04713808 is referenced by 272 patents and cites 18 patents.

A wide area paging system is disclosed in which paging messages input to the system in one local area can be broadcast to a receiver in any other local area without necessarily broadcasting the message in all areas. A local area clearinghouse in each area stores resident subscriber data including current location and receiver serial number. This data is used to transfer messages over a data network to the correct clearinghouse. The system uses a TDM data protocol. The data is encoded and transmitted at a very high rate (e.g., 19,000 baud) in short packets (256 bits/13 milliseconds) via stereo FM sidebands. Receivers are assigned to receive sequentially numbered time slots matching a portion of their address. The addresses of intended receivers are included in the data packets. Battery-powered receivers are deactivated between packets and reactivated in accordance with the sequential time slot number scheme to receive an incoming packet. Messages longer than a packet are segmented and transmitted in two or more packets, linked together by data contained in the packets. A watch pager used in the system employs a wristband antenna which electromagnetically couples to the user's body. The watch pager displays time, telephone numbers and icons representing common types of paging messages.

Title
Watch pager system and communication protocol
Application Number
6/802844
Publication Number
4713808
Application Date
November 27, 1985
Publication Date
December 15, 1987
Inventor
Don G Hoff
Tiburon
CA, US
Lewis W Barnum
Tigard
OR, US
Joseph F Stiley III
Tigard
OR, US
Donald T Rose
Portland
OR, US
Robert G Rullman
Beaverton
OR, US
Daniel J Park
Beaverton
OR, US
Garold B Gaskill
Portland
OR, US
Agent
Klarquist Sparkman Campbell Leigh & Whinston
Assignee
A T & E Corporation
CA, US
IPC
H04J 3/26
H04J 3/24
View Original Source