Inventor · Lohr am Main, DE

Helmut Pieper

84Patents
21h-index
61Co-inventors
91Inventor score

Filing activity: Apr 5, 1974 → Apr 29, 2004

Most-cited inventions

PatentTitleAreaCited byStatus
US5817677A 5-membered heterocycles, medicaments containing these compounds, their use and processes for their preparation Chemistry; Metallurgy 159 Expired
US5463071A 5-membered heterocyclic compounds, processes for preparing them and pharmaceutical compositions containing these compounds Chemistry; Metallurgy 85 Expired
US4882736A Method for efficiently using flue gas energy in a glass furnace Emerging Cross-Sectional Technologies 78 Expired
US6344449B1 Modified aminoacids, pharmaceuticals containing these compounds and method for their production Emerging Cross-Sectional Technologies 73 Expired
US5442064A Carboxylic acid derivatives, pharmaceutical compositions containing these compounds and processes for preparing them Chemistry; Metallurgy 72 Expired
US5434150A Condensed 5-membered heterocyclic compounds, processes for preparing them and pharmaceutical preparations containing these compounds Chemistry; Metallurgy 70 Expired
US6154481A Method of operation of a glass melting furnace and a glass melting furnace for the practice of the method Chemistry; Metallurgy 66 Expired
US6085551A Method and apparatus for manufacturing high melting point glasses with volatile components Chemistry; Metallurgy 65 Expired
US5541343A Cyclic imino derivatives and pharmaceutical compositions containing them Chemistry; Metallurgy 64 Expired
US5519036A Cyclic derivatives pharmaceutical compositions containing these compounds and processes for preparing them Chemistry; Metallurgy 59 Expired
US5276049A Cyclic urea derivatives, pharmaceutical compositions containing these compounds and methods of using the same Chemistry; Metallurgy 52 Expired
US4910200A Acrylic acid morpholides, fungicidal compositions and use Chemistry; Metallurgy 38 Expired
US4932035A Discontinuous glass melting furnace Emerging Cross-Sectional Technologies 37 Expired
US5455348A 2-pyrrolidinones, pharmaceutical compositions containing these compounds and processes for preparing them Chemistry; Metallurgy 31 Expired
US4753934A Acrylic acid heterocyclic amides, fungicidal compositions and use Chemistry; Metallurgy 28 Expired
US5418233A Heterobiarly derivatives and pharmaceutical compositions thereof Chemistry; Metallurgy 26 Expired
US4119710A Bronchospasmolytic 1-(p-amino-phenyl)-2-amino-ethanols-(1) and salts Chemistry; Metallurgy 26 Expired
US4093734A Amino-benzoic acid amides Chemistry; Metallurgy 25 Expired
US5591769A Cyclic imino derivatives and pharmaceutical compositions containing them Chemistry; Metallurgy 25 Expired
US4944785A Process using melt accelerator for the conversion of solid waste substances into glass Emerging Cross-Sectional Technologies 23 Expired
US3942968A Method and apparatus for melting and subsequently refining glass Chemistry; Metallurgy 21 Expired
US7498325B2 Modified amino acids, pharmaceuticals containing these compounds and method for their production Physics 19 Expired
US5994356A Carboxylic acid derivatives, medicaments comprising these compounds, their use and processes for their production Chemistry; Metallurgy 19 Expired
US4490369A Benzazepine derivatives, their pharmaceutical compositions and method of use Chemistry; Metallurgy 19 Expired
US5922717A Piperazine derivatives, medicaments comprising these compounds, their use and processes for their preparation Chemistry; Metallurgy 17 Expired

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.