Robert W. Evans
75Patents
21h-index
17Co-inventors
85Inventor score
Filing activity: Sep 20, 1974 → Nov 21, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4587970A | Tachycardia reversion pacer | Human Necessities | 178 | Expired |
| US4985206A | Tissue processing apparatus | Performing Operations; Transporting | 127 | Expired |
| US6507832B1 | Using ink temperature gain to identify causes of web breaks in a printing system | Physics | 88 | Expired |
| US6290004A | Hydraulic jar | Fixed Constructions | 63 | Expired |
| US6481495B1 | Downhole tool with electrical conductor | Fixed Constructions | 49 | Expired |
| US5086853A | Large bore hydraulic drilling jar | Fixed Constructions | 46 | Expired |
| US4361195A | Double acting hydraulic mechanism | Fixed Constructions | 37 | Expired |
| US5624001A | Mechanical-hydraulic double-acting drilling jar | Fixed Constructions | 36 | Expired |
| US6988551B2 | Jar with adjustable trigger load | Fixed Constructions | 33 | Expired |
| US4293038A | Ball valve assembly | Emerging Cross-Sectional Technologies | 32 | Expired |
| US5511718A | Process for making monolayer superabrasive tools | Performing Operations; Transporting | 32 | Expired |
| US5232060A | Double-acting accelerator for use with hydraulic drilling jars | Fixed Constructions | 31 | Expired |
| US4604964A | Tissue processing apparatus | Physics | 30 | Expired |
| US4000074A | Centrifuge having an inner, invertible, funnel-like container | Performing Operations; Transporting | 30 | Expired |
| US9095368B2 | Follicular unit extraction device | Human Necessities | 29 | Active |
| US5318139A | Reduced waiting time hydraulic drilling jar | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| US7510008B2 | Method and apparatus for decreasing drag force of trigger mechanism | Fixed Constructions | 26 | Active |
| US4566546A | Single acting hydraulic fishing jar | Fixed Constructions | 25 | Expired |
| US4705630A | Centrifugation | Physics | 22 | Expired |
| US7290604B2 | Downhole tool with pressure balancing | Fixed Constructions | 22 | Expired |
| US4657084A | Twin seal well packer | Fixed Constructions | 21 | Expired |
| US4441559A | Retrievable well packer | Fixed Constructions | 19 | Expired |
| US7311149B2 | Jar with adjustable preload | Fixed Constructions | 18 | Expired |
| US7854425B2 | Belleville spring guide system | Mechanical Engineering; Lighting; Heating | 18 | Active |
| US4332267A | Ball valve assembly | Emerging Cross-Sectional Technologies | 18 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.