System for detecting and measuring parameters of passive transponders

US008072310B1

(12) UIllt€d States Patent (10) Patent No.: US 8,072,310 B1 Everhart (45) Date of Patent: Dec. 6, 2011 (54) SYSTEM FOR DETECTING AND 2 * 1(1); 5/%I1bif1I}11 31 342/40 , , otrs er et . .............. .. MEASURING PARAMETERS OF PASSIVE 5,329,944 A 7/1994 Fabian et 31‘ TRANSPONDERS 5,433,115 A 7/1995 Spillman, Jr. et al. 5,456,718 A 10/1995 Szymaitis (75) Inventor: Howard Richard Everhart, Winchester, 5,581,249 A 12/ 1996 Yoshida CA (US) 5,664,582 A 9/1997 Szymaitis 5,724,002 A * 3/1998 Hulick ........................ .. 329/361 (73) Assignee: Pulsed Indigo Inc., Winchester, CA 2 gjgfillc (US) 6,159,156 A 12/2000 Van Bockel 6,206,835 B1 3/2001 Spillman, Jr. ( * ) Notice: Subject to any disclaimer, the term of this 6,309,350 B1 10/2001 VaI_1TaSSe1 patent is extended or adjusted under 35 6319208 B1 11/ 2001 A/Dlta et a1‘ 6,442,413 B1 8/2002 Srlver Us-C 154(b)by 833 dayS- 6,476,708 B1* 11/2002 Johnson ................... .. 340/10.34 6,638,231 B2 10/2003 Govari et al. (21) Appl. No.: 12/156,535 6,682,490 B2 1/2004 Roy et al. 7,123,129 B1* 10/2006 Schrott et al. .............. .. 340/10.1 (22) Filed: Jun_2 2008 7,147,606 B1 12/2006 Chang et al. , 7,211,048 B1 5/2007 Najafi et al. . . 2005/0006473 A1* 1/2005 Deguchiet al. ............. .. 235/451 Related U-S Apphcatlon Data 2006/0286938 A1* 12/2006 Murdoch ..... .. (60) Provisional application No. 60/942,031, filed on Jun. *20_07(/10296881 {M * 5/2007 Plum """""""""""" " 340/1051 5’ 2007_ crte y examrner (51) Int_ CL Primary Examiner * Daniel Wu H04Q 5/22 (2()()6_()1) Assistant Examiner * Frederick Ott (52) U.S. Cl. .............. .. 340/10.1; 340/538.12; 73/862.41 (74) Attorney, Agent, Or Firm * Kirk A Buhler; Buhler & (58) Field of Classification Search ............... .. 340/10.1, Assoclates 340/572.1, 572.4, 572.5, 572.76,0507/2.287;’ A6‘(2)(2)/342253, (57) ~ AFSTRACT ~ See application file for Complete Search history A detection and paramedrc measurrng system using a transponder composed of passive components and pulse induc(56) References Cited tive interrogation is disclosed. A methodology based on mea

U.S. PATENT DOCUMENTS

suring the quality factor of the transponder is employed to detect a specific species of transponder or measure a param

4,114,601 A 9/1978 Abels eter that alters the transponders quality factor.
4,531,526 A * 7/1985 Genest ........................ .. 600/300
4,658,818 A 4/1987 Miller, Jr. et al. 12 Claims, 4 Drawing Sheets
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