Robert D. Heyl
9Patents
6h-index
1Co-inventors
49Inventor score
Filing activity: Apr 16, 1976 → Apr 6, 1993
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5494381A | Apparatus and method for pneumatically conveying bulk materials | Performing Operations; Transporting | 46 | Expired |
| US4059205A | Rotary valve | Performing Operations; Transporting | 31 | Expired |
| US5368311A | Shaft seal assembly for a rotary valve | Performing Operations; Transporting | 28 | Expired |
| US4889452A | Vented product pump and air filter arrangement | Performing Operations; Transporting | 17 | Expired |
| US4600032A | Rotary shaft seal assembly | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4770611A | Product pump assembly | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4830043A | Improvement in rotary valves | Emerging Cross-Sectional Technologies | 4 | Expired |
| US5417330A | Apparatus for separating tramp material from a pneumatic conveying systgem | Performing Operations; Transporting | 3 | Expired |
| US5078435A | Self-aligned flanged coupling | Mechanical Engineering; Lighting; Heating | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.