US3736377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple channel video switching system
Assignee: Individual
•
Filing: 1971-05-10
•
Granted: 1973-05-29
•
Expires: 1991-05-10
Abstract
Abstract composite display system for a plurality of television cameras in which one camera develops synchronizing signals and video waveform switching signals for the other cameras using delays from one-shot multivibrator circuits. The video switching is performed by a circuit having dual gate insulated insulated effect transistors with one gate of each being fed by a switching waveform signal and the other gate by the video signal from the corresponding camera.
Inventors
- 👤 R Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:26
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/2624
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A composite television display system comprising: a. a first television camera having an output of synchronizing signals and a video signal output; b. a second television camera having a video signal output; c. means for generating synchronizing signals corresponding to the composite display portion of the second television camera and fed to the second television camera, the synchronizing signal generating means being fed by the synchronizing output of the first television camera; d. means for generating a plurality of video switching waveforms corresponding to the composite display, the switching waveform generating means being fed by the synchronizing output of the first television camera; and e. a video switching circuit fed by the video signals of the first and second television and the switching waveforms.
Claim 2
Dependent Claim
124 words
A composite television display system comprising: a. a first television camera having an output of synchronizing signals and a video signal output; b. a second television camera having a video signal output; c. means for generating synchronizing signals corresponding to the composite display portion of the second television camera and fed to the second television camera, the synchronizing signal generating means being fed by the synchronizing output of the first television camera; d. means for generating a plurality of video switching waveforms corresponding to the composite display, the switching waveform generating means being fed by the synchronizing output of the first television camera; and e. a video switching circuit fed by the video signals of the first and second television and the switching waveforms.
Claim 3
Dependent Claim
27 words
A composite television display system according to claim 1 where the means for generating synchronizing signals and the means for generating switching waveforms are one-shot multivibrator circuits.
Claim 4
Dependent Claim
47 words
A composite television display system according to claim 2 wherein the video switching circuit includes a plurality of dual gate field effect transistors with one gate of each transistor being fed by the waveform generator means and the other gate being fed by a corresponding video signal.
References Cited (Backward Citations)
US2172936A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |