07983628 is referenced by 57 patents and cites 132 patents.

The handheld personal electronic device has a first body having a display, a second body having a plurality of manual inputs, the second body capable of attachment to the first body, the personal electronic device having an open position wherein the display of the first body and the manual inputs of the second body are accessibly exposed. And, the personal electronic device having a closed position wherein the display of the first body is protected by the second body and the manual inputs of the second body are accessibly exposed.

Title
Cellular telephone and personal digital assistant
Application Number
10/939940
Publication Number
7983628 (B2)
Application Date
September 13, 2004
Publication Date
July 19, 2011
Inventor
Peter V Boesen
Des Moines
IA, US
Agent
Clifford Kraft
IPC
H04B 1/38
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