[mitthrowaway2]

Well, patents are only supposed to be granted if an idea is non-obvious to someone skilled in the field. Replacing an illegal propellant with a legal one should be obvious to anyone in the field, so this patent deserves to be challenged.

[redeeman]

and while we're at it, maybe punish the ones who granted it? perhaps even make the people who did it, and anyone who knew of it, and didnt try combat it PERSONALLY liable for it?