Patent ID: 8757519

Claim:
A mobile device for spreading, over terrain or other surface, granular product applications contained in a cartridge, the mobile device comprising: a granular product launcher; a cartridge station comprising: at least one cartridge engager that is configured to engage with a cartridge comprising a cartridge fitment through matching of mechanical design features on the cartridge station with mechanical features on the cartridge fitment, wherein the cartridge is removable from the at least one cartridge engager and the cartridge comprises a container, functionally joined to the cartridge fitment, for holding the granular product; and the at least one cartridge engager comprising: a locking mechanism configured to stabilize the cartridge after engagement with the cartridge station through engagement with complementary locking structures on the cartridge fitment when in a first position, the locking mechanism being further configured to release the cartridge in a second position; and a cartridge activator, configured to activate and deactivate the flow of granular product out of a cartridge; and an activation controller configured to control the cartridge activator and thereby control the activation and deactivation of an engaged cartridge.