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For the Inventor, By the Inventor

Royal Oak, MI, United States of America

Prn Services, Inc.


USPTO Granted Patents = 2

Forward Citations = 108

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1 inventor (with patents filed for the assignee):

goldMedal Frederick L Erlich (2 out of 6 patents)


2 patents:

1. 5181913 - Catheter with check valve and rolled sheath (1993-01-26),
2. 4772275 - Sheath for devices for injecting or withdrawing body fluids (1988-09-20),
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USPTO Data Jan 1 1976 - Dec 30 2025

2 Patents

#22 in Royal Oak, MI

#3,127 in Michigan

#92,642 in US

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Royal Oak, MI, United States of America

Prn Services, Inc.

Forward Citations = 108

1 inventor:

goldMedal Frederick L Erlich (2 out of 6 patents)

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