You need to read things , but I could have given all the Patent No's use the search feature in Adobe Acrobat: Try another US 3765892 this is the one I cut & pasted from. I'm skipping between Patents rather fast looking at it's uses, and the Fuji Patents are interlinked through citations etc.
2nd line states . . . . . . sodium benzenene-sulfonate, ascorbic acid, diethylhydroxylamine, etc are used as antioxidants. Page 3 of the Patent bottom of Column 3.
The fact that Fuji refer to it in at least 4 Patents, and that many other companies/patents refer to it as an antioxidant is rather conclusive that it can be used as such.
I was more interested in finding a link to it's use by Agfa, I've save some of the other Patents for later reading but didn't think they were of that much interest.