Extel Corporation
18Patents
0Active
18Granted
32Portfolio score
Filing activity: Jul 5, 1974 → Feb 29, 1988
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4839802A | Adaptation of computer to communication operation | Physics | 50 | Expired |
| US4850008A | Method and apparatus for discrimination between different kinds of data transmission | Emerging Cross-Sectional Technologies | 35 | Expired |
| US4298786A | Thin film thermal print head | Emerging Cross-Sectional Technologies | 25 | Expired |
| US3990559A | Method and apparatus for multiple speed print rate control for dot matrix printer | Performing Operations; Transporting | 21 | Expired |
| US4037705A | Descender printing system for dot matrix printer | Emerging Cross-Sectional Technologies | 21 | Expired |
| US3973662A | Acceleration control system for high speed printer | Performing Operations; Transporting | 18 | Expired |
| US3938641A | Control system for high speed printer | Physics | 13 | Expired |
| US4206541A | Method of manufacturing thin film thermal print heads | Emerging Cross-Sectional Technologies | 11 | Expired |
| US4044946A | Tape punch machine | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4063045A | Telecommunication line switching circuit | Electricity | 8 | Expired |
| US3954167A | High speed printer | Performing Operations; Transporting | 8 | Expired |
| US4242004A | Dot matrix printhead driver | Performing Operations; Transporting | 6 | Expired |
| US4363461A | Tape reader motor mount | Physics | 5 | Expired |
| US4346854A | Printer paper take-up and storage device | Performing Operations; Transporting | 4 | Expired |
| US4392755A | Magnetic dot matrix printing | Performing Operations; Transporting | 2 | Expired |
| US4392754A | Magnetic dot matrix printing method and apparatus | Performing Operations; Transporting | 1 | Expired |
| US3964673A | Tape punch machine | Physics | 1 | Expired |
| US4019676A | Tape punch machine | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.