US 11,988,798 B1
Buried utility marker devices, systems, and methods
Stephanie M. Bench, Atlanta, GA (US); and Mark S. Olsson, La Jolla, CA (US)
Assigned to SeeScan, Inc., San Diego, CA (US)
Filed by SeeScan, Inc., San Diego, CA (US)
Filed on Apr. 28, 2022, as Appl. No. 17/731,579.
Application 17/731,579 is a continuation of application No. 16/551,653, filed on Aug. 26, 2019, granted, now 11,333,786.
Application 16/551,653 is a continuation of application No. 15/434,056, filed on Feb. 16, 2017, granted, now 10,401,526, issued on Sep. 3, 2019.
Claims priority of provisional application 62/295,502, filed on Feb. 16, 2016.
This patent is subject to a terminal disclaimer.
Int. Cl. G01V 3/16 (2006.01); G01V 3/10 (2006.01); G01V 3/15 (2006.01); G01V 3/165 (2006.01); G01V 15/00 (2006.01)
CPC G01V 3/165 (2013.01) [G01V 3/10 (2013.01); G01V 3/15 (2013.01); G01V 15/00 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A buried utility marker device, comprising:
a marker device antenna; and
an electronic circuit operatively coupled to an output of the marker device antenna, the electronic circuit including:
a first resonant circuit for receiving an excitation signal at a first frequency from a marker excitation device;
a power circuit for converting the excitation signal to a power supply for powering the electronic circuit;
a processing element for generating an output signal responsive to the excitation signal; and
a second resonant circuit for providing the output signal to the marker device antenna, wherein the output signal is generated at a second frequency different from the first frequency, wherein the marker device comprises an elongate ground-stake shaped apparatus.