Apparatus for selectively transmitting television images from a plurality of cameras to a monitor
Patent 4091422 Issued on May 23, 1978. Estimated Expiration Date: 
May 23, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 23, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3258531 3437753 InventorApplicationNo. 749392 filed on 12/08/1976US Classes:348/211.11, Plural cameras being controlled348/211.2, Wireless348/262With plural image scanning devicesExaminersPrimary: Richardson, Robert L.Attorney, Agent or FirmInternational ClassesH04N 005/22H04N 007/00 AbstractA system for selectively transmitting television images includes a plurality of television cameras for generating image signals. The cameras may be placed at different respective locations, and at least a single television monitor-receiver is provided for selectively receiving and monitoring one of the image signals. The monitor-receiver includes a circuit for generating common line and field synchronizing signals for the cameras, and an activation-signal generating circuit for supplying activation signals for the cameras, respectively. The activation and synchronizing signals are transmitted to the cameras, respectively, by cable or radio-frequency. | |
