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

Darrell W. Walker — 23 Patents

PPPhillips Petroleum: 14 patents #156 of 2,260Top 7%
S(Sun Company, Inc. (R&M): 7 patents #7 of 33Top 25%
SMSun Refining And Marketing: 2 patents #13 of 30Top 45%
Bartlesville, OK: #88 of 1,143 inventorsTop 8%
Oklahoma: #352 of 12,736 inventorsTop 3%
Overall (All Time): #178,160 of 4,157,543Top 5%
23 Patents All Time
Darrell W. Walker has been granted 23 US patents while listed as an inventor at Phillips Petroleum. The first was granted in 1980 and the most recent in March 1998. Darrell W. Walker ranks #178,160 of 4,157,543 US inventors in our database (top 4.3%). Patent records list Darrell W. Walker in Bartlesville, OK, US.

Issued Patents All Time

Showing 1–23 of 23 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
5733518 Process and catalyst for dehydrogenation of organic compounds Vincent A. Durante, Daniel E. Resasco, Gary L. Haller, Eugene L. Coggins 1998-03-31 $21,644,000
5439859 Process and catalyst for dehydrogenation of organic compounds Vincent A. Durante, Daniel E. Resasco, Gary L. Haller, Eugene L. Coggins 1995-08-08 $11,604,000
5414157 Catalytic oxidation of alkanes Vincent A. Durante, Steven M. Gussow, James E. Lyons, Robert Chastain Hayes 1995-05-09 $20,165,000
5386074 Catalytic dehydrogenation of alkanes Vincent A. Durante, James E. Lyons 1995-01-31 $17,929,000
5345011 New manganese catalyst for light alkane oxidation Vincent A. Durante, James E. Lyons, Bonita K. Marcus 1994-09-06 $5,773,000
5345010 Chromia on metal oxide for the oxidation of alkane to alcohol James E. Lyons, Vincent A. Durante 1994-09-06 $5,773,000
5220080 Chromia on metal oxide catalysts for the oxidation of methane to methanol James E. Lyons, Vincent A. Durante 1993-06-15 $14,995,000
5132472 Catalytic oxidation of alkanes Vincent A. Durante, Steven M. Gussow, James E. Lyons, Robert Chastain Hayes 1992-07-21 $16,259,000
4918249 Silicometallate molecular sieves and their use as catalysts in oxidation of alkanes Vincent A. Durante, Steven M. Gussow, James E. Lyons 1990-04-17 $5,994,000
4873211 Cracking catalyst and process A. M. Schaffer 1989-10-10 $44,108,000
4846960 Catalytic cracking Fu-Ming Lee 1989-07-11 $37,457,000
4793914 Passivation of metal contaminated cracking catalysts Brent J. Bertus 1988-12-27 $7,655,000
4794095 Catalytic cracking catalyst Fu-Ming Lee 1988-12-27 $7,655,000
4765884 Cracking catalyst and process Arnold M. Schaffer 1988-08-23 $11,505,000
4727053 Passivation of metal contaminated cracking catalysts Brent J. Bertus 1988-02-23 $4,168,000
4484015 Selective hydrogenation Marvin M. Johnson, Gerhard P. Nowack 1984-11-20 $6,232,000
4404124 Selective hydrogenation catalyst Marvin M. Johnson, Gerhard P. Nowack 1983-09-13 $5,961,000
4370310 Zinc aluminate prepared using an alumina hydrate 1983-01-25 $2,620,000
4263133 Catalytic reforming and hydrocracking of organic compounds employing zinc titanate as the catalytic agent Lewis E. Drehman, Floyd E. Farha, Jr. 1981-04-21 $4,482,000
4252680 Oxidative dehydrogenation catalyst preparation Floyd E. Farha, Jr. 1981-02-24 $17,562,000
4228040 Lithium- or magnesium-promoted zinc titanate catalyst for dehydrogenation of hydrocarbons Brent J. Bertus 1980-10-14 $27,421,000
4218343 Dehydrogenation of organic compounds Robert J. Hogan, Floyd E. Farha, Jr. 1980-08-19 $5,968,000
4218346 Zinc titanate catalyst for dehydrogenation of hydrocarbons Floyd E. Farha, Jr. 1980-08-19 $5,968,000