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For the Inventor, By the Inventor

Walla Walla, WA, United States of America

Nelson Irrigation Corporation


USPTO Granted Patents = 168

% Expired Patents = 13.7



Trademarks = 7

Forward Citations = 3,534

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41 inventors (with patents filed for the assignee):

goldMedal Craig B Nelson (67 out of 72 patents)

silverMedal George L Sesser (49 out of 56 patents)

bronzeMedal Lee A Perkins (21 out of 21 patents)

4.  Riley D Greenwood (19 out of 19 patents)

5.  Larry P Meyer (18 out of 20 patents)

6.  Chad Daniel Leinweber (15 out of 16 patents)

7.  Barton R Nelson (14 out of 14 patents)

8.  Cliff Paul Ungerecht (12 out of 12 patents)

9.  Michael R Townsend (11 out of 11 patents)

10.  Joseph Daniel Sinden (10 out of 11 patents)

11.  Meade M Neal (9 out of 9 patents)

12.  Mark A Bauman (8 out of 14 patents)

13.  Steven E Crawford (7 out of 7 patents)

14.  Reid A Nelson (7 out of 7 patents)

15.  Paul D Davisson (7 out of 8 patents)


Core Competencies:
Irrigation Sprinkler
Pressure Regulator
Wireless Network
Multi-Function Valve
Orbital Sprinkler
Flow Control Device
Quick Connect Coupler
Automatic Nozzle Changer
Proximity Programmed Controller
Sprinkler Assembly
Deflector Plate
Rotary Nozzle

168 patents:

1. 12564848 - Irrigation sprinkler with multiple patterns and rotation speeds (2026-03-03),
2. 12366259 - Sprinkler with trellis wire mounting clip (2025-07-22),
3. 12364217 - Variable rate irrigation using motion sensor (2025-07-22),
4. 12186766 - Nozzle and sprinkler for center pivot end (2025-01-07),
5. 12036569 - Automatic reversible arc sprinkler (2024-07-16),
6. 11964293 - Rigid mount orbitor sprinkler (2024-04-23),
7. 11933408 - Multi-function pressure regulation valve (2024-03-19),
8. 11885450 - Quick connect coupler (2024-01-30),
9. 11745207 - Sprinkler with modular components and pop up deflector with lug(s) for rotational engagement (2023-09-05),
10. 11576012 - Wireless network (2023-02-07),
11. 11511290 - Flow control device with drain check (2022-11-29),
12. D966123 - Pressure regulator (2022-10-11),
13. 11408515 - Pressure regulator having an oblique valve seat (2022-08-09),
14. 11376621 - Sprinkler assembly having coiled weight (2022-07-05),
15. 11325147 - Sprinkler with modular components and pop-up deflector (2022-05-10),
Nelson Irrigation Corporation, based in Walla Walla, WA, specializes in advanced irrigation technology aimed at enhancing agricultural efficiency and sustainability. The company develops a range of innovative products including irrigation sprinklers, pressure regulators, and multi-function valves. Their expertise extends to wireless network solutions and flow control devices, which facilitate precise water management. Nelson's commitment to research and development positions it as a leader in the irrigation sector, addressing the evolving needs of modern agriculture.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

Nelson Irrigation Corporation
168 Patents

#1 in Walla Walla, WA

#43 in Washington

#2,370 in US

#4,908 in the World

Walla Walla, WA (US)
Walla Walla, WA, United States of America

Nelson Irrigation Corporation

Forward Citations = 3,534

41 inventors:

goldMedal Craig B Nelson (67 out of 72 patents)

silverMedal George L Sesser (49 out of 56 patents)

bronzeMedal Lee A Perkins (21 out of 21 patents)

4.  Riley D Greenwood (19 out of 19 patents)

5.  Larry P Meyer (18 out of 20 patents)

Please report any incorrect information to [email protected]
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