PATENT
Application Number
EP18162491A
Filing Date
Mar 19, 2018
Status
Patent Maintained As Amended
Jan 31, 2025
Publication Date
Mar 5, 2025
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