Cool. How do you find that?
(PS. People reading comments directly from article can't see attached. Open comment thread in forum to see it:
https://www.canonrumors.com/forum/t...s-15-70mm-f-4-and-rf-s-15-85mm-f-2-8-4.42290/)
US Patent and patent applications can be browsed with the online tool provided by the USPTO (
https://ppubs.uspto.gov/pubwebapp/). It works with Chrome but it doesn't work with Safari. I don't know if it works with other browsers.
To search for all Canon patents and patent applications, type for example canon.aanm. in the input field on the upper left of the tool (the "." at the end is important). There might be better search terms if you are looking for lenses specifically, as the above will give you all patents filed by Canon. On the other hand, you also see filings about accessories, autofocus, IBIS, mechanical construction of camera bodies,... which can also be interesting. Patent applications are published on Thursdays.
The leftmost button above the viewer switches to a pdf-like view, the document can be saved with the print button next to it.
Note that the tool might block you if you browse through a large number of filings (at least it seems to do so in my case) by showing an "image not yet available" message. Usually after waiting a couple of minutes and reloading the tool you should be able to continue searching.
I wasn't aware that attachments are not displayed, is there a better way to upload them?