Inventor
Klaus Gehrmann
Inventor
Erftstadt, DE
Overview
Patents· 45 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Cprimary
C07CAcyclic or carbocyclic compounds46%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry16%
C07FAcyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium16%
Y02PClimate change mitigation technologies in the production or processing of goods13%
C01BNon-metallic elements3%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%
C22BProduction and refining of metals1%
PatentTitleYear
5,380,929'Process for the preparation of acetic acid and acetic anhydride'19955,169,982'Process for separating iodine and its compounds from the products obtained on subjecting dimethylether, methyl acetate or methanol to carbonylation'19924,898,966'Process for the preparation of phenylalanine n-propyl ester hydrochloride'19904,892,971'Process for the preparation of n-acetylphenylalanine'19904,746,640'Process for purifying and recovering catalyst solution contaminated during the carbonylation of methyl acetate and/or dimethylether'19884,717,454'Process for removing acetone from reaction mixtures of carbonylation reactions'19884,664,753'Process for separating iodine and its compounds from the carbonylation products obtained by subjecting dimethylether, methyl acetate or methanol to a carbonylation reaction'19874,629,711'Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether'19864,560,518'Process for the continuous production of 2-carboxyethyl-alkyl-phosphinic acid dialkylesters'19854,557,760'Process for recovering noble metals belonging to group VIII of the Periodic System of the elements from a contaminated catalyst solution originating from the carbonylation of methyl acetate and/or dimethylether'19854,556,644'Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether'19854,549,937'Process for separating the catalyst system from the reaction mixtures of carbonylation reactions'19854,549,995'Process for making alkanephosphonous acid esters'19854,543,217'Process for making carboxylic acid halides'19854,518,538'Process for making methyldichlorophosphane'19854,444,624'Process for separating acetone from carbonylation mixtures'19844,442,304'Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether'19844,440,570'Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether'19844,430,273'Production of acetic anhydride'19844,414,160'Process for making carboxylic acid halides'19834,352,761'Production of acetyl chloride'19824,351,972'Process for making anhydrous alkyl iodides'19824,333,884'Production of acetic anhydride'19824,318,865'Production of 2-chloroformylethylmethylphosphinic acid chlorides'19824,319,038'Production of 1,1-diacetoxyethane'19824,308,175'Carrier-supported catalyst and process for making it'19814,280,010'Continuous production of alkyl acrylates free from ether'19814,261,923'Process permitting the deposition of solid matter in mixtures containing methyldichlorophosphane to be inhibited'19814,260,520'Carrier-supported catalyst and process for making it'19814,252,983'Production of acetic anhydride and acetic acid from acetaldehyde'19814,209,460'Production of pure acetyl chloride'19804,206,078'Production of space abrasion-resistant active carbon carriers or catalysts'19804,104,299'Production of pure methyldichlorophosphane'19784,104,304'Production of methyldichlorophosphane'19784,101,573'Production of methyldichlorophosphane'19784,062,888'Continuous production of 2,5-dioxo-1-oxa-2-phospholanes'19774,045,295'Purification of sulfuric acid containing acetic acid'19774,022,826'Production of beta-halogenoformyl-ethyl phosphinic acid halides'19774,016,048'Distillative purification of 2,5-dioxo-1-oxa-2-phospholanes'19774,012,439'Continuous production of n-butylacrylate free from dibutylether'19774,003,723'Purification of crude hydrogen chloride'19773,985,800'Process for the manufacture of acrylic acid'19763,978,146'Production of 2-chlorobutadiene-1,3'19763,957,899'Production of monovinylacetylene'19763,954,854'Recovery of monomeric acrylic acid from residues originating from processed crude acrylic acid'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1995Patents assigned to HOECHST AG (45)· patent assignee history
1976–1977Based in Erfstadt Lechenich, DT· patent location history
1976Based in Hurth-Knapsack, DE· patent location history
1977–1995Based in Erftstadt, DE· patent location history
1981Based in Erfstadt, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HOECHST AG | 45 | 1976–1995 |
Locations
| Location | Patents | Span |
|---|---|---|
| Erftstadt, DE | 39 | 1977–1995 |
| Erfstadt Lechenich, DT | 3 | 1976–1977 |
| Hurth-Knapsack, DE | 2 | 1976 |
| Erfstadt, DE | 1 | 1981 |