Gebr. Pfeiffer AG
6Patents
2Active
6Granted
30Portfolio score
Filing activity: Nov 28, 1975 → Sep 20, 2010 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4071441A | Bypass separator | Performing Operations; Transporting | 6 | Expired |
| US4491280A | Roller mill construction | Performing Operations; Transporting | 5 | Expired |
| US7926754B2 | Safety systems for roller mills | Performing Operations; Transporting | 5 | Active |
| US4456267A | Seal arrangement for pull rods in rolling mills | Performing Operations; Transporting | 2 | Expired |
| US8172168B2 | Roller grinding mill | Performing Operations; Transporting | 2 | Active |
| US4465240A | Bowl mill pulverizer | Performing Operations; Transporting | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.