Inventor
Karlfried Keller
Inventor
Bergen-Enkheim, DT
Overview
Patents· 7 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Dprimary
C07DHeterocyclic compounds13%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds13%
C14CChemical treatment of hides, skins or leather, e.g. tanning, impregnating, finishing13%
B32BLayered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form6%
B44CProducing decorative effects6%
C04BLime, magnesia6%
C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients6%
C08LCompositions of macromolecular compounds6%
C09DCoating compositions, e.g. paints, varnishes or lacquers6%
D21HPulp compositions6%
PatentTitleYear
4,822,372'Processing for tanning leather'19894,810,252'Process for tanning leather'19894,223,141'Preparation of methoxy-methyl melamines'19804,143,016'Preparation of melamine derivatives'19794,079,040'Sulfo-containing phenol-formaldehyde condensates'19784,043,984'Aminoplasts elasticized with benzoic acid esters'19774,039,493'Melamine-formaldehyde condensates and mixtures thereof'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–1989Patents assigned to CASSELLA FARBWERKE MAINKUR AG (6)· patent assignee history
1977–1979Based in Bergen-Enkheim, DT· patent location history
1980–1989Based in Frankfurt am Main, DE· patent location history
1989Patents assigned to HOECHST AG (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| CASSELLA FARBWERKE MAINKUR AG | 6 | 1977–1989 |
| HOECHST AG | 1 | 1989 |
Locations
| Location | Patents | Span |
|---|---|---|
| Bergen-Enkheim, DT | 4 | 1977–1979 |
| Frankfurt am Main, DE | 3 | 1980–1989 |