Inventor
Johann-Wilhelm Frey
Inventor
Stade, DE
Overview
Patents· 7 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C07Cprimary
C07CAcyclic or carbocyclic compounds55%
B01JChemical or physical processes, e.g. catalysis or colloid chemistry18%
C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds9%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds9%
Y02PClimate change mitigation technologies in the production or processing of goods9%
PatentTitleYear
8,937,145'Epoxy resin compositions'20157,989,514'Strong-acid cation exchange resins'20117,586,012'Process for recovering an adduct of a bis(4-hydroxyaryl)alkane and a phenolic compound'20097,067,704'Process for purifying bisphenol-a'20066,740,684'Process for producing a strong-acid cation exchange resin'20045,723,688'Process for preparing an adduct of a bisphenol with phenolic compound'19985,288,926'Process for preparing a bisphenol'1994Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1994–1998Patents assigned to DOW CHEMICAL CO (2)· patent assignee history
1994–2015Based in Stade, DE· patent location history
2004–2009Patents assigned to DOW GLOBAL TECHNOLOGIES INC (3)· patent assignee history
2011–2015Patents assigned to DOW GLOBAL TECHNOLOGIES LLC (2)· patent assignee history
2015Patents assigned to FREY JOHANN-WILHELM (1)· patent assignee history
2015Patents assigned to HEFNER JR ROBERT E (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| DOW GLOBAL TECHNOLOGIES INC | 3 | 2004–2009 |
| DOW CHEMICAL CO | 2 | 1994–1998 |
| DOW GLOBAL TECHNOLOGIES LLC | 2 | 2011–2015 |
| FREY JOHANN-WILHELMself | 1 | 2015 |
| HEFNER JR ROBERT E | 1 | 2015 |
Locations
| Location | Patents | Span |
|---|---|---|
| Stade, DE | 7 | 1994–2015 |