ALEXANDRIA, Va., June 5 -- United States Patent no. 12,274,968, issued on April 15, was assigned to Hollingsworth & Vose Co. (East Walpole, Mass.).

"Filter media comprising a pre-filter layer" was invented by Sudhakar Jaganathan (Northborough, Mass.), Nagendra Anantharamaiah (Acton, Mass.) and Maxim Silin (Hudson, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Filter media comprising a pre-filter layer and related components, systems, and methods associated therewith are provided. In some embodiments, the pre-filter layer may be designed to impart desirable properties to the filter media, such as a high gamma and/or long service life, while having relatively minimal or no adverse effects on another pro...