Dang, I'd totally forgotten that design! One of my early patents, back in my early 20s...
I don't know of any Houghtons in my ancestry from Canada, but I don't have a solid grasp on the genealogy/geography of that part of the family line. I know one of the "married in" names had a farm in upstate New York, but that's about as close as I can get.
I note there's a museum and historical society in the (small) town:
https://theparismuseum.com/. Maybe there's someone there with a passion for mechanical history; or, if you're not attached to it, they might be thrilled to have it for their collection.
As to royalties, unless we can come up with a clear ancestry, I'll split them with Don.