Prayon
13Patents
6Active
13Granted
39Portfolio score
Filing activity: Jan 31, 1974 → Mar 27, 2019 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US3970741A | Method for purifying phosphoric acid | Chemistry; Metallurgy | 8 | Expired |
| US4172791A | Multiple cell filter having a gas discharge | Performing Operations; Transporting | 8 | Expired |
| US4176160A | Process for purifying a zinc sulfate solution | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4330404A | Multiple cell filter with baffles | Performing Operations; Transporting | 5 | Expired |
| US4129454A | Iron oxide based pigment and process for preparing such a pigment | Chemistry; Metallurgy | 4 | Expired |
| US4188366A | Manufacture of phosphoric acid | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4252775A | Process for treatment of residues from ferriferous zinc ores | Emerging Cross-Sectional Technologies | 3 | Expired |
| US8703332B2 | Lithium batteries containing lithium-bearing iron phosphate and carbon | Emerging Cross-Sectional Technologies | 2 | Active |
| US9902658B2 | Iron-based nutritive composition | Performing Operations; Transporting | 1 | Active |
| US10577288B2 | Iron-based nutritive composition | Performing Operations; Transporting | 0 | Active |
| US9287558B2 | Lithium batteries containing lithium-bearing iron phosphate and carbon | Emerging Cross-Sectional Technologies | 0 | Active |
| US11161741B2 | Method for producing polyphosphoric acid and device for such a method | Performing Operations; Transporting | 0 | Active |
| US9505664B2 | Inorganic nutritive iron composition | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.