{"@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [{"@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.patentleaderboard.com/"}, {"@type": "ListItem", "position": 2, "name": "Inventors", "item": "https://www.patentleaderboard.com/inventors"}, {"@type": "ListItem", "position": 3, "name": "Alfred E. Keller", "item": "https://www.patentleaderboard.com/inventor/fl:al_ln:keller-5"}]}
Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
AK

Alfred E. Keller — 44 Patents

PPPhillips Petroleum: 24 patents #77 of 2,506Top 4%
COConoco: 8 patents #29 of 638Top 5%
EMEduard Kusters Maschinefabrik: 5 patents #9 of 61Top 15%
WKWeitmann & Konrad Gmbh & Co. Kg: 3 patents #3 of 19Top 20%
CCCiba Specialty Chemicals: 1 patents #701 of 1,233Top 60%
GSGivaudan Sa: 1 patents #219 of 78Top 285%
Katy, TX: #33 of 2,042 inventorsTop 2%
Texas: #2,145 of 125,132 inventorsTop 2%
Overall (All Time): #66,838 of 4,157,543Top 2%
44 Patents All Time
Alfred E. Keller has been granted 44 US patents. The first was granted in 1980 and the most recent in October 2017. Alfred E. Keller ranks #66,838 of 4,157,543 US inventors in our database (top 1.6%). Patent records list Alfred E. Keller in Katy, TX, US.

Patents per Year

Patents granted per year, 1980 to 2017Bar chart with a peak of 4 patents in 1991.peak 41980: 1 patents19801987: 1 patents1990: 1 patents1991: 4 patents19911992: 2 patents1993: 1 patents1994: 2 patents19941995: 1 patents1996: 1 patents1997: 1 patents19971999: 2 patents2001: 1 patents2002: 1 patents20022003: 1 patents2004: 2 patents2005: 2 patents20052006: 4 patents2007: 1 patents2008: 2 patents20082009: 3 patents2010: 1 patents2011: 2 patents20112015: 3 patents2017: 4 patents2017

Issued Patents All Time

Showing 1–25 of 44 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
9789433 Apparatus for in-situ production of low dissolved hydrogen sulfide, degassed, sulfur from Claus sulfur recovery 2017-10-17 $74,757,000
9757677 Apparatus for in-situ production of low dissolved hydrogen sulfide, degassed, sulfur from Claus sulfur recovery 2017-09-12 $48,299,000
9758376 Process for degassing condensed sulfur from a Claus sulfur recovery system 2017-09-12 $48,299,000
9573081 Process for degassing condensed sulfur from a claus sulfur recovery system 2017-02-21 $78,133,000
9205364 Process for in-situ production of low dissolved hydrogen sulfide, degassed, sulfur from Claus sulfur recovery 2015-12-08 $247,348,000
9192887 Process for in-situ production of low dissolved hydrogen sulfide, degassed, sulfur from claus sulfur recovery 2015-11-24 $136,099,000
9138675 Process for degassing condensed sulfur from a claus sulfur recovery system 2015-09-22 $250,448,000
8075866 Sulfur degassing process Nathan A. Hatcher, Sriram Ramani, Terry D. Pruitt, Michael D. Smith 2011-12-13 $341,478,000
7998451 Sulfur degassing process Nathan A. Hatcher, Sriram Ramani, Terry D. Pruitt, Michael D. Smith 2011-08-16 $174,176,000
7658906 Sulfur recovery plant Nathan A. Hatcher, Sriram Ramani, Larry D. Swinney 2010-02-09 $172,404,000
7560088 Compact sulfur recovery plant and process Sriram Ramani, Nathan A. Hatcher, Joe D. Allison, Steven E. Lusk, Larry D. Swinney +4 more 2009-07-14 $499,001,000
7550033 Process for removing sulfides Samuel Henry Beuke, Richard D. Sadok 2009-06-23 $253,484,000
7501111 Increased capacity sulfur recovery plant and process for recovering elemental sulfur Sriram Ramani, Joe D. Allison, Steven E. Lusk, Nathan A. Hatcher, Larry D. Swinney +1 more 2009-03-10 $393,301,000
7357908 Apparatus and catalytic partial oxidation process for recovering sulfur from an H2S-containing gas stream Sriram Ramani 2008-04-15 $588,264,000
7326397 Catalytic partial oxidation process for recovering sulfur from an H2S-containing gas stream Sriram Ramani, Devadas Panjala 2008-02-05 $495,076,000
7226572 Compact sulfur recovery plant and process Sriram Ramani, Joe D. Allison, Steven E. Lusk, Nathan A. Hatcher, Larry D. Swinney +4 more 2007-06-05 $329,869,000
7138101 Two-stage catalytic process for recovering sulfur from an H2S-containing gas stream Sriram Ramani 2006-11-21 $304,079,000
7122170 Catalysts for SPOC™ enhanced synthesis gas production Sriram Ramani 2006-10-17 $612,454,000
7108842 Process for the catalytic partial oxidation of H2S using staged addition of oxygen Sriram Ramani 2006-09-19 $195,528,000
7041621 Sulfided catalysts for improved performance in hydrocarbon processing Sriram Ramani, Joe D. Allison, Zhen Chen 2006-05-09 $213,491,000
6946111 Short contact time catalytic partial oxidation process for recovering sulfur from an H2S containing gas stream Joe D. Allison, Sriram Ramani, Terry D. Pruitt 2005-09-20 $183,785,000
6881394 Steam reformer for methane with internal hydrogen separation and combustion 2005-04-19 $361,515,000
6800269 Short contact time catalytic sulfur recovery system for removing H2S from a waste gas stream Sriram Ramani, Joe D. Allison, Terry D. Pruitt 2004-10-05 $130,364,000
6773691 Controlling syngas H2:CO ratio by controlling feed hydrocarbon composition Sriram Ramani, Joe D. Allison 2004-08-10 $176,076,000
6579510 SPOX-enhanced process for production of synthesis gas Joe D. Allison, Sriram Ramani 2003-06-17