NATIONAL RESEARCH DEVELOPMENT CORPORATION
1,209Patents
3Active
1,209Granted
48Portfolio score
Filing activity: Mar 19, 1969 → Aug 18, 2010 · 3 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4085466A | Prosthetic joint device | Human Necessities | 734 | Expired |
| US4655885A | Surface-modified electrode and its use in a bioelectrochemical process | Chemistry; Metallurgy | 385 | Expired |
| US4955379A | Motion artefact rejection system for pulse oximeters | Human Necessities | 346 | Expired |
| US4562157A | Diagnostic device incorporating a biochemical ligand | Emerging Cross-Sectional Technologies | 310 | Expired |
| US4634807A | Software protection device | Physics | 288 | Expired |
| US4318784A | Enzymatic processes | Chemistry; Metallurgy | 259 | Expired |
| US4441489A | Orthopaedic splints | Human Necessities | 241 | Expired |
| US4204283A | Prosthetic valve | Emerging Cross-Sectional Technologies | 223 | Expired |
| US4564007A | Orthopaedic external fixation devices | Human Necessities | 214 | Expired |
| US4857041A | Urinary incontinence prostheses | Emerging Cross-Sectional Technologies | 207 | Expired |
| US4592369A | Method and apparatus for use in temporal analysis of waveforms | Human Necessities | 193 | Expired |
| US4799258A | Apparatus and methods for granting access to computers | Physics | 192 | Expired |
| US4826490A | Safety device for hypodermic needle or the like | Human Necessities | 190 | Expired |
| US5069160A | Automatic milking of animals | Human Necessities | 180 | Expired |
| USRE34036E | Data transmission using a transparent tone-in band system | General | 176 | Expired |
| US3946446A | Prosthetic bone joint | Human Necessities | 173 | Expired |
| US4476590A | Antimicrobial surgical implants | Emerging Cross-Sectional Technologies | 159 | Expired |
| US4024163A | Insecticides | Chemistry; Metallurgy | 157 | Expired |
| US4459854A | Ultrasonic transducer coupling member | Physics | 150 | Expired |
| US4532660A | Endoprosthetic bone joint devices | Human Necessities | 142 | Expired |
| US4114121A | Apparatus and methods for launching and screening electromagnetic waves in the dipole mode | Electricity | 135 | Expired |
| US4570625A | Apparatus for external fixation of bone fractures | Human Necessities | 123 | Expired |
| US4042980A | Endoprosthetic shoulder joint device | Human Necessities | 121 | Expired |
| US5143660A | Method of casting a contact lens | Emerging Cross-Sectional Technologies | 119 | Expired |
| US4615705A | Antimicrobial surgical implants | Emerging Cross-Sectional Technologies | 116 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.