Support BladeForums! Paid memberships don't see ads! Nearly all patents are "improvement" patents. Moon can't just re-patent the Axis Lock (obviously), but he certainly could patent a design that starts with an Axis lock and changes it in ways that are "new" and "non-obvious" (those are terms of art in patent law and have specific meanings). It's entirely possible that he could patent his improved version of the Axis lock.