David Eugene Robertson
19Patents
10h-index
15Co-inventors
69Inventor score
Filing activity: Jul 19, 1983 → Jul 8, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4625914A | Rotary drive sprinkler | Performing Operations; Transporting | 86 | Expired |
| US5351843A | Folding display frame for forming column-like structures | Mechanical Engineering; Lighting; Heating | 62 | Expired |
| US6997393B1 | Pop-up irrigation sprinklers | Performing Operations; Transporting | 51 | Expired |
| US4787558A | Rotary drive sprinkler | Performing Operations; Transporting | 39 | Expired |
| US6234411A | Combined nozzle set and lift tool for a pop-up sprinkler | Emerging Cross-Sectional Technologies | 38 | Expired |
| US9174227B2 | Irrigation sprinkler nozzle | Performing Operations; Transporting | 21 | Active |
| US8783582B2 | Adjustable arc irrigation sprinkler nozzle configured for positive indexing | Performing Operations; Transporting | 20 | Active |
| USD415415S | Combined sprinkler nozzle carrier and display unit | General | 16 | Expired |
| USD299748S | Electronic acupuncture unit | General | 14 | Expired |
| US10322423B2 | Rotary nozzle | Performing Operations; Transporting | 13 | Active |
| USD486884S1 | Irrigation sprinkler nozzle carrier tree | General | 8 | Expired |
| US4781328A | Rotating stream nozzle | Emerging Cross-Sectional Technologies | 8 | Expired |
| USD282768S | Sprinkler drive arm | General | 4 | Expired |
| US11406999B2 | Irrigation nozzle with one or more grit vents | Performing Operations; Transporting | 2 | Active |
| US11660621B2 | Reduced precipitation rate nozzle | Performing Operations; Transporting | 2 | Active |
| US11247219B2 | Reduced precipitation rate nozzle | Performing Operations; Transporting | 1 | Active |
| US11000866B2 | Rotary nozzles and deflectors | Performing Operations; Transporting | 0 | Active |
| US12053791B2 | Irrigation nozzle with one or more grit vents | Performing Operations; Transporting | 0 | Active |
| US11154881B2 | Rotary nozzle | Performing Operations; Transporting | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.