Heinz Dreyer
22Patents
11h-index
16Co-inventors
72Inventor score
Filing activity: Apr 14, 1975 → Aug 22, 1995
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4726304A | Seed drill | Emerging Cross-Sectional Technologies | 77 | Expired |
| US4208974A | Seed drill having parallel guide means for the movable shank | Emerging Cross-Sectional Technologies | 73 | Expired |
| US4580507A | Drill for applying seed and fertilizer | Emerging Cross-Sectional Technologies | 58 | Expired |
| US4275670A | Seed drill mounting arrangement | Emerging Cross-Sectional Technologies | 43 | Expired |
| US4407207A | Drill having disk furrow openers | Human Necessities | 34 | Expired |
| US4422392A | Seed drill with disk-type furrow openers | Emerging Cross-Sectional Technologies | 30 | Expired |
| US4916103A | Preparation of a catalytically active composition for the gas phase oxidation of propylene to acrolein and acrylic acid | Performing Operations; Transporting | 24 | Expired |
| US4366760A | Seed drill | Human Necessities | 17 | Expired |
| US4694759A | Seed drill | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4020991A | Machine for the pneumatic spreading of granular material | Human Necessities | 15 | Expired |
| US4142685A | Machine for the pneumatic spreading of granular material | Human Necessities | 12 | Expired |
| US4786402A | Preparation of medicinal white oils and medicinal paraffins | Chemistry; Metallurgy | 11 | Expired |
| US4351481A | Centrifugal spreader, especially for granulated fertilizers | Human Necessities | 9 | Expired |
| US4263858A | Seed and fertilizer drill drive | Human Necessities | 9 | Expired |
| US4480948A | Machine for applying pellets and powder | Human Necessities | 6 | Expired |
| US5736076A | Graphite moldings | Performing Operations; Transporting | 6 | Expired |
| US4175705A | Machine for the spreading of material in granular and powder form | Human Necessities | 4 | Expired |
| US4202474A | Machine for spreading fertilizer and seed | Emerging Cross-Sectional Technologies | 4 | Expired |
| US4058180A | Attaching device for mounting of a broadcast fertilizer spreader on a tractor | Human Necessities | 4 | Expired |
| US4234129A | Mounting device for agricultural spreading machines | Human Necessities | 3 | Expired |
| US4037545A | Machine for distributing material | Human Necessities | 2 | Expired |
| US4580508A | Seed drill | Human Necessities | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.