Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Ruth E. Lofton — 2 Patents

SPShell Western E & P: 2 patents #1 of 35Top 3%
Bakersfield, CA: #242 of 840 inventorsTop 30%
California: #187,151 of 386,348 inventorsTop 50%
Overall (All Time): #1,709,992 of 4,157,543Top 45%
2 Patents All Time
Ruth E. Lofton has been granted 2 US patents while listed as an inventor at Shell Western E & P. All of these patents were granted in 1991. Ruth E. Lofton ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Ruth E. Lofton in Bakersfield, CA, US.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5040470 Steam generating system with NO.sub.x reduction Dale E. Robinson, Daniel H. Hutchinson 1991-08-20
5002484 Method and system for flue gas recirculation Dale E. Robinson, Daniel H. Hutchinson 1991-03-26