Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
WK

W. Ralph Knowles

ELElectroscan: 2 patents #2 of 10Top 20%
FEFei: 2 patents #250 of 681Top 40%
PAPhilips Electronics North America: 2 patents #192 of 725Top 30%
Lowell, MA: #116 of 739 inventorsTop 20%
Massachusetts: #20,307 of 88,656 inventorsTop 25%
Overall (All Time): #877,878 of 4,157,543Top 25%
6 Patents All Time

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDate
6979822 Charged particle beam system Diane K. Stewart, Brian T. Kimball 2005-12-27
6025592 High temperature specimen stage and detector for an environmental scanning electron microscope Thomas A. Hardt 2000-02-15
5945672 Gaseous backscattered electron detector for an environmental scanning electron microscope Thomas A. Hardt, Peter D. Smith 1999-08-31
5828064 Field emission environmental scanning electron microscope 1998-10-27
5412211 Environmental scanning electron microscope 1995-05-02
5362964 Environmental scanning electron microscope William G. Schultz, Allen E. Armstrong 1994-11-08