Inventor · Hürth, DE

Norbert Weferling

37Patents
13h-index
23Co-inventors
81Inventor score

Filing activity: Sep 14, 1983 → Sep 29, 2006

Most-cited inventions

PatentTitleAreaCited byStatus
US6355832B1 Processing for preparing salts of dialkylphosphinic acids Chemistry; Metallurgy 43 Expired
US6090968A Process for preparing phosphinic esters Chemistry; Metallurgy 32 Expired
US6569974B1 Polymeric phosphinic acids and salts thereof Chemistry; Metallurgy 29 Expired
US5166452A Process for inhibiting and destroying peroxides in dialkyl ethers Chemistry; Metallurgy 28 Expired
US6727335B2 Polymeric phosphinic acids and salts thereof Chemistry; Metallurgy 26 Expired
US7446140B2 Dialkylphosphinic salts, their use, and a process for their preparation Chemistry; Metallurgy 25 Active
US6534673B1 Process for preparing salts of dialkylphosphinic acids Chemistry; Metallurgy 20 Expired
US6278012A Process for preparing phosphinate esters Chemistry; Metallurgy 18 Expired
US6300516A Process for preparing dialkylphosphinic acids Chemistry; Metallurgy 16 Expired
US6329544A Process for preparing dialkylphosphinic acids Chemistry; Metallurgy 15 Expired
US6359171B1 Process for preparing dialkylphosphinic acids and their salts Chemistry; Metallurgy 14 Expired
US7420007B2 Dialkylphosphinic salts Chemistry; Metallurgy 14 Expired
US5973194A Process for preparing dialkylphosphinate salts Chemistry; Metallurgy 13 Expired
US6583315B2 Process for preparing ethanebis(alkylphosphinic) acids Chemistry; Metallurgy 10 Expired
US5925785A Secondary and tertiary phosphines and processes for their preparation Chemistry; Metallurgy 10 Expired
US6011172A Process for alkylating elemental phosphorus Chemistry; Metallurgy 8 Expired
US6090967A Process for preparing phosphonous esters Chemistry; Metallurgy 7 Expired
US7635785B2 Process for preparation of dialkylphosphinic salts Chemistry; Metallurgy 6 Expired
US6420598B1 Process for preparing alkylphosphonic acids Chemistry; Metallurgy 5 Expired
US6232493A Process for preparing metal salts of arylalkylphosphinic acids Chemistry; Metallurgy 5 Expired
US6242642A Process for preparing arylalphosphinic acids Chemistry; Metallurgy 5 Expired
US5002914A Process for purifying and recovering the contaminated catalyst solution arising in the carbonylation of methanol and/or methyl acetate and/or dimethyl ether Emerging Cross-Sectional Technologies 3 Expired
US4752648A Process for making chlorophosphines and thiophosphinic acid chlorides, and 9-chloro-9-thioxo-9-phosphabicyclononanes Chemistry; Metallurgy 3 Expired
US6815558B1 Process for preparing (metal) alkylphosphonites II Chemistry; Metallurgy 3 Expired
US5268479A Process for the preparation of tertiary phosphines Chemistry; Metallurgy 3 Expired

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