GRASS VALLEY LIMITED
182Patents
38Active
182Granted
49Portfolio score
Filing activity: Mar 15, 1976 → Oct 26, 2023
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5388197A | Video editing system operator inter-face for visualization and interactive control of video material | Emerging Cross-Sectional Technologies | 354 | Expired |
| US5519828A | Video editing operator interface for aligning timelines | Physics | 228 | Expired |
| US4654696A | Video signal format | Electricity | 91 | Expired |
| US4947440A | Shaping of automatic audio crossfade | Electricity | 89 | Expired |
| US4800432A | Video Difference key generator | Electricity | 87 | Expired |
| US4797836A | Image orientation and animation using quaternions | Physics | 87 | Expired |
| US4988982A | Touch pad machine control | Physics | 87 | Expired |
| US4951036A | Touchpad jogger | Electricity | 75 | Expired |
| US4947097A | Automatic switching of motion control with tactile feedback | Emerging Cross-Sectional Technologies | 66 | Expired |
| US5173948A | Video image mapping system | Electricity | 57 | Expired |
| US5189516A | Video preview system for allowing multiple outputs to be viewed simultaneously on the same monitor | Electricity | 56 | Expired |
| US4698666A | Video key glow and border generator | Electricity | 50 | Expired |
| US5274372A | Sampling rate conversion using polyphase filters with interpolation | Electricity | 43 | Expired |
| US4885582A | """Simple code"" encoder/decoder" | Electricity | 41 | Expired |
| US4853784A | Video switcher with independent processing of selected video signals | Electricity | 41 | Expired |
| US4885792A | Audio mixer architecture using virtual gain control and switching | Electricity | 39 | Expired |
| US5051827A | Television signal encoder/decoder configuration control | Electricity | 37 | Expired |
| US5249039A | Chroma key method and apparatus | Electricity | 37 | Expired |
| US5164966A | NRZ clock and data recovery system employing phase lock loop | Emerging Cross-Sectional Technologies | 37 | Expired |
| US5351092A | Synchronization of digital audio with digital video | Electricity | 35 | Expired |
| US5400081A | Chroma keyer with correction for background defects | Electricity | 35 | Expired |
| US4821269A | Diagnostic system for a digital signal processor | Physics | 34 | Expired |
| US6965723B1 | Non-linear video edit system | Physics | 33 | Expired |
| US4319266A | Chroma keying system | Electricity | 33 | Expired |
| US4965668A | Adaptive rounder for video signals | Physics | 33 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.