John B. Covington has been granted 7 US patents while listed as an inventor at 3M . The first was granted in 1981 and the most recent in December 1992. John B. Covington ranks #680,018 of 4,157,543 US inventors in our database (top 16.4%). Patent records list John B. Covington in Maplewood, MN, US.
Patents per Year Patents granted per year, 1981 to 1992 Bar chart with a peak of 2 patents in 1981. peak 2 1981: 2 patents 1981 1982: 1 patents 1982 1989: 1 patents 1989 1990: 1 patents 1990 1991: 1 patents 1991 1992: 1 patents 1992
Issued Patents All Time
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Showing 1–7 of 7 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
5173390 Water soluble contrast enhancement composition and method of use Vic B. Marriott , Larry G. Venable , Peter Kim 1992-12-22
$3,532,000
4997742 Water soluble contrast enhancement composition with 1-oxy-2 diazonaphthalene sulfonamide salt and polyvinyl alcohol Vic B. Marriott , Larry G. Venable , Peter Kim 1991-03-05
$5,116,000
4959293 Deep UV photoresist with alkyl 2-diazo-1-ones as solubility modification agents George Schwartzkopf , Kathleen Gabriel 1990-09-25
$27,426,000
4816380 Water soluble contrast enhancement layer method of forming resist image on semiconductor chip Vic B. Marriott , Larry G. Venable , Peter Kim 1989-03-28
$2,218,000
4323591 Irradiation of polyacrylate films in air Larry A. Wendling 1982-04-06
$3,510,000
4306954 Process for polymerizing acrylic substituted hydantoins in air Larry A. Wendling 1981-12-22
$3,270,000
4262072 Poly(ethylenically unsaturated alkoxy) heterocyclic protective coatings Larry A. Wendling 1981-04-14
$3,864,000
