Helmold von Plessen

Person

Kelkheim, DE

People

Patents Grantslast 30 patents

Information Patent Grant
Process for the recovery of valuable materials during the work-up o...
- Patent number 5,464,876
- Issue date Nov 7, 1995
- Hoechst Aktiengesellschaft
- Gunther Lyding
- C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
Information Patent Grant
Process for conditioning waste sulfuric acid
- Patent number 5,308,600
- Issue date May 3, 1994
- Hoechst Aktiengesellschaft
- Helmold von Plessen
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for the preparation of a dioxane adduct of 2-hydroxynaphtha...
- Patent number 5,047,558
- Issue date Sep 10, 1991
- Hoechst Aktiengesellschaft
- Helmold von Plessen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid and proces...
- Patent number 4,925,959
- Issue date May 15, 1990
- Hoechst Aktiengesellschaft
- Helmold von Plessen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the purification of 2-hydroxynaphthalene-6-carboxylic acid
- Patent number 4,916,257
- Issue date Apr 10, 1990
- Hoechst Aktiengesellschaft
- Helmold von Plessen
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the removal of dimethyl ether in methyl chloride
- Patent number 4,794,204
- Issue date Dec 27, 1988
- Hoechst Aktiengesellschaft
- Hendrik W. Post
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for the separation of heavy metal compounds from phosphoric...
- Patent number 4,479,924
- Issue date Oct 30, 1984
- Hoechst Aktiengesellschaft
- Helmold von Plessen
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information Patent Grant
Process for regenerating waste sulfuric acid
- Patent number 4,194,952
- Issue date Mar 25, 1980
- Hoechst Aktiengesellschaft
- Kurt Bodenbenner
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Foam prevention during the regeneration of waste sulfuric acid with...
- Patent number 4,150,103
- Issue date Apr 17, 1979
- Hoechst Aktiengesellschaft
- Kurt Bodenbenner
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Process for the protection against corrosion of cast iron boilers
- Patent number 4,148,858
- Issue date Apr 10, 1979
- Hoechst Aktiengesellschaft
- Helmold von Plessen
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Process for the protection against corrosion of cast iron in boilin...
- Patent number 4,145,393
- Issue date Mar 20, 1979
- Hoechst Aktiengesellschaft
- Helmold von Plessen
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...

Helmold von Plessen

Person

Patents Grantslast 30 patents

Process for the recovery of valuable materials during the work-up o...

Process for conditioning waste sulfuric acid

Process for the preparation of a dioxane adduct of 2-hydroxynaphtha...

Dioxane adduct of 2-hydroxynaphthalene-6-carboxylic acid and proces...

Process for the purification of 2-hydroxynaphthalene-6-carboxylic acid

Process for the removal of dimethyl ether in methyl chloride

Process for the separation of heavy metal compounds from phosphoric...

Process for regenerating waste sulfuric acid

Foam prevention during the regeneration of waste sulfuric acid with...

Process for the protection against corrosion of cast iron boilers

Process for the protection against corrosion of cast iron in boilin...