Inventor
Frederick H. Howell
Inventor
Atherton, GB
Overview
Patents· 14 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Cprimary
C07CAcyclic or carbocyclic compounds29%
C07FAcyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium21%
C07DHeterocyclic compounds18%
G03CPhotosensitive materials for photographic purposes18%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds8%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments3%
H05KPrinted circuits3%
PatentTitleYear
4,924,015'Substituted anthraquinones and use thereof in epoxy resins'19904,904,815'Phenols and their production'19904,835,323'Hydroquinones'19894,716,248'Aminocyclohexyl-substituted, branch alkylamines'19874,700,003'Ortho nitroanilines and a process for their production'19874,661,601'Resorcinol compounds'19874,647,699'New diamines and a process for their production'19874,631,252'Hydroquinone ether compounds'19864,616,082'Hydroquinone ether compounds'19864,608,435'Benzo-1,4-quinones'19864,554,379'Aminoalkyl aromatic compounds and their production'19854,549,015'Hydroquinone ether compounds'19854,484,000'Hydroquinones'19844,436,936'Alkylation and aralkylation of aromatic amines'1984Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1984–1990Patents assigned to CIBA GEIGY AG (8)· patent assignee history
1984–1990Patents assigned to CIBA GEIGY CORP (6)· patent assignee history
1984–1990Based in Atherton, GB· patent location history
1987Based in Lancashire, GB· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| CIBA GEIGY AG | 8 | 1984–1990 |
| CIBA GEIGY CORP | 6 | 1984–1990 |
Locations
| Location | Patents | Span |
|---|---|---|
| Atherton, GB | 13 | 1984–1990 |
| Lancashire, GB | 1 | 1987 |