WL

Warren S. Letzsch

ST Stone & Webster Process Technology: 4 patents #1 of 40Top 3%
SE Stone & Webster Engineering: 3 patents #17 of 74Top 25%
TR Total Engineering And Research: 1 patents #3 of 7Top 45%
Overall (All Time): #582,595 of 4,157,543Top 15%
9
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
7479218 Deep catalytic cracking process 2009-01-20
7429363 Riser termination device Ed Yuan, Gary Jackson, Jim Evans, John Hood 2008-09-30
7273543 Process and apparatus for controlling catalyst temperature in a catalyst stripper 2007-09-25
6905591 Deep catalytic cracking process 2005-06-14
5766558 Fluid catalytic cracking process and apparatus Gerald Earl 1998-06-16
5723040 Fluid catalytic cracking process and apparatus Gerald Earl 1998-03-03
5662868 Short residence time cracking apparatus and process Gerald Earl 1997-09-02
RE33728 Method for catalytically converting residual oils Robert R. Dean, Jean-Louis Mauleon 1991-10-29
4415438 Method for catalytically converting residual oils Robert R. Dean, Jean-Louis Mauleon 1983-11-15