WO1991004551A1 - Commande de sonnette programmable - Google Patents

Commande de sonnette programmable Download PDF

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Publication number
WO1991004551A1
WO1991004551A1 PCT/US1989/004111 US8904111W WO9104551A1 WO 1991004551 A1 WO1991004551 A1 WO 1991004551A1 US 8904111 W US8904111 W US 8904111W WO 9104551 A1 WO9104551 A1 WO 9104551A1
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WO
WIPO (PCT)
Prior art keywords
doorbell
switch
time
signals
day
Prior art date
Application number
PCT/US1989/004111
Other languages
English (en)
Inventor
Todd B. Housley
Original Assignee
Housley Todd B
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Housley Todd B filed Critical Housley Todd B
Publication of WO1991004551A1 publication Critical patent/WO1991004551A1/fr

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

Definitions

  • This invention relates to controllers and more particularly to a doorbell controller.
  • a doorbell switch, annunciator, and chime device included a case having a lower window for displaying a name card, an upper window for displaying messages, and a doorbell pushbutton switch located between them.
  • a dial was provided around the pushbutton switch; the dial was manually set to identify the expected return time of an absent occupant. Lamps were positioned behind the upper slot of illuminating a photographic film positioned in the upper slot. The photographic film contained the messages the occupant desired to display.
  • the lower slot was designed to receive a name card for display.
  • a two-way switch was connected between the pushbutton switch, lights, and chime.
  • the switch could be thrown to a first position to connect the lights to a source of power to illuminate the message and to break the doorbell circuit and to a second position to turn off the lights and connect the doorbell.
  • the device includes a read only memory (ROM) for storing a repertoire of musical tunes, one of which is displayed when a doorbell pushbutton switch is pressed.
  • the tune to be played is selected by a keyboard connected to a microprocessor.
  • the microprocessor reads from memory each digitally-encoded musical note for a note strike and decay circuit. This circuit converts the digital note to analog signals for energizing a loudspeaker.
  • a clock generates the time for the microprocessor to automatically ring the chimes to indicate the hour of the day.
  • doorbell devices of interest includes a door signal regulator circuit which rings the bell at a constant rate regardless of whether the pushbutton is depressed only momentarily or for a long period of time (United States Patent No. 2,909,771 issued Oct. 20, 1959).
  • Another doorbell with hour-of-return indicator includes a doorbell enabling switch and two dials (hours and minutes) concentrically mounted about the pushbutton switch for setting and lighting the time of return in a window when the doorbell is cut off and enabling the doorbell when non-lettered spaces of the dials are positioned in the window.
  • Still another door signal device includes a key-controlled lock switch to provide a visual indication when the occupant is absent and has locked his door.
  • the doorbell is cut off when the door is locked (United States Patent No. 2,039,975 issued May 5, 1936) .
  • the programmable doorbell control device of the present invention is a low-power device connectable to existing household wiring.
  • the device has automatic and manual modes of operation.
  • the automatic mode provides a means of disabling and re-enabling the doorbell by programming the device to perform these functions at a specified time.
  • the device When disabled, the device will display a selected one of a plurality of messages and sound an audible tone when the button is pressed, in order to direct the visitor's attention to the displayed message.
  • the manual mode is selected to override the automatic operation mode.
  • the device continuously displays the name of the party occupying the home.
  • a visitor pushing a button hears a tone directing his attention to the display for receiving a message.
  • a repertoire of messages is provided including a PLEASE KNOCK message to localize the sound when an occupant such as, for example, a baby is sleeping and not -to be disturbed. Or, if the occupant is a daytime sleeper, a DAYTIME SLEEPER message, or, if the occupant does not want to be disturbed, a DO NOT DISTURB message can be displayed.
  • a second embodiment in which a recording and playback device is used to first record a message spoken by the user in his native language and, subsequently, to playback the recorded message when the doorbell button is pushed.
  • the recording and reproducing capability can be used either with or without the internal timer.
  • Still another object of the invention is to provide a doorbell control system which automatically disables and enables the doorbell at preselected times.
  • a further object of the invention is to provide a doorbell in which an audible message can be recorded by the user and reproduced when the doorbell is operated.
  • Still a further object of the invention is to provide a doorbell in which audible messages can be recorded and played back using low cost circuitry.
  • the invention provides a programmable doorbell device for either automatically or manually controlling the operation of a doorbell depending upon the positioning of a mode selection switch.
  • a controller interfaces with the operator, keeps the time of day, controls the enabling and disabling of the doorbell, controls a tone generator, and controls a display.
  • the occupant enters his name, selects a message for display, sets the clock to the time of day, and sets the times for enabling and disabling the doorbell.
  • the tone generator When the doorbell pushbutton switch is pressed, the tone generator generates a tone for directing a visitor's attention to the display and the display displays an informational message selected from a repertoire thereof. The name of the house occupant is continuously displayed.
  • the controller In the manual mode, the controller is bypassed and control of the doorbell is returned directly to the doorbell's pushbutton switch.
  • an audible announcement is recorded using digital technology.
  • the occupant records a message by speaking into a microphone.
  • the analog signals generated by the microphone are encoded into digital signals by means of a speech-encoding integrated circuit.
  • the resulting digital signals are stored in an integrated circuit memory. Later, when the doorbell is pushed, the stored digital signals are retrieved from the memory and provided to an integrated circuit speech synthesizer which generates audio analog signals.
  • the audio signals are amplified and used to dfive a speaker which generates the audible message.
  • Fig. 1 is an isometric view of the programmable doorbell device
  • Fig. 2 is a block schematic diagram of the programmable doorbell device circuit
  • Fig. 3 is a block schematic diagram of the controller for the programmable doorbell device.
  • Fig. 4 is a flowchart for setting the operational parameters of the programmable doorbell device.
  • Fig. 5 is a circuit diagram of another embodiment which records and generates an audible announcement.
  • Fig. 6 is a block schematic diagram of the speech recording and playback circuitry.
  • the programmable doorbell device 10 (Fig. 1) includes a housing 12 having a front panel 14.
  • the front panel includes a pushbutton switch 16 and a display such as, for example, a liquid crystal display 18.
  • the housing 12 also has a bottom 20 having mounted therein control switches including a switch 22 for selecting either the automatic or manual operation mode, a mode pushbutton switch 24 and a change pushbutton switch 26.
  • the mode and change pushbutton switches 24 and 26 are for setting and changing the operational parameters of the programmable doorbell device 10.
  • the housing 12 houses the circuitry including the electronic circuitry for the programmable doorbell device 10.
  • the electronic circuitry 28 for the solid state programmable doorbell device 10 includes a power source 30 connected by leads 32 and 33 for supplying power to a controller 34, liquid crystal display (LCD) 18 and tone generator 36.
  • the power source is separate from the house power supply. It comprises a small, inexpensive watch battery; thus, existing electric doorbell switches are replaced without requiring the expertise and expense of an electrician nor any change in the house wiring.
  • the control switches including the mode switch 24, change switch 26 and manual switch 22, are typical state-of-the-art switches connected to the controller for purposes hereinafter described. The switches provide a short pulse to a detection circuit. Debouncing circuitry is in the controller to minimize the external component count and to simplify the manufacturing process.
  • the controller 34 is connected by bus 42 to the LCD display which includes the display drivers.
  • the LCD display bus 42 includes an 8-bit data bus, a 4-bit address (character select) bus, a strobe signal line to synchronize communication between the display and the display control circuit and a blink line which, when active high, causes the character being sent to be blinked on the display.
  • the display 18 is a three-segment LCD display of typical LCD display construction.
  • the display includes a twelve- character display segment for the occupant's name and two seven-character display segments for the information message to be displayed,
  • the controller 34 is also connected by leads 44 and 46, respectively, to the tone generator 36 and doorbell control circuit 48 for control purposes.
  • the tone generator is a typical tone generator including an oscillator and transducer. When the tone strobe output of the controller becomes active, the oscillator will engage and provide a short tone burst to the transducer for generating an audible frequency suitable for signalling purposes.
  • the doorbell control circuit includes an electronic switch, such as, for example, a TRIAC having its gate connected to a bell enable control output of the controller.
  • the TRIAC controls the application of household power to a suitable electric doorbell 50 connected in series therewith.
  • a suitable electric doorbell 50 connected in series therewith.
  • the controller 34 includes a clock 52 connected to a memory 54 and a bell enable control circuit 56.
  • the memory 54 is connected to a display control 58 and to the bell enable control circuit 56.
  • the bell enable control circuit 56 is connected to the manual on/off switch 22 and to the bell control circuit 48.
  • the display control 58 is connected to the mode switch 24 and change switch 26 and outputs control signals to the LCD display and tone strobe signals to the tone generator.
  • the function of the clock 52 is to fetch the present time of day from memory, wait one minute and write the new time back to the time of day register in memory 54.
  • the clock includes an oscillator and a counter not shown, once the correct count is observed at the counter output, a minute has expired causing the memory to be updated with the new time.
  • the memory 54 stores all of the programmed information.
  • the only parameter which will be altered once the device is programmed is the time of day which changes by the minute.
  • the display control 58 supplies the custom LCD with the data to be displayed in the twelve character name display.
  • the display 18 (Fig. 2) is used while programming in order to prompt the operator for the required parameters and it also displays the house occupant's name during normal operation. Thus, the data displayed in this segment of the display is changed depending upon the operation mode.
  • the display control 58 (Fig. 3) provides the LCD with a stream of 12 one-byte ASCII coded characters, a 4-bit decoding nibble, a strobe pulse and a blink character signal.
  • the display control circuit also provides the display with a 2-bit disable message select signal.
  • the display control 58 interfaces with the operator through the mode and change switches 24 and 26 (Fig. 2).
  • the display control circuit (Fig. 3) detects the pressing of the mode switch and increments the parameter in memory pointed to by an address counter to the next value each time the change switch is pressed. This circuit enters the normal operation mode when the last parameter is entered and the mode switch is pressed. In the normal operation mode, the name and message to be displayed are sent to the display 18.
  • the doorbell enable control circuit 56 fetches the bell disable time and the time of day from memory, compares them and determines if the doorbell should be disabled. Once disable, the circuit fetches the enable time and the time of day and compares those to determine if the doorbell should again be enabled. Thus, the circuit will provide the doorbell control 48 (Fig. 2) an active high signal at the doorbell enable output when the doorbell is enabled and an inactive low signal when the doorbell is disabled. The circuit also monitors the manual on/off switch; while in the manual on position, all other functions of this circuit are disabled.
  • a decision 102 is made whether the mode switch has been pressed and the hours display blinking; else a manual on/off switch subroutine beginning with decision 140 is entered. If decision 102 is yes, a decision 104 is made whether the change switch has been pressed and the hour entered; if yes, a decision 106 is made whether the mode switch has been pressed again, else the decision 106 is made directly whether the mode switch has been pressed again.
  • decision 106 When decision 106 is yes, a decision 108 is made whether the change switch has been pressed and minutes entered; if yes, a decision 110 is made whether the mode switch has been pressed, a "DISABLE" message displayed and hour-s flashing; else decision 110 is made directly.
  • decision 110 is yes, the mode switch has been pressed again, a "DISABLE” message displayed and the disable hour display blinking, a decision 112 is made whether the change switch has been pressed and the disable hour entered; if yes, a decision 114 is made whether the mode switch has been pressed, the "DISABLE” message displayed and the disable minutes display blinking, else the decision 114 is made directly.
  • decision 114 is yes, a decision 116 is made whether the change switch has been pressed and the disable minutes entered; if yes, decision 118 is made whether the mode key has been pressed an "ENABLE" message displayed and the enable hours display blinking, else decision 118 is made directly.
  • decision 120 is made whether the change switch has been pressed and enable hours entered; if yes, a decision 122 is made whether the mode key has been pressed, the "ENABLE" message displayed and the enable minutes display blinking, else decision 122 is made directly.
  • decision 122 is yes, a decision 124 is made whether the change switch has been pressed and the enable minutes entered, if yes, a decision 126 is made whether the mode switch has been pressed a "MESSAGE" message displayed and the disabled message display blinking, else the decision 126 is made directly.
  • decision 128 is made whether the change key has been pressed and the disable message selected; if yes a decision 130 made whether the mode switch has been pressed and the first letter of the name display blinking; else decision 130 is made directly.
  • a decision 132 is made whether the change key has been pressed and a first letter entered. If decision 132 is yes, a decision 134 is made whether the mode switch has been pressed and the next letter position blinking; else decision 134 is made directly. If decision 134 is yes, a decision 136 is made whether the change key has been pressed and the next letter entered. When decision 136 is yes, a decision 138 is made whether the mode key has been pressed and the last position entered; else decision 138 is made directly. When decision 138 is yes, return is made to start, else return is made to step 134 and steps 134, 136 and 138 repeated until decision 138 is yes and return is made to start (normal operation) .
  • the manual on/off switch subroutine begins with the decision 140 as to whether the manual on/off switch is in the on position; if yes, an instruction 142 is issued to override the mode, disable doorbell, and display selected message; else an instruction 144 is issued to return to start 100.
  • instruction 142 is issued, a decision 146 is continuously made to determine whether the manual on/off switch has been pressed again; if yes, return is made to start, else the decision 146 is continuously made until the decision is yes and return is made to start for normal operation.
  • FIG. 5 A circuit diagram of another embodiment of the invention is shown in Fig. 5.
  • This embodiment has the advantage that the occupant can "program" the message by speaking into a microphone to generate a stored message. The stored message is later played back when the doorbell switch is pushed. Thus, this embodiment can be sold or used in various countries where different languages are spoken. Since there is no pre-programmed message, exactly the same circuitry can be used in all languages.
  • the embodiment shown in Fig. 5 does not include a timer, the speech storage and retrieval circuitry disclosed can be used in place of the message display 18 and tone generator 36 shown in Fig. 2 of the previous embodiment.
  • illustrative embodiment As shown in Fig. 5, electrical power is applied to the electronic doorbell from the existing house AC or DC power supply through existing house doorbell wiring.
  • Doorbell power supplies in various areas may be AC or DC voltage of varying magnitude and the existing wiring may have variable current carrying capacity.
  • normal operation of the doorbell pushbutton switch operates existing doorbell 500 by shorting existing wires 502 and 504 together. This short circuit removes power from the doorbell circuit when the circuit needs power to playback messages. Accordingly, the illustrative embodiment generates an internal DC voltage which is stabilized by an internal battery.
  • the illustrative doorbell can operate with virtually any voltage and wiring.
  • incoming electrical power (either AC or DC) is rectified to generate DC power by diodes CR1-CR4 which are connected as a full-wave bridge rectifier. Due to the rectifier circuit, even if the doorbell is connected to DC power, it is impossible to connect it with improper polarity.
  • the pulsing DC power generated by diode bridge CR1-CR4 is clipped to a predetermined voltage level by resistor R5 and Zener diode CR5.
  • the clipped voltage is used to continuously trickle charge nickel-cadmium battery BAT1 through resistor R4.
  • Resistor R4 is set to provide a current of 1/100 of the battery capacity, to allow for continuous charging.
  • the resulting voltage is a regulated voltage that will always be available.
  • the regulated voltage is reduced to a final value by series-connected diode CR6.
  • the resulting final voltage on line 530 is then used as needed to power the electronic doorbell circuits.
  • a light-emitting diode (LED) 506 is connected across wires 502 and 504.
  • the small current which flows through, and activates, LED 506 is not sufficient to activate doorbell 500, but LED 506 illuminates the doorbell pushbutton switch SWIB.
  • switch SWIB When switch SWIB is pressed, the LED 506 will be shorted by switch SWIB and LED 506 will go out.
  • the higher current flow through switch SWIB, wires 502 and 504 and relay contact 508 activates doorbell 500. This operation is identical with conventional illuminated, mechanical doorbell buttons.
  • Relay RLY1 is used to silence existing bell 500 when desired by the occupant.
  • Relay is an AC relay powered by the unregulated pulsing DC output of rectifier bridge CR1-CR4.
  • the doorbell button closes switches SW1A and SWIB which are mechanically ganged together. Simultaneously, the occupant momentarily presses either pushbutton switch SW4 switch (BELL ON), or switch SW3 (BELL OFF).
  • NAND gate 510 When switch SW3 has been pressed to silence bell 500, a "low” ground signal passes through closed switch SW1A and closed switch SW3 and is applied to one input of NAND gate 510 The output of NAND gate 510 immediately becomes “high” in response. This "high” signal is provided to one input of NAND gate 512 and, in conjunction with a “high” present at the other input of NAND gate 512 forces its output “low”. This "low” output is thereupon provided to one input of NAND gate 510 and holds its output “high” even when the doorbell buttons are released. NAND gates 510 and 512 thus act as a flip-flop memory circuit.
  • NAND gate 512 The "low” output of NAND gate 512 is provided to NAND gates 514 and 516 which act as buffers in order to generate a higher current output to drive relay RLY1. In response to the "low” input, gates 514 and 516 generate a "high” output prevents relay RLY1 from operating. Since relay RLY1 has a normally-open contact 508 in series with doorbell switch SW13, current cannot flow to doorbell 500 when a visitor later presses the doorbell switch SWIB.
  • a spoken message is processed by integrated circuitry which first converts the audio message into digital signals.
  • the digital signals can then be stored in an inexpensive digital memory until playback.
  • the stored digital signals are used to drive a speech synthesizer which generates an audio playback announcement.
  • the general arrangement of the digital circuitry is shown in the block diagram form in Fig. 6.
  • the record and playback circuitry 600 consists of speech encoder circuit 602, digital memory 604, speech synthesizer 606, control circuit 608 and address generator 610.
  • the playback and record mode of the circuit is controlled by the signal on the P/R line 616. A "low” signal on this line places the circuit in “record” mode and a "high” signal on Line P/R places the circuit in the "playback" mode.
  • a "low” signal on line 616 is applied to the enable input EN of the speech encoder circuit which "low” signal enables the chip.
  • the "low” signal on line 616 is also inverted by inverter 612 and applied as a “high” signal to disable speech synthesizer circuit 606 which is used during the playback mode of operation.
  • the "low” signal is further applied to to the control circuit 608, via line 630, which "low” signal informs control circuit 608 that record mode is desired.
  • control circuit 608 places a signal on line 626 which signal is applied to the read/write (R/W) input of memory 604 causing the memory to be placed in a write mode.
  • Control circuit 608 also controls address generator 610 to generate address signals which are applied to the memory address inputs of memory 604 and applies a "high" signal on the end-of-message line (EOM) 622 to indicate that recording has started.
  • EOM end-of-message line
  • Speech encoder 602 receives analog audio signals on line 614 from a microphone (not shown in Fig. 6). Encoder 602 samples the audio signals and generates a digital word on data bus 632 which provides the digital signals to the data inputs of memory 604. Although bus 632 is shown as a single heavy line, typically it would consist of a plurality of signal lines since the digital words generated by encoder 602 have multiple bits. When encoder 602 has placed a digital word on data bus 632 it signals control circuit 608 via line 620.
  • control circuit In response to the signals from encoder 602, control circuit pulses memory strobe line 627 causing the digital word on bus 632 to be stored in memory 604 at the address generated by address generator 610. Control circuit 608 then controls address generator 610 to generate another address for the next digital word.
  • a "high” signal is placed on the playback/record line 616.
  • This "high” signal is provided to the enable input of encoder circuit 602 to disable the circuit.
  • the "high” signal on line 616 is also inverted by inverter 612 and applied as a “low” signal to the enable input (EN) of speech synthesizer circuit 606 to enable the circuit.
  • the "high” signal is also applied, via line 630, to control circuit 608 to place the control circuit in the playback mode.
  • playback is initiated by a "low” signal received at the chip enable input CE*.
  • control circuit 608 places a signal on line 626 which signal is applied to the read/write input (R/W) of memory 604 to place the memory in a read state.
  • Control circuit 608 also controls address generator 610 to generate address signals for retrieving the first digital word.
  • Control circuit 608 then pulses strobe line 627, causing memory 604 to place the stored digital word at the location indicated by the address signals onto data bus 632.
  • the digital signals on bus 632 are applied to speech synthesizer 606.
  • synthesizer 606 In response to these signals synthesizer 606 generates corresponding audio signals on the AUDIO OUT line 624.
  • synthesizer 606 signals control circuit 608 via line 634.
  • Control circuit 608 thereupon control address generator to generate the next address so that the next stored digital word can be retrieved from memory 604. Operation continues in this manner with sequential digital words being retrieved from memory 604 and converted to speech signals by synthesizer 606 until the entire message has been read out of memory 604 as indicated by reading the entire message out or by reading out the stored end-of-message marker.
  • a preferred playback and record circuit consisting of all the components shown in Fig. 6 plus input and output audio amplifiers is sold as a single integrated circuit designated as an "Integrated Voice Recorder (IVR) manufactured by Information Storage Devices, 2332B Walsh Avenue, Building G, Santa Clara, California 95051.
  • IVR Integrated Voice Recorder
  • the occupant in order to record a message which will be announced to a visitor when switches SWIB and SWIA are closed by pressing the doorbell button, the occupant simultaneously presses record pushbutton switch SW2 and the doorbell button which closes switch SWIA. While holding both switches closed, the occupant speaks into microphone 520.
  • Microphone 520 connects from power line 530 to the microphone input MIC of circuit 550 through DC blocking capacitor Cl.
  • the MIC input is connected to an internal audio amplifier whose output appears at the ANAOUT output.
  • Capacitor C3 is used to connect the amplified analog signal to the ANAIN input of circuit 550 which is the inp ⁇ t to the analog recording logic in circuit 550.
  • switch SW2 places a "low” on the playback/record (P/R) input of the record/playback circuit 550.
  • the "low” signal places the playback/record circuit into a 'playback” mode.
  • Closed switch SWIA provides an “enable” signal to the chip enable input CE* of circuit 550 which, as previously described above, starts a recording operation.
  • circuit 550 places a "high” signal on the EOM end-of-message output when recording.
  • the "high” signal on the EOM output is provided to transistor Ql via resistor R6.
  • the "high” signal from the EOM output turns transistor Ql “on”, allowing current to flow through Ql to LED 552, in turn, activating LED 552.
  • the resulting light from LED 552 gives the occupant a visible indication that a recording is being made.
  • Resistor R2 and capacitor C2 make up an R/C network which is used to generate an automatic gain control voltage for circuit 550 if the aforementioned IVR circuit is used. As the occupant speaks louder during message recording, the gain of the input amplifier will be decreased. As the occupant speaks softer, the gain will be increased correspondingly.
  • an output speaker 560 can be connected directly to speaker outputs SP.

Abstract

Un système (10) de sonnette programmable comprend une commande (12) de sonnette fonctionnant sur batterie, destinée à être connectée en série à un bouton-poussoir de sonnette existant dans un circuit de sonnette résidentiel. Dans un premier mode de réalisation, la commande de sonnette comporte un affichage (18) à cristaux liquides visuel, lequel peut afficher un message parmi une pluralité de messages. L'utilisation d'une horloge machine (52) interne, permet à l'occupant de la résidence de programmer la commande (34) à un intervalle de temps pendant lequel la sonnette normale (50) est deconnectée du commutateur de la sonnette. Pendant cet intervalle de temps, ladite commande (12) de sonnette émet une alarme sonore et affiche le message sélectionné lorsqu'un visiteur presse le bouton-poussoir de la sonnette. Un second mode de réalisation met en ÷uvre un circuit (550) d'enregistrement/lecture numérique permettant à l'occupant d'enregistrer un message audible et de stocker le message enregistré sous forme de signaux numériques. Un message audible est émis à partir des signaux numériques stockés lorsqu'un visiteur presse le bouton-poussoir de la sonnette.
PCT/US1989/004111 1989-09-18 1989-09-19 Commande de sonnette programmable WO1991004551A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40861389A 1989-09-18 1989-09-18
US408,613 1989-09-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2265248A (en) * 1992-03-11 1993-09-22 Marcus Carre Entry monitoring apparatus.
GB2309118A (en) * 1996-01-12 1997-07-16 Amanda Teresa Smith A doorbell answering system
GB2404777A (en) * 2003-08-01 2005-02-09 Stuart Richard Vint Recordable sound doorbell

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343009A (en) * 1941-10-06 1944-02-29 Hall John Albert Doorbell switch, annunciator, and chime
US3964058A (en) * 1974-05-28 1976-06-15 Winston Billy G Do not disturb doorbell
US4326276A (en) * 1979-12-04 1982-04-20 Scovill Inc. Musical door chime preferably also combined with a clock for annunciating the time
US4715060A (en) * 1985-07-15 1987-12-22 Lipscher Bernard N Door message apparatus with telephone answering device
US4868540A (en) * 1987-07-15 1989-09-19 Housley Todd B Programmable doorbell control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343009A (en) * 1941-10-06 1944-02-29 Hall John Albert Doorbell switch, annunciator, and chime
US3964058A (en) * 1974-05-28 1976-06-15 Winston Billy G Do not disturb doorbell
US4326276A (en) * 1979-12-04 1982-04-20 Scovill Inc. Musical door chime preferably also combined with a clock for annunciating the time
US4715060A (en) * 1985-07-15 1987-12-22 Lipscher Bernard N Door message apparatus with telephone answering device
US4868540A (en) * 1987-07-15 1989-09-19 Housley Todd B Programmable doorbell control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2265248A (en) * 1992-03-11 1993-09-22 Marcus Carre Entry monitoring apparatus.
GB2265248B (en) * 1992-03-11 1996-10-02 Marcus Carre Entry monitoring apparatus
GB2309118A (en) * 1996-01-12 1997-07-16 Amanda Teresa Smith A doorbell answering system
GB2404777A (en) * 2003-08-01 2005-02-09 Stuart Richard Vint Recordable sound doorbell

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Publication number Publication date
AU5160890A (en) 1991-04-18

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