Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 5732133 | System and method for selecting and generating telephone access numbers for limiting access to a telephone service A system and method for selecting and generating telephone access numbers for limiting access to a telephone service. The system includes an auto-dialer having a system clock, a memory device, a processor, and a tone generator. The auto-dialer is used to ... | 03/24/1998 |
| 4161630 | Circuit arrangement for use in telephone systems An automatic telephone exchange including registers for the setting up of calls over outgoing junctions by multi-frequency code--(M.F.C.) signalling, in which the junctors are accessible via M.F. control equipments which are connected to the registers via... | 07/17/1979 |
| 4133980 | Data pulse register/sender for a TDM switching system A dial pulse register/sender for use in a telephone system operating in time frames each consisting of a plurality of time slots. The register/sender is capable of detecting and sending supervisory signals in dial pulse format for each time slot. The regi... | 01/09/1979 |
| 4076965 | Universal receiver/sender A universal receiver/sender is achieved by providing circuitry having parameters setable by binary data words from the data processing unit of a switching facility. A clock signal generator provides output signals corresponding to respective binary instru... | 02/28/1978 |
| 4007337 | Arrangement and method of achieving a dial pulse muting function in a register sender PABX system An arrangement and method for providing a dial pulse muting function to prevent the sender outpulsing from being heard is to disable the sampling of the transmit to the network side of the trunk circuit which is connected through the time switch and to th... | 02/08/1977 |
| 3965305 | Arrangement for increasing the call handling capabilities of a crosspoint tandem system In a communication switching system including a control unit for establishing connections through a switching matrix, the connections being established during a cycle of the control unit and the cycle being divided into a number of sequence states or sub-... | 06/22/1976 |
| 3944751 | Telephone private branch exchange system Telephone automatic switching unit for semi-public use, serving private subscribers and permitting communication by at least a portion of the subscribers via the public communication network by either direct connection of the network, or by means of opera... | 03/16/1976 |
| 3943297 | Electronic private automatic branch exchange An electronic private automatic branch exchange is built around a space divided solid state matrix. One side of the solid matrix provides line appearances which are connected to line circuits, tone receivers, senders and operator loops. The other coordina... | 03/09/1976 |
| 3941938 | Time shared TCMF and MF decoder A TCMF and MF decoder with common decoder section and separate TCMF and MF control sections. The decoder is time shared between two or more registers served on a first-come, first-served basis with priority assigned to one in case of identical seizure tim... | 03/02/1976 |
| 3941949 | Method and apparatus for isolating malfunctions occurring in sender-receiver communication switching system equipment A method and apparatus for isolating malfunctions occurring in a communication switching system having a line switching network for establishing communications selectively between calling and called lines under the control of common equipment including a ... | 03/02/1976 |
