A major challenge faced by printer developers with regards to this typeof printers was the fact that the flow of printer ink from the print head to thepage needed to be controlled. This required cutting edge technologicalresearch not only in terms of the printers but also the printercartridges. Initially the dried printer ink clogged the printer head, and eventhe IBM strategy to use electrically charged droplets for coating thepages with ink was not successful and lacked consumer appeal. Thischallenge was tackled by two companies namely Hewlett-Packard and Canon.They introduced the inkjet printer in the market that used liquid ink,held in cartridges. These became vastly popular and this technology isstill in use today.