Marshall E. Johns — 1 Patent at Petrolite

Marshall E. Johns has been granted 1 US patent while listed as an inventor at Petrolite. All of these patents were granted in 1986. Marshall E. Johns ranks #2,406,284 of 4,157,543 US inventors in our database (top 57.9%). Patent records list Marshall E. Johns in Creve Coeur, MO, US.

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
4631138	Corrosion inhibitors	Keith D. Strassner, Thomas G. Braga	1986-12-23	$1,822,000

Marshall E. Johns — 1 Patent

Issued Patents All Time

Patent Widget