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Pullman, WA, United States of America

Schweitzer Engineering Laboratories, Inc.

USPTO Granted Patents = 755

% Expired Patents = 9.7

CIPO Patents = 4

EPO Patents = 5

Trademarks = 55

Forward Citations = 6,100

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450 inventors (with patents filed for the assignee):

Edmund O Schweitzer, Iii (123 out of 127 patents)

David E Whitehead (66 out of 66 patents)

Armando Guzman-Casillas (59 out of 60 patents)

4. Bogdan Zdzislaw Kasztenny (53 out of 71 patents)

5. Normann Fischer (41 out of 41 patents)

6. Tony J Lee (40 out of 41 patents)

7. Veselin Skendzic (37 out of 47 patents)

8. Gregary C Zweigle (36 out of 36 patents)

9. Scott M Manson (33 out of 33 patents)

10. Mangapathirao Venkata Mynam (30 out of 30 patents)

11. Shankar V Achanta (29 out of 29 patents)

12. Marcos A Donolo (28 out of 28 patents)

13. Rhett Smith (28 out of 29 patents)

14. Krishnanjan Gubba Ravikumar (27 out of 38 patents)

15. Colin Gordon (27 out of 27 patents)

Core Competencies:

Network Time Synchronization

Multi-Channel Protection

Current Sensor

Voltage Regulator

Fault Location

Cybersecurity

Microgrid Stability

Electric Power Distribution

Relay Protection

Signal Monitoring

Communication Links

Power System Management

755 patents: Sort by Forward Citations

1. 12749892 - Asynchronous distributed control design using tiered automation algorithms (2026-09-29),

2. 12744371 - Adaptive commutation hybrid circuit breaker (2026-09-22),

3. 12699559 - Firmware validation for power delivery system using simulated power delivery system values (2026-08-04),

4. 12695296 - High-impedance bus differential protection (2026-07-28),

5. 12693366 - Test point voltage sensor (2026-07-28),

6. 12683384 - Voltage selection control scheme for synchronism check in digital substations (2026-07-14),

7. 12683374 - Testing system for distributed power delivery protection or control system (2026-07-14),

8. 12621119 - Communication of network time synchronization (2026-05-05),

9. 12603490 - Protective device with multi-channel line current differential protection (2026-04-14),

10. 12601763 - Current sensor with adjacent conductor rejection (2026-04-14),

11. 12592582 - Voltage regulator control in electric power systems with distributed generation (2026-03-31),

12. 12578374 - Multi-ended impedance-based fault locating for untransposed transmission lines (2026-03-17),

13. 12556358 - Adaptive clock offset estimation for protection devices without time-based synchronization (2026-02-17),

14. 12526229 - Communication device operable to switch between multiple control plane types (2026-01-13),

15. 12506360 - Redundant generic object oriented substation event (GOOSE) messages with live and test power system data (2025-12-23),

Schweitzer Engineering Laboratories, Inc. (SEL) is a leading provider of innovative solutions for electric power systems, headquartered in Pullman, Washington. The company specializes in developing advanced technologies for network time synchronization, multi-channel protection, current sensors, and voltage regulation. SEL's expertise extends to fault location, cybersecurity, microgrid stability, and electric power distribution, contributing to the reliability and efficiency of power systems globally. Its commitment to research and development positions SEL at the forefront of the electric utility industry.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

Schweitzer Engineering Laboratories, Inc.

755 Patents

#1 in Pullman, WA

#10 in Washington

#667 in US

#1,316 in the World

Pullman, WA, United States of America

Schweitzer Engineering Laboratories, Inc.

Forward Citations = 6,100

450 inventors:

Edmund O Schweitzer, Iii (123 out of 127 patents)

David E Whitehead (66 out of 66 patents)

Armando Guzman-Casillas (59 out of 60 patents)

4. Bogdan Zdzislaw Kasztenny (53 out of 71 patents)

5. Normann Fischer (41 out of 41 patents)

Please report any incorrect information to [email protected]

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