U.S. Patent and Trademark Office
Dental floss insertion device. Inventor: Thomas F. Jackson. Filed May 27, 2019, granted May 17, 2022. Status: active.
From the patent’s abstract: “A dental floss insertion device for inserting an end of a length of dental floss into an enclosed oral space.”
The same invention is granted in Europe as EP 3 698 753 (August 9, 2023). The floss packaging has its own U.S. patent, 11,678,961 (June 20, 2023).
To check it yourself, search 11,331,175 on Google Patents or at uspto.gov.