Johannes E. Schmidt has been granted 8 US patents while listed as an inventor at Basf Se . The first was granted in 1980 and the most recent in July 1993. Johannes E. Schmidt ranks #600,572 of 4,157,543 US inventors in our database (top 14.4%). Patent records list Johannes E. Schmidt in Ludwigshafen, DE.
Patents per Year Patents granted per year, 1980 to 1993 Bar chart with a peak of 2 patents in 1980. peak 2 1980: 2 patents 1980 1983: 1 patents 1983 1986: 1 patents 1986 1990: 2 patents 1990 1993: 2 patents 1993
Issued Patents All Time
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Showing 1–8 of 8 patents
Patent # Title Co-Inventors Date
5225574 Preparation of phthalic anhydride from o-xylene Heinrich Aichinger , Wilhelm Ruppel , Rolf Seubert , Karl-Heinz Boehning , Walter Scheidmeir +1 more 1993-07-06
5206433 Preparation of formic acid Heinz Hohenschutz , Hans Kiefer 1993-04-27
4961827 Obtaining very pure maleic anhydride from crude maleic anhydride Dieter Zimmerling , Rolf Seubert , Karl Fischer , Friedrich Sauer 1990-10-09
4921977 Obtaining maleic anhydride not prone to discolor Gerhard Michl , Rolf Seubert 1990-05-01
4568427 Continuous isolation of phthalic anhydride and maleic anhydride from reaction gases Eckehard Danz , Gerd Dumbgen , Ernest Miesen , Friedrich Wirth 1986-02-04
4369327 Preparation of phthalic anhydride Dieter Stockburger , Wilhelm Schultz , Friedrich Wirth , Herwig Hoffmann , Bernhard Holzknecht +1 more 1983-01-18
4218568 Preparation of formic acid Heinz Hohenschutz , Hans Kiefer 1980-08-19
4217460 Isolation of formic acid from its aqueous solutions Heinz Hohenschutz , Hans Kiefer 1980-08-12
