Inventor
Ferdinand von Praun
Inventor
Haltern, DE
Overview
Patents· 8 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Cprimary
C07CAcyclic or carbocyclic compounds38%
C01BNon-metallic elements25%
C01DCompounds of alkali metals, i.e. lithium, sodium, potassium, rubidium, caesium, or francium13%
C11DDetergent compositions13%
D06MTreatment, not provided for elsewhere in class d06, of fibres, threads, yarns, fabrics, feathers or fibrous goods made from such materials13%
PatentTitleYear
4,571,426'Process for the production of maleic anhydride'19864,562,264'Process for the recovery of five-membered ring dicarboxylic acid anhydrides'19854,337,234'Method for preparing sodium bicarbonate and hydrogen chloride'19824,272,502'Process for preparing gaseous hydrogen chloride from dilute aqueous hydrochloric acid'19814,259,309'Method for obtaining gaseous hydrogen chloride from dilute aqueous hydrochloric acid'19814,255,356'Purification of tertiary amines using an adsorbent'19814,217,106'Alkaline baths containing alkene sulfonates as wetting agents'19803,993,605'Foam inhibited or attenuated washing, cleaning and rinsing agents for dishes and utensils'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1986Patents assigned to HUELS CHEMISCHE WERKE AG (8)· patent assignee history
1976Based in Lippramsford-Freiheit, DT· patent location history
1980–1986Based in Haltern, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HUELS CHEMISCHE WERKE AG | 8 | 1976–1986 |
Locations
| Location | Patents | Span |
|---|---|---|
| Haltern, DE | 7 | 1980–1986 |
| Lippramsford-Freiheit, DT | 1 | 1976 |