Patents by Inventor Vittorio Montesi

Vittorio Montesi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4329546
    Abstract: An interface unit inserted between a subscriber line of a telecommunication system and a generator of dial pulses, including a signal converter associated with a pushbutton selector and a memory for the temporary storage of selected digits, comprises a rectifier bridge in series with an impedance network which includes a shunt branch with two complementary transistors interconnected in a positive-feedback circuit and a low-threshold Zener diode in series with one of these transistors across which a reduced supply voltage for the pulse generator remains available when the shunt branch becomes conductive with saturation of the transistors upon a closure of the subscriber's hook switch. An enabling signal for the pulse generator is emitted from the shunt branch upon such conduction. An ancillary transistor, with an input connection across a small series resistor of the network, and a further Zener diode in parallel with the shunt path protect the components thereof against overcurrents and overvoltages.
    Type: Grant
    Filed: May 28, 1980
    Date of Patent: May 11, 1982
    Assignee: Societa Italiana Telecomunicazioni Siemens S.p.A.
    Inventors: Vittorio Montesi, Mario Besi
  • Patent number: 3969592
    Abstract: In order to enable the transmission of digital pulses under the control of a pushbutton-type call-number selector from a dial-equipped subscriber station, the output leads of a keyboard are connected on the one hand to a circulating memory, working into a pulse generator, and on the other hand to a timing network which responds to the depression of any pushbutton on the keyboard with emission of an enabling pulse making the memory receptive to the selected code combination. The timing network includes a delay network which briefly retards the enabling pulse to prevent the storage of spurious signals in response to transient energization of an output lead of the keyboard.
    Type: Grant
    Filed: January 2, 1974
    Date of Patent: July 13, 1976
    Assignee: Societa Italiana Telecomunicazioni Siemens S.p.A.
    Inventors: Roberto Pipitone, Vittorio Montesi