Nippon Sheet Glass patented an optical filter with UV-IR-absorbing layer. The method involves preparing a composition with specific components, forming a film, and curing it under specific conditions. The filter has high transmittance in certain wavelengths and low transmittance in others, meeting specific criteria. GlobalData’s report on Nippon Sheet Glass gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Nippon Sheet Glass, Vacuum insulated glazing was a key innovation area identified from patents. Nippon Sheet Glass's grant share as of January 2024 was 32%. Grant share is based on the ratio of number of grants to total number of patents.

Uv-ir-absorbing optical filter manufacturing method

Source: United States Patent and Trademark Office (USPTO). Credit: Nippon Sheet Glass Co Ltd

A recently granted patent (Publication Number: US11885993B2) discloses a method for manufacturing an optical filter with a UV-IR-absorbing layer. The method involves preparing a UV-IR-absorbing composition containing a phosphonic acid and a copper component dispersed in a curable resin. This composition is then applied to form a film, which is cured into the UV-IR-absorbing layer by exposure to specific temperature and humidity conditions. The resulting optical filter exhibits specific spectral transmittance characteristics, including high average transmittance in the 450 nm to 600 nm wavelength range, low transmittance in the 750 nm to 1080 nm range, and a first IR cut-off wavelength between 620 nm to 680 nm.

Furthermore, the patent claims detail additional features of the optical filter, such as a maximum transmittance of 1% or less in the 300 nm to 350 nm wavelength range, increasing spectral transmittance in the 350 nm to 450 nm range, and specific cut-off wavelengths for UV and IR transmittance. The composition includes phosphonic acids with alkyl or phenyl groups, with variations in substitution patterns for the phenyl group. These specific components and manufacturing steps result in an optical filter with tailored transmittance properties suitable for various applications requiring UV and IR absorption capabilities.

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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.