US Patent Issued on Sept. 15 for "Narrowband absorbing and reflecting optical filters" (California Inventor)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,736,727, issued on Sept. 15.

"Narrowband absorbing and reflecting optical filters" was invented by William H Southwell (Thousand Oaks, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "This invention consists of two new types of narrowband optical interference filters that expand the current state-of-the-art narrowband filtering. Prior narrowband filters have a high transmission for a narrow wavelength band reflect light from surrounding wavelengths. The filters of this invention allow for narrowband absorption and narrowband reflection. These new filters include a thin absorbing layer with the standard dielectric layers."

The patent was filed on ...