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For the Inventor, By the Inventor

Foothill Ranch, CA, United States of America

Gatekeeper Systems, Inc.


USPTO Granted Patents = 82

% Expired Patents = 2.4



Trademarks = 18

Forward Citations = 1,683

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17 inventors (with patents filed for the assignee):

goldMedal Scott J Carter (62 out of 75 patents)

silverMedal Stephen E Hannah (61 out of 63 patents)

bronzeMedal Jesse Michael James (53 out of 53 patents)

4.  Narayanan V Ramanathan (16 out of 16 patents)

5.  John C McKay (9 out of 18 patents)

6.  Robert M Harling (6 out of 6 patents)

7.  Jack Johnson (6 out of 8 patents)

8.  Jeffrey J Lace (4 out of 18 patents)

9.  Chandrashekhar Ekbote (3 out of 3 patents)

10.  Jack Durban (3 out of 5 patents)

11.  James E Chandler (2 out of 12 patents)

12.  Ryan M Morrison (2 out of 2 patents)

13.  Ho Man M Fong (2 out of 2 patents)

14.  Jeffrey O Berg (1 out of 1 patent)

15.  Joseph D Berg (1 out of 2 patents)


Core Competencies:
Computer Vision
Navigation Systems
Anti-Theft Solutions
Cart Monitoring
Wheeled Vehicles
Motion Estimation
Magnetometer Calibration
Solar Powered Transmitter
Brake Mechanism
Cart Connection Assemblies
Power Generation
Usage Monitoring

82 patents:

1. 12718672 - Anti-theft system configured to reduce false positives (2026-08-25),
2. 12596135 - Wheel capable of detecting direction of rotation (2026-04-07),
3. 12482334 - Shopping basket monitoring using computer vision (2025-11-25),
4. 12131647 - Estimating motion of wheeled carts (2024-10-29),
5. 12106644 - Shopping basket monitoring using computer vision and machine learning (2024-10-01),
6. 12099107 - Dual magnetometer calibration (2024-09-24),
7. 12044696 - Wheel capable of detecting direction of rotation (2024-07-23),
8. 12033481 - Shopping basket monitoring using computer vision and machine learning (2024-07-09),
9. 11990009 - Shopping basket monitoring using computer vision (2024-05-21),
10. 11981365 - System for monitoring and controlling shopping cart usage (2024-05-14),
11. 11975568 - Self-adjusting caster assemblies (2024-05-07),
12. 11718336 - Navigation systems and methods for wheeled objects (2023-08-08),
13. 11675040 - Dual magnetometer calibration (2023-06-13),
14. 11414117 - Anti-theft system that uses shopping cart location and vibration data (2022-08-16),
15. 11358621 - System for monitoring and controlling shopping cart usage (2022-06-14),
Gatekeeper Systems, Inc., based in Foothill Ranch, CA, specializes in advanced shopping cart monitoring solutions. The company leverages cutting-edge technologies such as computer vision and navigation systems to enhance anti-theft measures and improve cart management. Their innovations include motion estimation and magnetometer calibration, ensuring efficient tracking and security of wheeled vehicles. Gatekeeper Systems is committed to providing solar-powered transmitters that facilitate sustainable and effective monitoring in retail environments.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

Gatekeeper Systems, Inc.
82 Patents

#5 in Foothill Ranch, CA

#1,046 in California

#4,522 in US

#9,246 in the World

Foothill Ranch, CA (US)
Foothill Ranch, CA, United States of America

Gatekeeper Systems, Inc.

Forward Citations = 1,683

17 inventors:

goldMedal Scott J Carter (62 out of 75 patents)

silverMedal Stephen E Hannah (61 out of 63 patents)

bronzeMedal Jesse Michael James (53 out of 53 patents)

4.  Narayanan V Ramanathan (16 out of 16 patents)

5.  John C McKay (9 out of 18 patents)

Please report any incorrect information to [email protected]
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