John E. Gwyn has been granted 10 US patents while listed as an inventor at Shell Oil Compny . The first was granted in 1981 and the most recent in October 1994. John E. Gwyn ranks #481,000 of 4,157,543 US inventors in our database (top 11.6%). Patent records list John E. Gwyn in Katy, TX, US.
Patents per Year Patents granted per year, 1981 to 1994 Bar chart with a peak of 2 patents in 1981. peak 2 1981: 2 patents 1981 1982: 1 patents 1982 1983: 1 patents 1983 1984: 1 patents 1984 1987: 1 patents 1987 1988: 2 patents 1988 1993: 1 patents 1993 1994: 1 patents 1994
Issued Patents All Time
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Showing 1–10 of 10 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
5351482 Method of maintaining catalytic converter activity in gasoline vehicles — 1994-10-04
5234477 Method of reducing NO.sub.x emissions in gasoline vehicles — 1993-08-10
4755282 Process for the reduction of NH.sub.3 in regeneration zone off gas by select recycle of certain-sized NH.sub.3 decomposition catalysts Norman C. Samish 1988-07-05
4731228 Reactor and horizontal cyclone separator with primary mass flow and secondary centrifugal separation of solid and fluid phases Thomas S. Dewitz , Wesley A. Parker , Donald E. Hardesty 1988-03-15
4692311 Apparatus for the separation of fluid cracking catalyst particles from gaseous hydrocarbons Wesley A. Parker , Thomas S. Dewitz , George P. Hinds, Jr. , A. Haluk Bilgic , Donald E. Hardesty 1987-09-08
4455220 Separation of fluid cracking catalyst particles from gaseous hydrocarbons Wesley A. Parker , Thomas S. Dewitz , George P. Hinds, Jr. , A. Haluk Bilgic , Donald E. Hardesty 1984-06-19
$26,852,000
4405440 Process for maintaining the temperature of a steam-making effluent above the dew point — 1983-09-20
$13,134,000
4320795 Process for heat transfer with dilute phase fluidized bed Scott C. Roberts 1982-03-23
$39,974,000
4279733 Coking prevention — 1981-07-21
$14,298,000
4279734 Quench Process — 1981-07-21
$14,298,000
