Patent Leaderboard
All Time
2025
2024
2023
2022
2021
2020
2019
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
1991
1990
1989
1988
1987
1986
1985
1984
1983
1982
1981
1980
Search
Companies
Inventors
CJ
C. Donald Johnson
HA
Harsco
: 1 patents #40 of 125
Top 35%
Overall (All Time):
#4,023,384
of 4,157,543
Top 100%
1
Patents All Time
Issued Patents
All Time
Profile Widget
Patent #
Title
Co-Inventors
Date
4548229
Open-closed center hydraulic valve assembly
—
1985-10-22
×
Your Patent Widget
Preview how it looks, then copy the embed code to add it to your website.
Embed Code
<iframe src="https://www.patentleaderboard.com/widget/inventor/2812559" width="100%" height="400" frameborder="0" style="border:none;border-radius:12px;display:block;"></iframe>
Copy Embed Code