Assignee
AMTECH SYSTEMS LLC
US45 patents
Top patents by PatentIndex Score
US10121289B1Nov 6, 2018
Vehicle-based electronic toll system with interface to vehicle display
AMTECH SYSTEMS LLC32 citations98
US10769392B1Sep 8, 2020
Vehicle tracking system using transponders
AMTECH SYSTEMS LLC12 citations92
US9785804B2Oct 10, 2017
Multi-protocol RFID system
AMTECH SYSTEMS LLC8 citations92
US9361492B2Jun 7, 2016
Multi-protocol RFID system
AMTECH SYSTEMS LLC11 citations92
US8344886B2Jan 1, 2013
RFID vehicle tag with manually adjustable data fields
AMTECH SYSTEMS LLC18 citations92
US10134210B1Nov 20, 2018
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC14 citations91
US10467440B2Nov 5, 2019
Multi-protocol RFID system
AMTECH SYSTEMS LLC3 citations84
US10083329B2Sep 25, 2018
Multi-protocol RFID system
AMTECH SYSTEMS LLC4 citations84
US9262656B2Feb 16, 2016
Multi-protocol RFID system
AMTECH SYSTEMS LLC4 citations84
US9313559B2Apr 12, 2016
Automatic mode detection in a dual operating mode RFID tag
AMTECH SYSTEMS LLC8 citations83
US9633238B2Apr 25, 2017
RFID system with time slot interleaving
AMTECH SYSTEMS LLC9 citations82
US11257303B2Feb 22, 2022
Vehicle-based electronic toll system with interface to vehicle display
AMTECH SYSTEMS LLC2 citations73
US10896552B2Jan 19, 2021
Vehicle-based electronic toll system with interface to vehicle display
AMTECH SYSTEMS LLC3 citations73
US10733393B2Aug 4, 2020
Multi-protocol RFID system
AMTECH SYSTEMS LLC1 citations73
US10275949B2Apr 30, 2019
RFID vehicle tag with manually adjustable data fields
AMTECH SYSTEMS LLC1 citations73
US9558383B2Jan 31, 2017
Intermodulation mitigation technique in an RFID system
AMTECH SYSTEMS LLC2 citations73
US9305404B2Apr 5, 2016
RFID vehicle tag with manually adjustable data fields
AMTECH SYSTEMS LLC3 citations73
US11039284B1Jun 15, 2021
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC1 citations72
US10708745B2Jul 7, 2020
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC3 citations72
US12056566B1Aug 6, 2024
Vehicle tracking system using transponders
AMTECH SYSTEMS LLC1 citations71
US11663427B1May 30, 2023
Vehicle tracking system using transponders
AMTECH SYSTEMS LLC1 citations71
US11341345B1May 24, 2022
Vehicle tracking system using transponders
AMTECH SYSTEMS LLC3 citations71
US10210752B2Feb 19, 2019
RFID system with time slot interleaving
AMTECH SYSTEMS LLC2 citations71
US11887406B2Jan 30, 2024
Vehicle-based electronic toll system with interface to vehicle display
AMTECH SYSTEMS LLC0 citations63
US12505322B2Dec 23, 2025
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC0 citations62
US12483870B2Nov 25, 2025
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC0 citations62
US12437285B1Oct 7, 2025
Vehicle tracking system for congestion pricing using transponders
AMTECH SYSTEMS LLC1 citations62
US12015969B2Jun 18, 2024
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC0 citations62
US11836569B1Dec 5, 2023
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC0 citations62
US11288464B2Mar 29, 2022
Multi-protocol RFID system
AMTECH SYSTEMS LLC0 citations62
US12069552B2Aug 20, 2024
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC0 citations61
US11450203B2Sep 20, 2022
RFID system with time slot interleaving
AMTECH SYSTEMS LLC0 citations61
US11323865B2May 3, 2022
Vehicle tracking system using smart-phone as active transponder
AMTECH SYSTEMS LLC0 citations61
US9316728B1Apr 19, 2016
System and method for estimating range to an RFID tag
AMTECH SYSTEMS LLC1 citations60
US9081088B1Jul 14, 2015
System and method for estimating range to an RFID tag
AMTECH SYSTEMS LLC3 citations60
US10489987B2Nov 26, 2019
Vehicle-based electronic toll system with interface to vehicle display
AMTECH SYSTEMS LLC0 citations52
US10607044B2Mar 31, 2020
Automatic mode detection in a dual operating mode RFID tag
AMTECH SYSTEMS LLC0 citations51
US10346648B2Jul 9, 2019
Automatic mode detection in a dual operating mode RFID tag
AMTECH SYSTEMS LLC0 citations51
US9996715B2Jun 12, 2018
Automatic mode detection in a dual operating mode RFID tag
AMTECH SYSTEMS LLC0 citations51
USRE46447EJun 20, 2017
RFID mutual authentication verification session
AMTECH SYSTEMS LLC0 citations51
US9607190B2Mar 28, 2017
Automatic mode detection in a dual operating mode RFID tag
AMTECH SYSTEMS LLC0 citations51
US10302756B2May 28, 2019
System and method for estimating range to an RFID tag
AMTECH SYSTEMS LLC0 citations49
US9841500B2Dec 12, 2017
System and method for estimating range to an RFID tag
AMTECH SYSTEMS LLC0 citations49
US8770472B2Jul 8, 2014
System and method for automated HOV lane toll collection
AMTECH SYSTEMS LLC0 citations45
US9396367B2Jul 19, 2016
System and method for synchronizing RFID readers utilizing RF or modulation signals
AMTECH SYSTEMS LLC0 citations33