Ray A. Walker
21Patents
11h-index
20Co-inventors
75Inventor score
Filing activity: Jun 8, 1977 → Dec 13, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5883370A | Automated method for filling drug prescriptions | Physics | 289 | Expired |
| US6312106A | Method and apparatus for transferring information between a replaceable consumable and a printing device | Performing Operations; Transporting | 125 | Expired |
| US6302527A | Method and apparatus for transferring information between a printer portion and a replaceable printing component | Physics | 98 | Expired |
| US6312074A | Method and apparatus for detecting fluid level in a fluid container | Performing Operations; Transporting | 97 | Expired |
| US4129384A | Optical extensometer | Physics | 65 | Expired |
| US6648434B2 | Digitally compensated pressure ink level sense system and method | Performing Operations; Transporting | 53 | Expired |
| US6274880A | Fluid level sensing system and method having controlled surface pairs | Performing Operations; Transporting | 22 | Expired |
| US6345891B1 | Method and apparatus for specifying ink volume in a multichamber ink container | Performing Operations; Transporting | 16 | Expired |
| US6929343B2 | Fluid detection system | Performing Operations; Transporting | 14 | Expired |
| US5327451A | Laser diode assembly for laser scanner system | Electricity | 14 | Expired |
| US6494562B1 | Method and apparatus for identifying a sales channel | Physics | 13 | Expired |
| US6513901B1 | Method and apparatus for determining drop volume from a drop ejection device | Performing Operations; Transporting | 10 | Expired |
| US6863377B2 | Method and apparatus for identifying a sales channel | Physics | 9 | Expired |
| US6431672B1 | Ink container having dual capillary members with differing capillary pressures for precise ink level sensing | Performing Operations; Transporting | 6 | Expired |
| US6676240B2 | Method and apparatus for transferring information between a replaceable consumable and a printing device | Performing Operations; Transporting | 6 | Expired |
| US6247775A | Method and apparatus for detecting ink level | Performing Operations; Transporting | 6 | Expired |
| US4690556A | Capillary bore straightness inspection | Physics | 6 | Expired |
| US6739691B2 | Method and apparatus for preventing theft of replaceable printing components | Physics | 3 | Expired |
| US6685298B2 | Method and apparatus for preventing theft of replaceable printing components | Physics | 2 | Expired |
| US7110127B2 | Method and apparatus for product regionalization | Performing Operations; Transporting | 2 | Expired |
| US10867002B1 | Real estate search interface and method | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.