Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
HS

Hardo Siegel — 53 Patents

Basf Se: 52 patents #129 of 13,826Top 1%
BABasen: 1 patents #8 of 27Top 30%
Speyer, DE: #5 of 320 inventorsTop 2%
Overall (All Time): #48,528 of 4,157,543Top 2%
53 Patents All Time
Hardo Siegel has been granted 53 US patents while listed as an inventor at Basf Se. The first was granted in 1980 and the most recent in October 2000. Hardo Siegel ranks #48,528 of 4,157,543 US inventors in our database (top 1.2%). Patent records list Hardo Siegel in Speyer, DE.

Patents per Year

Patents granted per year, 1980 to 2000Bar chart with a peak of 5 patents in 1988.peak 51980: 3 patents19801981: 2 patents1982: 4 patents19821983: 3 patents1984: 1 patents19841985: 2 patents1987: 3 patents19871988: 5 patents1989: 3 patents19891990: 5 patents1992: 5 patents19921993: 5 patents1994: 2 patents19941996: 4 patents1999: 3 patents19992000: 3 patents2000

Issued Patents All Time

Showing 1–25 of 53 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
6140428 Simultaneous production of dicarboxylic acids and diamines by splitting polyamides into their monomeric constituents Ursula Seeliger, Wolfgang Mueller, Frank Heimann, Guenther Huber, Wolfgang Habermann +1 more 2000-10-31 $249,000
6013803 Sterically hindered 4-amino-piperidine with a low dimer content, its production and use Manfred Julius, Harald Rust, Alfred Krause, Wolfgang Siegel, Tom Witzel 2000-01-11
6011157 Process for purifying sterically hindered 4-amino piperidines Manfred Julius, Harald Rust, Alfred Krause, Wolfgang Siegel, Tom Witzel 2000-01-04
5928912 Process for the hydroxylation of aromatic acids using strains of the fungus Beauveria Wolfgang Ladner, Horst Ralf Staudenmaier, Bernhard Hauer, Ursula Mueller, Uwe Pressler +1 more 1999-07-27
5892121 Purification of tertiary phosphine oxides Dieter Hermeling, Randolf Hugo 1999-04-06
5856494 Preparation of 2, 2, 6, 6-tetramethylpiperidin-4-one (TAA) Manfred Julius, Dieter Hermeling, Wolfgang Harder 1999-01-05
5543515 Preparation of tertiary amine oxides Ulrich Koehler, Guenther Seybold 1996-08-06
5536854 Preparation of 2-methyl-1,4-butanediol and 3-methyltetrahydrofuran Hans-Juergen Weyer, Rolf Fischer, Franz Merger, Juergen Frank, Jochem Henkelmann +1 more 1996-07-16
5527966 Preparation of triphenylphosphine Dieter Hermeling, Peter Bassler, Peter Hammes, Randolf Hugo, Peter Lechtken 1996-06-18
5496958 Preparation of 5-vinylpyrrolidones Rolf Fischer, Werner Hoffmann, Ernst Langguth 1996-03-05
5359082 Preparation of 4-substituted imidazoles from N-formyl-.alpha.-aminonitrile Ulrich Koehler, Thomas-Michael Kahl, Horst Neuhauser, Michael Kroener 1994-10-25
5296363 Preparation of 2-(4-hydroxyphenoxy)propionic acid by fermentation Bryan Cooper, Wolgang Ladner, Bernhard Hauer 1994-03-22
5254711 Continuous preparation of 3-cyano-3,5,5-trimethylcyclohexanone Hans J. Pander, Otto Woerz 1993-10-19
5254738 Preparation of 1,4-alkylenediamines Ulrich Koehler, Matthias Irgang 1993-10-19
5231231 Process for preparing a poly(1,4-butanediol-.omega.,.omega.'-bismercaptan) Ulrich Koehler, Eckhard Hickmann 1993-07-27
5208333 (2R)-1-(aryloxy)-3-(butyryloxy)-2-propanols Axel Paul, Wolfgang Ladner 1993-05-04
5196571 Preparation of unsaturated monoesters Wolfgang Hoelderich 1993-03-23
5136089 Acylation of alkyl aromatic hydrocarbons Jochem Henkelmann 1992-08-04
5132427 Process for the preparation of amines Ulrich Koehler, Peter Jaeger, Matthias Irgang 1992-07-21
5130454 Polytetrahydrofuran derivatives having terminal aromatic groups Eckhard Hickmann, Ulrich Koehler 1992-07-14
5118685 Aminopropanol derivatives of substituted 2-hydroxy-propiophenones, and therapeutic agents containing these compounds Albrecht Franke, Wolfgang Spiegler, Claus Mueller, Gerda von Philipsborn, Dieter Lenke +1 more 1992-06-02
5101045 Preparation of N-substituted pyrrolidones Ulrich Koehler 1992-03-31
4967013 Preparation of hydroxybenzaldehydes Werner Steck, Helmut Lermer, Harald Rust, Gerhard Fritz 1990-10-30
4962231 Preparation of D- or L-alanine or high enantiomeric purity Axel Paul, Peter Tonne, Eckhard Roske 1990-10-09
4914133 Amino compounds and fungicides containing them Walter Himmele, Hubert Sauter, Eberhard Ammermann, Ernst-Heinrich Pommer 1990-04-03