Stephen D. Challis — 2 Patents at ExxonMobil

Stephen D. Challis has been granted 2 US patents while listed as an inventor at ExxonMobil. The first was granted in 1992 and the most recent in December 1998. Stephen D. Challis ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Stephen D. Challis in Fetcham, GB.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
5846403	Recracking of cat naphtha for maximizing light olefins yields	George A. Swan, III	1998-12-08	$235,757,000
5173175	FCC feed injector	Todd R. Steffens	1992-12-22	$68,250,000

Stephen D. Challis — 2 Patents

Issued Patents All Time

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