Seiko Epson Corp. sued Nu-Kote International, alleging that Nu-Kote had infringed on its design patent for ink cartridges for printers. The district court held that Seiko Epson’s design patent was invalid because:

(1) The cartridge is not visible after its installation and during use and thus its design was “not a matter of concern to consumers,” and

(2) The design is not aesthetically pleasing. Is the district court’s reasoning correct? What are the requirements for a valid design patent?