https://catalog.data.gov/dataset/patent-at-e401434-t1-translated-polymer-filaments-with-profiled-cross-section
U.S. Department of Health & Human Services - Patent AT-E401434-T1: [Translated] POLYMER FILAMENTS...
The invention provides a profiled polymer filament having an open hollow cross-sectional shape normal to the longitudinal axis of the filament, wherein the...
department of health human