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For the Inventor, By the Inventor

Norman, OK, United States of America

K-f Prince Valve, Inc.


USPTO Granted Patents = 2

Forward Citations = 22

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1 inventor (with patents filed for the assignee):

goldMedal Darryll G Prince (2 out of 3 patents)


2 patents:

1. 4304255 - Swing check valve (1981-12-08),
2. 4261383 - Field convertible sump check valve (1981-04-14),
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USPTO Data Jan 1 1976 - Dec 30 2025

2 Patents

#21 in Norman, OK

#559 in Oklahoma

#92,637 in US

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Norman, OK, United States of America

K-f Prince Valve, Inc.

Forward Citations = 22

1 inventor:

goldMedal Darryll G Prince (2 out of 3 patents)

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