| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 6 | |
| #2 | Sweden | 3 | |
| #3 | Finland | 2 | |
| #4 | Austria | 1 | |
| #5 | Denmark | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Electrically-conductive connections | |
| #2 | Dynamo-electric machines | |
| #3 | Unspecified technologies | |
| #4 | Cables and insulators |
| # | Name | Total Patents |
|---|---|---|
| #1 | Foerste W | 6 |
| #2 | Ostermay Gottfried | 6 |
| #3 | Ostermay G | 5 |
| #4 | Forste Walter | 5 |
| #5 | Schreiber J | 3 |
| #6 | Schreiber Joachim | 2 |
| #7 | Schiewart K | 1 |
| #8 | Noack Werner | 1 |
| #9 | Foerste Walter | 1 |
| #10 | Ostermay F | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3548232A | Collector ring units for electric motors | |
| US3525148A | Method of making carbon commutator | |
| US3525149A | Method of making carbon commutators | |
| US3473062A | Carbon commutator | |
| US3473063A | Carbon commutators | |
| US3532913A | Contacts between commutator lamellae and armature winding ends of electric motors |