Apparently trademark renewals are required every 10 years, so... either this was registered to correct a possible typo or error in the original application or ?? seems to be overkill to me, but what do I know... I've passed on three Millionaire makers in the last 5-6 years, opting to hold my position here! If our filter were a pill instead of a device, we would all be wealthy right now. Something is in the air, let's hope it's not a disappointment...