Inventor
John A. Cengel
Inventor
Wheaton, IL, US
Overview
Patents· 14 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C08Fprimary
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds41%
C07CAcyclic or carbocyclic compounds22%
C10MLubricating compositions19%
C10NIndexing scheme associated with subclass c10m relating to lubricating compositions15%
C07DHeterocyclic compounds4%
PatentTitleYear
4,940,552'Passivation of polyamine dispersants toward fluorohydrocarbon compositions'19904,514,190'Synthetic fuel composition'19854,464,277'Synthetic lubricant composition'19844,455,244'Oxidized mannich condensation product'19844,379,064'Oxidative passivation of polyamine-dispersants'19834,086,251'Process for manufacturing polyalkenyl succinic anhydrides'19784,029,592'Polybutene composition and use thereof'19774,028,264'Polybutene composition containing halo-carbonyl additives and use thereof'19774,008,168'Polybutene composition containing halogen-containing additives and use thereof'19773,985,672'Polybutene composition containing brominated dialkylhydantoin additive and use thereof'19763,960,900'Polybutenylsuccinic anhydride production'19763,954,812'Polybutene composition containing halogen-containing additives and use thereof'19763,953,475'Polybutene composition containing halo-carbonyl additives'19763,935,249'Tar reduction by inorganic halide for reaction of unsaturated anhydride and polybutene'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1985Patents assigned to STANDARD OIL CO INDIANA (9)· patent assignee history
1976Patents assigned to STANDARD OIL CO (4)· patent assignee history
1976–1990Based in Wheaton, IL, US· patent location history
1990Patents assigned to AMOCO CORP (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| STANDARD OIL CO INDIANA | 9 | 1976–1985 |
| STANDARD OIL CO | 4 | 1976 |
| AMOCO CORP | 1 | 1990 |
Locations
| Location | Patents | Span |
|---|---|---|
| Wheaton, Illinois, US | 14 | 1976–1990 |