Thank you for these concise descriptions. I've read bits and pieces and would love to find out more. I have a short account of some of the "trouble" Mordan attracted around other peoples' patents in the middle of this article. https://thesteelpen.com/2017/11/13/pen-history-the-early-years-1830s-the-british-invasion/
In it I capture the accusation that Mordan stole Gowland's patent on a pen with reservoir. In this case, Mordan was defended by another famous inventor William Baddeley who was part of the negotiations between Mordan and Gowland.