Inventor · Mount Airy, MD, US

Robert Kupper

38Patents
10h-index
22Co-inventors
75Inventor score

Filing activity: Oct 21, 1985 → Jun 7, 2023

Most-cited inventions

PatentTitleAreaCited byStatus
US7683072B2 Oxycodone hydrochloride having less than 25 ppm 14-hydroxycodeinone Chemistry; Metallurgy 148 Active
US7674799B2 Oxycodone hydrochloride having less than 25 ppm 14-hydroxycodeinone Chemistry; Metallurgy 142 Active
US7674800B2 Oxycodone hydrochloride having less than 25 PPM 14-hydroxycodeinone Chemistry; Metallurgy 141 Active
US7129248B2 Process for preparing oxycodone hydrochloride having less than 25 ppm 14-hydroxycodeinone Chemistry; Metallurgy 128 Expired
US7939543B2 Method of reducing α, β unsaturated ketones in opioid compositions Human Necessities 55 Active
US7674798B2 Oxycodone hydrochloride having less than 25 ppm 14-hydroxycodeinone Chemistry; Metallurgy 26 Active
US7084150B2 Analogs and prodrugs of buprenorphine Human Necessities 24 Expired
US9073933B2 Oxycodone hydrochloride having less than 25 PPM 14-hydroxycodeinone Chemistry; Metallurgy 16 Active
US6958398B1 Methods for making thebaine or its acid salts Chemistry; Metallurgy 15 Expired
US4710583A Dipeptides and process Chemistry; Metallurgy 14 Expired
US4801742A N-formylation of amino carboxylates with alkyl formates Chemistry; Metallurgy 7 Expired
US8822687B2 8a,14-dihydroxy-7,8-dihydrocodeinone Chemistry; Metallurgy 6 Active
US10407434B2 Process for preparing oxycodone compositions Chemistry; Metallurgy 6 Active
US4873359A Process for preparing as partyl-phenylalanine dipeptides Chemistry; Metallurgy 6 Expired
US9522919B2 Oxycodone compositions Chemistry; Metallurgy 4 Active
US10696684B2 Process for preparing oxycodone hydrochloride having less than 25 PPM 14-hydroxycodeinone Chemistry; Metallurgy 4 Active
US10689389B2 Process for preparing oxycodone compositions Chemistry; Metallurgy 4 Active
US4810817A Aspartyl-beta substituted phenylalanine dipeptides Chemistry; Metallurgy 3 Expired
US11236098B2 Process for preparing oxycodone hydrochloride having less than 25 ppm 14-hydroxycodeinone Chemistry; Metallurgy 2 Active
US11091496B2 Opioid ketal compounds and uses thereof Chemistry; Metallurgy 2 Active
US9777011B2 Process for preparing oxycodone compositions Chemistry; Metallurgy 2 Active
US4855455A Preparation of amino acid derivatives Chemistry; Metallurgy 2 Expired
US4851588A Novel process for the preparation of bronopol Chemistry; Metallurgy 2 Expired
US6649783B2 Synthesis of (+/-)-2-((dimethylamino)methyl)-1-(aryl)cyclohexanols Chemistry; Metallurgy 2 Expired
US4820881A Decolorization Emerging Cross-Sectional Technologies 1 Expired

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