If there is a pat on the lens mount it would be meaningless unless you were in the business of manufacturing lens mounts from scratch to mimic a leica. Since you already own the lens in essence you are only making modifications to your own equipment.
Jorge,
I really like RFf and I'd hate to see it go away. I'm not a patent lawyer but I think you really need to be careful here, if there is a patent. I did a quick US patent search and didn't find one, but like I said before, if they patented the eyepiece magnifier, I can't believe that they wouldn't or couldn't do it with this.
You are right; if you take your Dremel tool and some Testor's model paint and Franken-dot your mount, no one is the wiser. You try to compete with Leica on this, or screw up some Leica marketing execs plan to sell more lenses, I can't imagine they will sit by. Call it over-reaction, call it lawyer phobia, but I end up being a Cassandra far more than I want to.
I saw on pnet that you have a buddy who is going to see some Leica people. I'd have him enquire about the technology and any IP behind it.
Maybe Stephen Gandy can get Mr. K to comment on Cosina's plans for Voightlander M mount lenses and if there are any IP issues.
Best Regards,
Mark