Installing Patent Free Epson Compatible Ink CartridgesOne of our biggest customer queries is "how do I install my replacement Epson cartridges, they don't look right?". Our compatible ink cartridges for Epson printers are 'patent free' in order to comply with Epson patents, which means their physical dimensions and chip design might differ to OEM Genuine Epson cartridges and some other compatible cartridges that don't comply with those guidelines.