Inventor
Hans Frischkorn
Inventor
Hofheim, DE
Overview
Patents· 8 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Dprimary
C07DHeterocyclic compounds33%
D06LDry-cleaning, washing or bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods33%
C07CAcyclic or carbocyclic compounds17%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments8%
C09KMaterials for miscellaneous applications, not provided for elsewhere8%
PatentTitleYear
4,791,205'Bisbenzoxazolylnaphthalenes containing sulfonate or sulfonamide groups, a process for their preparation and their use'19884,447,350'Mixtures of optical brighteners and their use'19844,416,795'Mixtures of optical brighteners'19834,376,214'Process for the preparation of naphthalene-1,4-dicarboxylic acid'19834,375,556'Process for the preparation of naphthalene-1,4-dicarboxylic acid'19834,271,036'Colorless formulations of optical brighteners from the series of bis-triazinylamino-stilbene-disulfonic acid compounds'19814,110,246'Mixture of benzoxazole derivatives'19783,996,213'1,2,4-Triazolyl-(1) derivatives, a process for their preparation and their use as optical brighteners'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1988Patents assigned to HOECHST AG (8)· patent assignee history
1976–1988Based in Hofheim, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HOECHST AG | 8 | 1976–1988 |
Locations
| Location | Patents | Span |
|---|---|---|
| Hofheim, DE | 8 | 1976–1988 |