I'm working on a rewrite of a patented web application. When the application was patented couple of years ago, the original developer made some rather aged user interface choices (such as the style of navigation hails back from the early 2000's). The patent outlines the process flow of the application (includes flow charts, etc.), and then it has a crude wireframe-style (i.e. patent application style) representation of some of the application screens. These screens include the legacy navigation. The product owner is concerned that should the navigation be modernized, the patent would potentially be invalidated because the app screen would no longer be exactly like it appears on the patent printout.
However, the updated new menu I'm proposing has the same menu choices; their location just changes some. This is even more of an issue on the mobile side as the legacy style menu won't properly fit there, and it would also violate the typical user experience expectations in the mobile environments.
So my question is, can these cosmetic user interface changes be made while keeping the patent intact? The proposed changes won't in any way affect the operation or the process flow described in the patent.
Thank you for any advice and/or insights on this issue!