LL White - US Patent 4,275,385, 1981 - Google Patents
Electronics, 12/22/77, Two-Chip Set Uses Infrared Pulse to Control TVs, p. 119. GE-Tech. Training Man., TV 1978 Line, 7/1977, Remote/Electronic Tuning Syst., pp.-l-2, 6-9. LED Ckts …
JW Crimmins, JL Saulnier - US Patent 5,621,384, 1997 - Google Patents
BACKGROUND OF THE INVENTION Some businesses have a need to monitor the locations of people or equipment. For example, hospitals might desire to monitor the location …
WA Davidson, DH Larson - US Patent 4,932,050, 1990 - Google Patents
A multitude of customized services are presently available for serving telephone customer needs. Illustra tive of such a service is a call forwarding feature which enables a customer to …
RT Shipley - US Patent App. 08/144,746, 1995 - Google Patents
Personnel locating system for use in a facility having a [63] Continuation of Ser. No. 856,646, Apr. 25, 1986, plurality of rooms having doorways therein comprised abandoned, which is a …
BL Guest, LC Laney, DK Fredrickson - US Patent 4,990,892, 1991 - Google Patents
[57] ABSTRACT A personnel locator system for monitoring the locations of classes of personnel. Members of classes of personnel carry portable, infrared transmitters which …
CA Will - US Patent 5,588,009, 1996 - Google Patents
57 ABSTRACT A method and apparatus for sending paging signals and messages to individuals within a building and accepting responses to the messages. Messages may be …
CA Will - US Patent 5,479,408, 1995 - Google Patents
A method and apparatus for sending paging signals and messages to individuals within a building and accepting responses to the messages. Messages may be initiated by electronic …
RT Shipley - US Patent 4,601,064, 1986 - Google Patents
(57) ABSTRACT A communications system provides for the location or tracking of persons or objects to automatically establish two-way conversation with the person located via an …
WF Simon, WC Torrey, CW Hull - US Patent 4,225,953, 1980 - Google Patents
BACKGROUND OF THE INVENTION The present invention pertains to the? eld of person nel locating systems. Systems of this general type have been proposed in the prior art for …