International Paper. has filed a patent for paper substrates incorporating covert marking pigments (CMPs) like infrared (IR) anti-Stokes pigments. The process involves incorporating CMPs without printing, using techniques like size press or spraying. An IR pigment sensor can detect these pigments for adjusting printer pigment quantity or verifying document authenticity. GlobalData’s report on International Paper gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on International Paper, Fiber-reinforced material joining techniques was a key innovation area identified from patents. International Paper's grant share as of January 2024 was 72%. Grant share is based on the ratio of number of grants to total number of patents.

A recently filed patent (Publication Number: US20230399800A1) describes a covertly marked paper substrate article that includes a paper substrate with a covert marking pigment incorporated into it. The covert marking pigment, with a particle size ranging from 0.1 to 5 microns, is present in an infrared (IR) detectable amount of 0.1 to 1,000 mg/m2. The pigment consists of IR anti-Stokes shift pigments such as yttrium oxide, sodium yttrium fluoride, lanthanum oxide, and others. The covert marking pigment can be randomly distributed in the paper substrate, applied to one of the outer surfaces, or incorporated below the surfaces. Additionally, the patent covers a process for preparing the covertly marked paper substrate, involving incorporating the covert marking pigment into the paper substrate using a non-printing technique.

Furthermore, the patent details a process for adjusting the amount of printer pigment deposited on a covertly marked paper substrate sheet. This process includes scanning the paper substrate sheet with an IR pigment sensor to identify the type of covertly marked paper substrate sheet and adjusting the quantity of printer pigment accordingly. The covert marking pigment, with a particle size of 0.1 to 5 microns and an IR detectable amount of 0.1 to 1,000 mg/m2, aids in distinguishing authentic documents from counterfeits. By detecting the presence or absence of the specified covert marking pigment using an IR pigment sensor, the process can determine the authenticity of the paper substrate sheet. The patent emphasizes the use of specific IR anti-Stokes shift pigments like yttrium oxide, sodium yttrium fluoride, and others for this purpose.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.