[54] LOCATOR DEVICE
[75] Inventors: David L. Ladner, Minneapolis;
Andrea J. Grazzini, Eagan, both of
Minn.
[73] Assignee: Peoplenet, Inc., Minneapolis, Minn.
[21] Appl. No.: 332,351
[22] Filed: Oct. 31,1994
[51] Int. CI.6 H04Q 1/00
[52] U.S. CI 340/825.06; 340/825.44;
340/825.45; 340/825.49; 342/457
[58] Field of Search 340/825.49, 825.45,
340/825.44, 991, 825.34, 825.06; 342/357,
457
[56] References Cited
U.S. PATENT DOCUMENTS
4,057,794 11/1977 Grossfield 340/825.45
4,384,288 5/1983 Walton 340/825.34
4,706,689 11/1987 Man 128/903
4,742,357 5/1988 Rackley 342/457
4,797,948 1/1989 Milliorn et al 455/54
4,827,395 5/1989 Anders et al 364/138
4,952,928 8/1990 Carroll et al 340/825.54
4,998,095 3/1991 Shields 340/825.49
