I'm looking for this as part of the larger research project on the history of the US steel pen trade. (at the risk of repeating myself, check out my blog https://thesteelpen.com/ where I'm posting some of this) I only recently ran across a mention of Goodyear rubber pens, then found the ads, then found that he had filed a patent in the UK. Charles Goodyear had a bunch of patent problems in the UK and I've not found any other mention of the pen patents I found in the UK files, either there or here. Unfortunately, I can't get access to the UK patent details, and I can't seem to find if there was a corresponding patent in the US for writing instruments. It could be that the India Rubber Pen Company (which I also cannot find any information about) was very short lived and only licensed the rubber from Goodyear, he had nothing else to do with it, but then, if that was the case, why file a patent in the UK for pens and writing instruments?
My understanding is that Charles never actually had anything to do with the name that bares his name. The company history may or may not have any information on this early period. But, hey. If you're willing, I would be very curious to know. I have another British patent relating to writing instruments for Charles, and one from his son Charles Jr.
They're on my other computer. I'll pull those out and post them here. If you get a chance, that would be fantastic. But I know that can be a lot of trouble, so if it doesn't happen, don't worry about it.