Inventor
Sigberg Pfohl
Inventor
Speyer, DE
Overview
Patents· 11 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
D21Hprimary
D21HPulp compositions41%
C07DHeterocyclic compounds18%
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds18%
C07CAcyclic or carbocyclic compounds6%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments6%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests6%
Y10TTechnical subjects covered by former us classification6%
PatentTitleYear
5,131,981'Coloring paper'19924,978,427'Water-soluble copolymers containing vinylamine units as wet strength and dry strength agent for paper'19904,880,497'Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper'19894,818,341'Production of paper and paperboard of high dry strength'19894,804,387'Liquid black dye mixture'19894,784,724'Making paper which has a high dry strength'19884,774,285'Preparation of water-soluble copolymers containing vinylamine units, and their use as wet strength agents and dry strength agents for paper'19884,294,873'Manufacture of paper having a high dry strength and a low wet strength'19814,191,692'Manufacture of tocopherol'19804,081,477'Pinane derivatives'19783,996,246'Resolution of racemic pantolactone'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1992Patents assigned to BASF AG (11)· patent assignee history
1976–1992Based in Speyer, DE· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| BASF AG | 11 | 1976–1992 |
Locations
| Location | Patents | Span |
|---|---|---|
| Speyer, DE | 11 | 1976–1992 |