Inventor
Herbert Helfert
Inventor
Frankenthal, DE
Overview
Patents· 18 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Dprimary
C07DHeterocyclic compounds17%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests17%
D06PDyeing or printing textiles14%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds10%
C11DDetergent compositions10%
C07CAcyclic or carbocyclic compounds7%
B01DSeparation3%
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds3%
C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients3%
C08LCompositions of macromolecular compounds3%
PatentTitleYear
6,888,006'Method for processing pyrollidone and n-vinyl pyrollidone residues'20056,703,511'Method for obtaining pure n-vinyl pyrrolidone'20045,948,945'Prevention of spontaneous decomposition of gaseous acetylene'19995,723,685'Preparation of monovinyl ethers'19985,710,284'Purification of N-vinylpyrrolidone by crystallization'19985,461,159'Binding chemical impurities contained in crude N-vinylpyrrolid-2-one'19954,614,604'Lubricants for shaping polyvinyl chloride, which contain esterified oligomeric polyhydric alcohols'19864,294,576'Removal of oligomer deposits from textile materials'19814,275,244'Linear polyalkylene ether glycols of high molecular weight'19814,207,199'Solid cold bleach activators for detergents and cleaning agents containing an active oxygen donor'19804,151,127'Process for suppressing the foaming of detergents'19794,113,785'Polyether polyols and method of preparing same'19784,061,684'Highly branched polyether polyols of high molecular weight'19774,052,159'Dyeing process using quaternary ammonium salt as retarder'19774,031,112'Cyclic acetals'19774,006,093'Surfactants containing iodine'19773,963,714'Quaternary ammonium salts'19763,945,794'Production of level dyeings on acrylonitrile polymer fibers with basic dyes'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–2005Patents assigned to BASF AG (15)· patent assignee history
1976–1977Based in Trenton, MI, US· patent location history
1977–1981Patents assigned to BASF WYANDOTTE CORP (3)· patent assignee history
1977–2005Based in Frankenthal, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| BASF AG | 15 | 1976–2005 |
| BASF WYANDOTTE CORP | 3 | 1977–1981 |
Locations
| Location | Patents | Span |
|---|---|---|
| Frankenthal, DE | 14 | 1977–2005 |
| Trenton, MI, US | 4 | 1976–1977 |