Patent assignee · US · COMPANY

Gatekeeper Systems, Inc.

75Patents
72Active
75Granted
58Portfolio score

Filing activity: Oct 25, 1999 → Sep 13, 2023 · 6 expiring within 5 years

Most-cited patents

PatentTitleAreaCited byStatus
US8046160B2 Navigation systems and methods for wheeled objects Emerging Cross-Sectional Technologies 139 Active
US7944368B2 Systems and methods for locating and controlling powered vehicles Performing Operations; Transporting 121 Active
US8433507B2 Usage monitoring of shopping carts or other human-propelled vehicles Emerging Cross-Sectional Technologies 77 Active
US8700230B1 Cart containment system with integrated cart display unit Emerging Cross-Sectional Technologies 76 Active
US6362728B1 Anti-theft vehicle system Performing Operations; Transporting 75 Expired
US8463540B2 Two-way communication system for tracking locations and statuses of wheeled vehicles Emerging Cross-Sectional Technologies 73 Active
US6945366B2 Anti-theft vehicle system Performing Operations; Transporting 69 Expired
US7658247B2 Systems and methods for power storage and management from intermittent power sources Emerging Cross-Sectional Technologies 65 Active
US8674845B2 Systems and methods for locating and controlling powered vehicles using a received strength indication signal Performing Operations; Transporting 41 Active
US9606238B2 Low-energy consumption location of movable objects Physics 36 Active
US9091551B2 System for controlling usage of shopping carts or other human-propelled vehicles Emerging Cross-Sectional Technologies 35 Active
US8406993B2 Cart braking control during mechanized cart retrieval Emerging Cross-Sectional Technologies 34 Active
US8820447B2 Power generation systems and methods for wheeled objects Emerging Cross-Sectional Technologies 33 Active
US9403548B2 Monitoring usage or status of cart retrievers Emerging Cross-Sectional Technologies 32 Active
US8558698B1 Zone-based control of cart usage using RF transmission for brake activation Emerging Cross-Sectional Technologies 32 Active
US8578984B2 Non-motorized vehicle wheel replacement treads and methods Emerging Cross-Sectional Technologies 29 Active
US9630639B2 Navigation systems and methods for wheeled objects Emerging Cross-Sectional Technologies 25 Active
US8894086B2 Cart connection assemblies and methods Performing Operations; Transporting 25 Active
US9669659B2 Brake mechanism for a non-motorized wheeled vehicle Mechanical Engineering; Lighting; Heating 24 Active
US6353388B1 Anti-theft vehicle system Physics 23 Expired
US8417445B2 System for communicating with and monitoring movement of human-propelled vehicles Emerging Cross-Sectional Technologies 23 Active
US8570171B2 System for detecting unauthorized store exit events using signals detected by shopping cart wheels units Emerging Cross-Sectional Technologies 23 Active
US9205702B2 Non-motorized vehicle wheel replacement treads and methods Emerging Cross-Sectional Technologies 22 Active
US8751148B2 Navigation systems and methods for wheeled objects Emerging Cross-Sectional Technologies 22 Active
US8606501B2 System for monitoring usage of shopping carts or other human-propelled vehicles Emerging Cross-Sectional Technologies 21 Active

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.