Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
DD

David C. Dankworth — 15 Patents

ExxonMobil: 15 patents #742 of 10,161Top 8%
Princeton, NJ: #295 of 2,186 inventorsTop 15%
New Jersey: #5,772 of 69,400 inventorsTop 9%
Overall (All Time): #307,048 of 4,157,543Top 8%
15 Patents All Time
David C. Dankworth has been granted 15 US patents while listed as an inventor at ExxonMobil. The first was granted in 1994 and the most recent in October 2025. David C. Dankworth ranks #307,048 of 4,157,543 US inventors in our database (top 7.4%). Patent records list David C. Dankworth in Princeton, NJ, US.

Patents per Year

Patents granted per year, 1994 to 2025Bar chart with a peak of 4 patents in 1999.peak 41994: 1 patents19941995: 1 patents19951999: 4 patents19992000: 1 patents20002003: 1 patents20032005: 1 patents20052019: 1 patents20192023: 3 patents20232025: 2 patents2025

Issued Patents All Time

Showing 1–15 of 15 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
12441941 Upgrading pyrolysis carbon Guang Ping Cao, James R. Bielenberg, August W. Bosse, Sumathy Raman, Michael Siskin 2025-10-14
12358788 Methane pyrolysis using stacked fluidized beds Ramesh Gupta, Hugo S. Caram, Anjaneya S. Kovvali, Sumathy Raman 2025-07-15
11629056 Reactor for carbon nanotube and nanofiber production Ramesh Gupta, Sumathy Raman, Amrit Jalan, Hugo S. Caram 2023-04-18 $572,891,000
11591212 Systems and processes for molten media pyrolysis Ramesh Gupta, Sumathy Raman, Hugo S. Caram 2023-02-28 $617,915,000
11577955 Systems and processes for molten media pyrolysis Ramesh Gupta, Sumathy Raman, Hugo S. Caram 2023-02-14 $771,208,000
10414991 Processing of heavy hydrocarbon feeds Benjamin S. Umansky, Himanshu Gupta, John D. NELSON, Cindy J. HUGHART, Jane C. Cheng +11 more 2019-09-17 $90,008,000
6846469 Method for extending operating life of a fixed bed reactor Ramesh Gupta, Salvatore J. Rossetti, Jeffrey L. Kaufman, David L. Vannauker, James P. Bailor 2005-01-25 $106,404,000
6623621 Control of flooding in a countercurrent flow reactor by use of temperature of liquid product stream Larry L. Iaccino, Russell D. Sellen, Edward S. Ellis, Jeffrey W. Frederick, Ramesh Gupta +2 more 2003-09-23 $123,175,000
6054041 Three stage cocurrent liquid and vapor hydroprocessing Edward S. Ellis, William E. Lewis, Ramesh Gupta 2000-04-25 $449,694,000
6007787 Countercurrent reaction vessel Ramesh Gupta, Dennis D. Fleming, Edward S. Ellis, James J. Schorfheide 1999-12-28 $179,508,000
5985131 Hydroprocessing in a countercurrent reaction vessel Ramesh Gupta, Dennis D. Fleming, Edward S. Ellis, James J. Schorfheide 1999-11-16 $260,048,000
5942197 Countercurrent reactor Ramesh Gupta, Jeffrey W. Frederick, Edward S. Ellis, Dimitrios M. Tsangaris 1999-08-24 $198,741,000
5939031 Countercurrent reactor Edward S. Ellis, Jeffrey W. Frederick, Ramesh Gupta, Dimitrios M. Tsangaris 1999-08-17 $366,594,000
5403561 Mixed phase fixed bed reactor distributor Robert M. Koros, Yiu W. Wong, John T. Wyatt 1995-04-04 $74,129,000
5354990 In-situ localized tracer injection/fiber optic detection for measurement of flow distributions in fixed bed reactors Robert M. Koros 1994-10-11 $43,690,000