Richard J. Hartman

CS Chaparral Steel: 4 patents #1 of 12Top 9%

LF L.B. Foster: 1 patents #8 of 30Top 30%

MC Mine Safety Appliances Company: 1 patents #104 of 243Top 45%

🗺 Pennsylvania: #15,920 of 74,527 inventorsTop 25%

Overall (All Time): #1,029,961 of 4,157,543Top 25%

Patents All Time

Issued Patents All Time

Showing 1–5 of 5 patents

Patent #	Title	Co-Inventors	Date
7360969	Z-shaped sheet piling	—	2008-04-22
7168891	Z-shaped sheet piling	—	2007-01-30
7018140	Z-shaped sheet piling	—	2006-03-28
6420014	Z-shaped sheet piling	—	2002-07-16
D441440	Dust cassette assembly	—	2001-05-01