Etak, Inc.
22Patents
0Active
22Granted
39Portfolio score
Filing activity: Jun 7, 1984 → Sep 29, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4914605A | Apparatus and method for displaying a map | Physics | 286 | Expired |
| US5311195A | Combined relative and absolute positioning method and apparatus | Physics | 261 | Expired |
| US5948043A | Navigation system using GPS data | Physics | 218 | Expired |
| US4796191A | Vehicle navigational system and method | Physics | 203 | Expired |
| US4734863A | Apparatus for generating a heading signal for a land vehicle | Physics | 142 | Expired |
| US6021406A | Method for storing map data in a database using space filling curves and a method of searching the database to find objects in a given area and to find objects nearest to a location | Emerging Cross-Sectional Technologies | 119 | Expired |
| US6038509A | System for recalculating a path | Physics | 111 | Expired |
| US5893081A | Using multiple levels of costs for a pathfinding computation | Physics | 105 | Expired |
| US6016485A | System for pathfinding | Physics | 99 | Expired |
| US6161092A | Presenting information using prestored speech | Physics | 99 | Expired |
| US5546107A | Automatic chain-based conflation of digital maps | Physics | 96 | Expired |
| US5729458A | Cost zones | Physics | 95 | Expired |
| US5978730A | Caching for pathfinding computation | Physics | 92 | Expired |
| US4788645A | Method and apparatus for measuring relative heading changes in a vehicular onboard navigation system | Physics | 62 | Expired |
| US5694534A | Apparatus storing a presentation of topological structures and methods of building and searching the representation | Physics | 62 | Expired |
| US5916299A | Method for determining exits and entrances for a region in a network | Electricity | 58 | Expired |
| US4811491A | Two-axis differential capacitance inclinometer | Physics | 41 | Expired |
| US4613913A | Data encoding and decoding scheme | Physics | 39 | Expired |
| US6026384A | Cost zones | Physics | 38 | Expired |
| US4646015A | Flux gate sensor with improved sense winding gating | Physics | 29 | Expired |
| US4811613A | Two-axis angular rate gyroscope | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4686642A | Method and apparatus for generating a stroke on a display | Physics | 19 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.