Inventor
Bernd Schonfeld
Inventor
Bad Nenndorf, DE
Overview
Patents· 4 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
B24Dprimary
B24DTools for grinding, buffing or sharpening25%
C01BNon-metallic elements13%
C01GCompounds containing metals not covered by subclasses c01d or c01f13%
C01PIndexing scheme relating to structural and physical aspects of solid inorganic compounds13%
C03CChemical composition of glasses, glazes or vitreous enamels13%
C09KMaterials for miscellaneous applications, not provided for elsewhere13%
H01JElectric discharge tubes or discharge lamps13%
PatentTitleYear
4,738,839'Process for the preparation of precipitated silica'19884,370,148'Chlorofluoroferrate(II,III), a process for its manufacture, its use and a grinding wheel containing chlorofluoroferrate(II,III)'19834,297,390'Process for the preparation of a red emitting phosphor coated with red iron oxide and its application'19814,263,016'Non-toxic, active filler for grinding disks, its use and grinding disk containing same'1981Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1981–1983Patents assigned to RIEDEL DE HAEN AG (3)· patent assignee history
1981–1988Based in Bad Nenndorf, DE· patent location history
1988Patents assigned to SCHOENFELD BERND (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| RIEDEL DE HAEN AG | 3 | 1981–1983 |
| SCHOENFELD BERND | 1 | 1988 |
Locations
| Location | Patents | Span |
|---|---|---|
| Bad Nenndorf, DE | 4 | 1981–1988 |