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Trademarks = 3

Forward Citations = 313

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3 inventors (with patents filed for the assignee):

Lawrence B Marsh (11 out of 14 patents)

Donald B Heckman (4 out of 4 patents)

John D Wright (2 out of 3 patents)

14 patents: Sort by Forward Citations

1. 6598487 - Magnetic flowmeter having a separable magnet/electrode assembly (2003-07-29),

2. 5811688 - Open channel flowmeter utilizing surface velocity and lookdown level (1998-09-22),

3. 5684250 - Self-calibrating open-channel flowmeter (1997-11-04),

4. 5644088 - Port forward sensor for liquid level gauge or flowmeter (1997-07-01),

5. 5594179 - Tracer type flowmeter and method using two or more injected trace (1997-01-14),

6. 5544531 - Flowmeter having active temperature compensation (1996-08-13),

7. 5421211 - Liquid flowmeter including doppler signal processing, and method (1995-06-06),

8. 5398552 - Magnetic flowmeter having a separable magnetic assembly (1995-03-21),

9. 5385056 - Pump station flowmeter (1995-01-31),

10. 5263374 - Flowmeter with concentrically arranged electromagnetic field (1993-11-23),

11. 4549434 - Pressure level sensor (1985-10-29),

12. 4459858 - Flow meter having an electromagnetic sensor probe (1984-07-17),

13. 4083246 - Fluid flow meter (1978-04-11),

14. 4015471 - Spherical electromagnetic water current velocity sensor with protruding (1977-04-05),

Marsh-McBirney, Inc. is a leading manufacturer of flow measurement and monitoring equipment for water and wastewater industries. With over 100 years of experience, they offer advanced solutions for flow meters, samplers, and data management systems. Their products are designed to provide accurate and reliable flow data to help optimize water and wastewater treatment processes.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

14 Patents

#6 in Frederick, MD

#305 in Maryland

#22,289 in US

#42,168 in the World

Frederick, MD, United States of America

Marsh-Mcbirney, Inc.

Forward Citations = 313

3 inventors:

Lawrence B Marsh (11 out of 14 patents)

Donald B Heckman (4 out of 4 patents)

John D Wright (2 out of 3 patents)

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