Keith Johnson
12Patents
10h-index
6Co-inventors
65Inventor score
Filing activity: Mar 27, 1981 → Nov 19, 2010
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4339831A | Dynamic annulus heart valve and reconstruction ring | Emerging Cross-Sectional Technologies | 955 | Expired |
| US5449384A | Dynamic annulus heart valve employing preserved porcine valve leaflets | Human Necessities | 366 | Expired |
| US7860574B2 | Implantable medical device with two or more telemetry systems | Human Necessities | 229 | Active |
| US7189258B2 | Heart valve system | Human Necessities | 216 | Expired |
| US5766240A | Rotatable suturing ring for prosthetic heart valve | Emerging Cross-Sectional Technologies | 206 | Expired |
| US7729776B2 | Implantable medical device with two or more telemetry systems | Human Necessities | 144 | Expired |
| US8029564B2 | Prosthetic heart valve system | Human Necessities | 135 | Active |
| US7033390B2 | Prosthetic heart valve system | Human Necessities | 113 | Expired |
| US7503929B2 | Prosthetic heart valve system | Human Necessities | 78 | Active |
| US7468073B2 | Heart valve system | Human Necessities | 53 | Active |
| US8041432B2 | Implantable medical device with two or more telemetry systems | Human Necessities | 9 | Active |
| US4808180A | Prosthetic heart valve | Human Necessities | 9 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.