Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Catherine L. Markham — 6 Patents

ExxonMobil: 6 patents #1,830 of 10,161Top 20%
Thornton, PA: #5 of 27 inventorsTop 20%
Pennsylvania: #13,718 of 74,527 inventorsTop 20%
Overall (All Time): #779,687 of 4,157,543Top 20%
6 Patents All Time
Catherine L. Markham has been granted 6 US patents while listed as an inventor at ExxonMobil. The first was granted in 1990 and the most recent in May 1994. Catherine L. Markham ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list Catherine L. Markham in Thornton, PA, US.

Patents per Year

Patents granted per year, 1990 to 1994Bar chart with a peak of 2 patents in 1990.peak 21990: 2 patents19901991: 1 patents19911992: 1 patents19921994: 2 patents1994

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
5308473 Low NO.sub.x FCC regeneration process and apparatus Gregory P. Muldowney 1994-05-03 $20,401,000
5288397 Baffled FCC regeneration process and apparatus Gregory P. Muldowney 1994-02-22 $11,649,000
5130012 Process and apparatus for reducing NO.sub.x emissions from high-efficiency FFC regenerators Michael S. Edwards, David A. Land, Joseph R. Misiewicz, John P. Schields 1992-07-14 $24,898,000
5073349 High efficiency catalytic cracking stripping apparatus Joseph A. Herbst, Ajit V. Sapre, Gerald J. Teitman 1991-12-17 $13,225,000
4968403 High efficiency catalytic cracking stripping process Joseph A. Herbst, Ajit V. Sapre, Gerald J. Teitman 1990-11-06 $12,623,000
4906353 Dual mode hydrocarbon conversion process Lloyd L. Breckenridge 1990-03-06 $8,430,000