Tony's cloaking device makes his armor invisible to the naked eye:
======
Encases himself, and Captain America, in a protective force-field:
======
Tony's undersheath alone renders him bullet-proof:
======
Tony 'lays out' Mentallo via a psionic attack - he then erases the memory of his secret identity, from the villains mind:
Note that in the second scan, Tony develops a 'cyberprogram' which erases the memory of his identity from the minds of various villains [one of them being Molecule Man himself].