RH

Richard Hsieh

TC The F.B. Leopold Company: 4 patents #2 of 10Top 20%
📍 Zelienople, PA: #29 of 127 inventorsTop 25%
🗺 Pennsylvania: #15,920 of 74,527 inventorsTop 25%
Overall (All Time): #1,047,474 of 4,157,543Top 30%
5
Patents All Time

Issued Patents All Time

Showing 1–5 of 5 patents

Patent #TitleCo-InventorsDate
6312611 Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes Eugene O. Bergman, John L. Geibel 2001-11-06
6306310 Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes Eugen O. Bergmann, John L. Geibel 2001-10-23
6164349 Machine for cutting plates from timber 2000-12-26
5639384 Apparatus and method for improving gas backwash in lateral underdrains Marvin A. Brown, Eugen O. Bergmann 1997-06-17
5489388 Apparatus and method for improving gas backwash in lateral underdrains Marvin A. Brown, Eugen O. Bergmann 1996-02-06