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Inventor

Walter Freyer

Inventor
Stadtbergen, DE

Overview

4→
Patents
1991–2000
Patent span
Chemistry
Primary field (CPC C)

Patents· 4 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C07Cprimary
C07CAcyclic or carbocyclic compounds60%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry20%
C01BNon-metallic elements20%
PatentTitleYear
6,114,591'Process for preparing highly chlorinated paraffins'20005,433,831'Process for the preparation of dichloroacetyl chloride'19955,126,119'Process for producing chlorine-free hydrochloric acid low in AOX'19925,030,753'Process for the preparation of dichloro- or trichloroacetyl chloride'1991

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1991–1995Patents assigned to HOECHST AG (3)· patent assignee history
1991–1992Based in Leitershofen, DE· patent location history
1995–2000Based in Stadtbergen, DE· patent location history
2000Patents assigned to DOVER CHEMICAL CORP (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HOECHST AG31991–1995
DOVER CHEMICAL CORP12000
Locations
LocationPatentsSpan
Stadtbergen, DE21995–2000
Leitershofen, DE21991–1992