Really? You cannot patent a tube? Tell that to the oil industry and the hold Hughes Tool had for over a half a century on the industry. Just a tube used by the thousands to drill for oil and the only ones that could be used on the Hughes drill head were patented by Hughes. Or how about the patented tubes used in BMW fuel systems, the list is endless. Its called a Utility Patent, Issued for the invention of a new and useful process, machine, manufacture, or composition of matter, or a new and useful improvement thereof, it generally permits its owner to exclude others from making, using, or selling the invention for a period of up to twenty years from the date of patent application filing ++, subject to the payment of maintenance fees. Approximately 90% of the patent documents issued by the USPTO in recent years have been utility patents, also referred to as "patents for invention". If you are gong to mke statements of fact, make sure they are correct.