2021.03.01 16:29 "[Tiff] TIFF and multispectral images of historical documents?", by Andreas Romeyke

2021.03.03 05:48 "Re: [Tiff] [Off Topic] TIFF trademark", by William Bader

USPTO web pages mention TIFF without (R) or (TM). Is that an indication that TIFF is not a trademark in the US?

https://developer.uspto.gov/product/patent-application-single-page-tiff-images

https://developer.uspto.gov/product/trademark-registration-multi-page-tiff-images-discontinued

https://www.uspto.gov/sites/default/files/products/24hrbox-documentation-2013.pdf

USPTO has a presentation on submarine trademarks https://www.uspto.gov/sites/default/files/documents/IPSDM17_3.2_Fink_Myers_ppt.pdf