Radio paging device including apparatus for preventing undesired device turn-off

Claim 1

A radio paging device comprising: receiving means, for receiving radio frequency selective calling message signals transmitted over a communications channel; decoding means, coupled to said receiving means, for detecting when selective calling message signals intended for said device are received; memory means, coupled to said decoding means, for storing said selective calling message signals; interrogation means, coupled to said memory means, for interrogating said memory means upon command of the user of said paging device to provide output of the selective calling messages signals stored in said memory means in a form understandable to the user; power supply means, for providing power to said radio paging device; user actuable switching means, operatively coupled to said power supply means, for selectively switching power to said paging device; memory checking means, coupled to said memory means and said switching means, for determining if any unread selective calling message signals remain in said memory means when the user attempts to turn off the device, and turn off prevention means, coupled to said memory checking means and said switching means, for preventing turn off of said device if said memory checking means determines that unread selective calling message signals remain in said memory means when the user attempts to turn off the device.