I finally got around to reading this; I can't recall where I found it. It looks like this isn't the actual patent but some sort of review of it that includes some or all of the patent. There's a surprising amount of typos and seemingly repeated information, and bureaucratically formatted. But here's my amateur translation:
The actual patent application was filed in 2021 and this review was written a couple years later in 2023 during some stage of the patent process. The founders of the company
PSILERA are behind this patent filing. They claimed to invent a way to synthesize DMT freebase, and make several different crystalline salts out of it.
At the very end of the PDF there's some commentary that there wasn't sufficient unity between these two halves of the "invention" because neither process explicitly required the other. And that the freebase synth wasn't new. And another comment that they failed to pay more money in time for the review to verify the novelty of the salt formations. I'm not confident I interpreted the language correctly though.
I searched for the provisional patent # but couldn't find any results. I think the company abandoned this patent effort.
It has some cool information on fumarate, tartrate, maleate, and succinate salts in crystal form, as well as some drawings of the molecules and crystal structures.
Interestingly, for the fumarate salt, they produced different powder XRD data than a
previous study. Could be polymorphic or differences between the ratios of dmt and fumarate.