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USPTO Patent Rankings Data through Dec 31, 2025
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Pei-Shing E. Dai — 58 Patents

Chevron: 49 patents #48 of 4,788Top 2%
HCHuntsman Specialty Chemicals: 4 patents #4 of 28Top 15%
AGAbb Lummus Global: 3 patents #23 of 152Top 20%
Port Arthur, TX: #1 of 77 inventorsTop 2%
Texas: #1,333 of 125,132 inventorsTop 2%
Overall (All Time): #41,319 of 4,157,543Top 1%
58 Patents All Time
Pei-Shing E. Dai has been granted 58 US patents while listed as an inventor at Chevron. The first was granted in 1990 and the most recent in May 2002. Pei-Shing E. Dai ranks #41,319 of 4,157,543 US inventors in our database (top 0.99%). Patent records list Pei-Shing E. Dai in Port Arthur, TX, US.

Issued Patents All Time

Showing 1–25 of 58 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
6387248 Method of preparing a catalyst for use in the hydrotreating of high boiling hydrocarbon feedstocks David E. Sherwood, Jr. 2002-05-14
5972205 FCC process using binary molecular sieves having a core and shell of different structures and compositions Chih-Hao M. Tsang, Randall H. Petty 1999-10-26
5928499 Hydroconversion process employing catalyst with specified pore size distribution, median pore diameter by surface area, and pore mode by volume David E. Sherwood, Jr. 1999-07-27 $93,660,000
5888921 Binary molecular sieves having a core and shell of different structures and compositions Chih-Hao M. Tsang, Randall H. Petty 1999-03-30 $770,000
5856588 Two-stage etherification of tertiary butyl alcohol using second stage zeolite catalysts for the intermediate preparation of isobutylene John F. Knifton 1999-01-05
5792890 Method for the purification of tertiary butyl alcohol for use in the manufacture of methyl tertiary butyl ether Laurence D. Neff, Kyle Preston, Rei-Yu J. Hwan, John F. Knifton 1998-08-11
5756789 Synthesis of metal--containing aluminophosphates with layered structure David A. Bruce, Mark G. White, Joseph Aaron Bertrand, Randall H. Petty 1998-05-26 $81,130,000
5744652 Method for the manufacture of methyl tertiary butyl ether from tertiary butyl alcohol and methanol Laurence D. Neff, Kyle Preston, Rei-Yu J. Hwan 1998-04-28
5723698 Catalytic decomposition of formate impurities in tertiary butyl alcohol and methyl tertiary butyl ether streams Laurence D. Neff, Kyle Preston, Rei-Yu J. Hwan 1998-03-03
5716896 One-step synthesis of methyl t-butyl ether from t-butanol using .beta.-zeolite catalysts modified with lithium plus rare earths John F. Knifton 1998-02-10
5690810 Single-step process to upgrade naphthas to an improved gasoline blending stock Richard Vance Lawrence 1997-11-25 $133,078,000
5637778 Isopropyl alcohol and diispropyl ether production from crude by-product acetone in one step Robert J. Taylor, Jr., John F. Knifton, Bobby R. Martin 1997-06-10 $143,724,000
5616530 Hydroconversion process employing catalyst with specified pore size distribution David E. Sherwood, Jr., Charles N. Campbell, II 1997-04-01 $41,111,000
5583266 Integrated process for the production of isopropyl alcohol and diisopropyl ethers Robert J. Taylor, Jr., John F. Knifton 1996-12-10 $123,559,000
5549813 FCC process employing low unit cell size y-zeolites Chih-Hao M. Tsang, Laurence D. Neff, Randall H. Petty 1996-08-27
5550300 Gradient catalyst system for the integrated production of isopropyl alcohol and diisopropyl ethers Robert J. Taylor, Jr., John F. Knifton 1996-08-27 $47,772,000
5545602 Catalyst with specified pore size distribution Gerald V. Nelson, Govanon Nongbri, Roy E. Pratt, David E. Sherwood, Jr. 1996-08-13 $23,547,000
5534135 Synthesis of zeolites David E. Sherwood, Jr., Burton H. Bartley 1996-07-09 $657,000
5514273 Hydroconversion process employing catalyst with specified pore size distribution David E. Sherwood, Jr., Charles N. Campbell, II 1996-05-07 $41,331,000
5498586 Catalyst with specified pore size distribution David E. Sherwood, Jr. 1996-03-12 $29,764,000
5488179 Ditertiary butyl peroxide preparation from tertiary butyl hydroperoxide John F. Knifton, Edward T. Marquis 1996-01-30 $38,828,000
5488178 Ditertiary butyl peroxide preparation from tertiary butyl hydroperoxide John F. Knifton, Edward T. Marquis 1996-01-30 $38,828,000
5476972 Isopropyl alcohol and ether production from crude by-product acetone Robert J. Taylor, Jr., John F. Knifton, Bobby R. Martin 1995-12-19 $34,823,000
5472594 FCC process for producing enhanced yields of C.sub.4 /C.sub.5 olefins Chih-Hao M. Tsang, Laurence D. Neff 1995-12-05 $18,821,000
5459118 Hydrotalcite-containing catalyst composition David E. Sherwood, Jr., Randall H. Petty 1995-10-17 $28,436,000