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For the Inventor, By the Inventor

Northport, NY, United States of America

George B Litchford

This inventor holds 14 USPTO granted patents. Top assignees: Litchstreet Company, H&l Company. Active years: 1976-1993.

IDiyas Innovation Intelligence. (2026). Inventor Profile: George B Litchford. Retrieved from https://idiyas.com/inventor/george-b-litchford

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 14

% Patents Active = 100.0

Average Co-Inventor Count = 1.5

ph-index = 10

Forward Citations = 463(Granted Patents)


Company Filing History:

goldMedal13 out of 13 
 
Litchstreet Company
 patents
silverMedal1 out of 2 
 
H&l Company
 patents

Years Active: 1976-1993

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14 patents (USPTO):Explore Patents
1. 5198823 - Passive secondary surveillance radar using signals of remote SSR and (1993-03-30),
2. 5196856 - Passive SSR system utilizing P3 and P2 pulses for synchronizing (1993-03-23),
3. 5140328 - Virtual secondary surveillance radar using signals of remote SSR (1992-08-18),
4. 4899156 - Virtual ATCRBS using signals of remote SSR (1990-02-06),
5. 4789865 - Collision avoidance system (1988-12-06),
6. 4768036 - Collision avoidance system (1988-08-30),
7. 4733241 - Position finding and collision avoidance system (1988-03-22),
8. 4642648 - Simple passive/active proximity warning system (1987-02-10),
9. 4486755 - Collision avoidance system (1984-12-04),
10. 4191958 - Radiolocation with respect to an Own station, using Omega signals or the (1980-03-04),
11. 4115771 - Passive ATCRBS using signals of remote SSR (1978-09-19),
12. 4027307 - Collision avoidance/proximity warning system using secondary radar (1977-05-31),
13. 4021802 - Collision avoidance system (1977-05-03),
14. 3959793 - Proximity indication with means for computing the distance from an own (1976-05-25),

Title: Innovations of George B Litchford in Passive Surveillance Systems

Introduction

George B. Litchford, an accomplished inventor based in Northport, NY, holds a remarkable portfolio of 14 patents. His contributions significantly enhance passive secondary surveillance radar systems and collision avoidance technologies, marking him as a key figure in the field of aviation safety.

Latest Patents

Litchford's recent patents showcase groundbreaking advancements in radar technology. One such invention is a passive secondary surveillance radar (PSSR) that utilizes signals from remote SSR. This innovative approach involves replacing traditional omnidirectional antennas with a stationary array of directive antennas, arranged in a circle, allowing for improved reception of transponder replies. By strategically switching on antennas to cover sectors as a rotating beam from the SSR targets them, the system ensures that a high-gain antenna is optimally positioned to capture replies, thereby increasing the detection range significantly.

Another significant patent is focused on a passive SSR system that utilizes P3 and P2 pulses for synchronization. This method greatly enhances the range from which a collision avoidance system can receive SSR interrogations by employing P2 pulses for timing measurement when P1-P3 pulse pairs are not available. The innovation effectively separates reply messages into two families, enhancing the accuracy of collision avoidance systems and reducing false alarms compared to previous technologies.

Career Highlights

Throughout his career, Litchford has engaged with notable organizations such as Litchstreet Company and H&L Company. His work has been pivotal in applying advanced technological concepts to real-world applications, showcasing his deep understanding of radar systems and their operational efficiencies.

Collaborations

Litchford has collaborated with esteemed professionals, including Burton L. Hulland and John Keller. These partnerships have fostered a creative environment, resulting in innovative solutions that address complex challenges in radar technology.

Conclusion

George B. Litchford's contributions to passive surveillance systems reflect his dedication to improving aviation safety through innovation. With a growing list of patents and successful collaborations, Litchford continues to inspire future advancements in radar technology, solidifying his legacy in the field.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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