US3810170A - Alarm system - Google Patents
Alarm system Download PDFInfo
- Publication number
- US3810170A US3810170A US00295241A US29524172A US3810170A US 3810170 A US3810170 A US 3810170A US 00295241 A US00295241 A US 00295241A US 29524172 A US29524172 A US 29524172A US 3810170 A US3810170 A US 3810170A
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- United States
- Prior art keywords
- source
- set forth
- lamps
- lamp
- emergency
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 230000011664 signaling Effects 0.000 claims abstract description 26
- 230000000007 visual effect Effects 0.000 claims abstract description 16
- 208000032041 Hearing impaired Diseases 0.000 claims description 13
- 238000005286 illumination Methods 0.000 claims description 13
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 206010011878 Deafness Diseases 0.000 abstract description 21
- 239000003990 capacitor Substances 0.000 description 12
- 239000000779 smoke Substances 0.000 description 8
- 230000000994 depressogenic effect Effects 0.000 description 5
- 229910052754 neon Inorganic materials 0.000 description 4
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
- 210000001328 optic nerve Anatomy 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
Definitions
- the invention is especially suitable for use in a dormitory or other housing for deaf and hearing-impaired persons and provides a central system for calling such persons at their respective rooms or in corridors, rest areas, and the like, which system will alert all rooms and occupants of fire, smoke, or other potential danger or emergency conditions.
- the invention is also applicable to provide a signalling or call system as an auxiliary to or in lieu of audible signalling systems, as in applications where quiet must be maintained.
- a high intensity lamp such as a strobe lamp
- a visual signalling system in accordance with this invention contains a source of intense illumination. Means are provided for applying power to the source when enabled. Sensing means are provided which are responsive to certain events, as for example, fire, emergency conditions, or calls of various types. Control circuits are operated by the sensing means for enabling the power applying means to operate the source of high intensity illumination whereby to arouse any persons, especially deaf or hearing-impaired persons in'the vicinity ofthe illumination source, and to inform them of the call condition.
- FIG. 1 is a plan view of an indicator panel which is used in a system provided in accordance with an embodiment of the invention
- FIG. 2 is a block diagram of the system embodying the invention which utilizes the indicator panel shown in FIG. 1;
- FIG. 3 is a simplified schematic diagram of the sensing, power distribution and control circuits of the system shown in FIG. 2; and v v FIG. 4 is a schematic diagram of circuitry for operating the panel illustrated in FIG. 1 when power is applied thereto through the circuits and systems illustrated in FIGS. 2 and 3.
- FIG. 1 there is shown a panel which may be installed in each room ofa building, such as a dormitory, occupied by deaf or hearingimpaired persons. This may be the various sleeping rooms of the dormitory. Other panels of similar design may be installed in the rest rooms, corridors, class rooms, libraries, dining halls, or other rooms where the I attention of the occupants is desired.
- the illustrated panel is one of the room signal indicator panels 10.
- the four lamps are mounted in the panel. These are a red incandescent lamp 12, a green incandescent lamp l4,
- the red lamp 12 indicates a tire or other emergency condition
- the green lamp l4 indicates a call at the door of the room as when a visitor presses the room call push button at the door
- the amber lamp l6 is operated by the building attendant or desk clerk.
- the desk in the lobby of the building hasa control console containing push button or other call control system. When the .push button at the desk for a particular room is depressed, the amber light in the panel 10 for that room is illuminated.
- the lamp 18 is a strobe lamp designated by the letters WS which connotes white strobe.
- This strobe lamp may be a Xenon lamp of the type used in photo-flash equipment.
- the lamp when flashed constitutes an intense source of illumination. It has been found to excite the optic nerves so as to arouse the attention of persons in the vicinity of the illumination.
- the occupant of the room then has his attention brought to the room signal indicator panel 10.
- the appropriate call condition is then brought to his at tention (viz., a fire or emergency, a visitor at the door, or visitor at the desk of the lobby of the building).
- the exemplary visual signalling system as a whole is illustrated in FIG. 2.
- the sensors 20 detect fire or smoke and may be the sensors regularly installed in the building as part of the fire alarm system or sprinkler system. These sensors control a separate emergency power supply 22, which applies emergency power, separate from any of the regular lighting power systems of the building, through a time delay unit (T.D.U.) 24 to a power distribution system 26.
- the time delay unit is a timer, either electronic or mechanical, which permits power to be applied from the emergency power sources 22 to the power distribution system 26 for a period of time, say minutes, after the emergency power is applied upon actuation of the sensors 20.
- time delay unit automatically shuts off the power and then if the sensor is still activated permits emergency power to be applied for another predetermined, say 5 minutes, time period.
- a suitable time delay unit may be of the type manufactured by Chronologics, Inc., of Rochester, New York, Model No. PT- 100.
- the power distribution system provides for sources of voltage or power lines for each room signal indicator a through l0n, and the other signal indicators which by way of example are indicated as hall or corridor signal indicators 28a through 28n.
- these power lines are l volts AC for operating the strobe light 18, and 24 volts AC (an exclusive line) for actuating the control circuits forthe emergency lamp l2 and the strobe lamp 1.8, a 24 volt DC line also for operating these control circuits, and a separate 24 volt AC line for operating portions of the control circuits for operating the green and amber lamps 14 and 16.
- the power distribution system 26 may be located in the basement of the building in a power cabinet.
- the system is connected to the control center 30 which is located in a console at the reception desk which may be in the lobby of the building.
- the desk is attended by a desk clerk or attendant who is a person having normal sight and hearing capabilities.
- the control center is equipped with indicators, such as lamps, which inform the attendant that the power distribution system, particularly the emergency power system, is operating properly in all of the rooms of the building. Accordingly, there are connections between the power distribution system 26 and the control center 30. There are also connections between both the power distribution system 26 and the control center 30 and the room signal indicators 10a through 10n, and the hall signal indicators 28a and 2&1.
- Each of the room signal indicators is equipped with control circuitry which will be described hereinafter in connection with FIG. 4.
- TTY teletypewriters
- the strobe lamp will be operated to arouse and obtain the attention of the occupant and additional lamps will be provided on the indicator panels 10 to call the occupants attention to a message either on the video phone or teletypewriter.
- the volt AC line will provide power for the video phones 32a to 32n, and teletypewriters 34a to 34n.
- the video phone and teletypewriters may be of the conventional type which is supplied by the telephone utility companies under their established tariffs.
- FIG. 3 shows, in simplified schematic form, the emergency power circuits as well as the circuits of the power distribution system 26 and the control center 30 as are applicable to an exemplary room signal indicator l0. lt will be appreciated that similar circuits or groups of circuits may be provided for each room signal indicator or groups of room signal indicators as for example as may be located in rooms along one corridor'or-one floor of the building. I
- the sensors 20 may be the temperature sensors 20a or smoke sensors 20!; of'the fire alarm system installed in the building.
- the temperature sensors may be thermo couples which produce a change in resistance or the closure of a switch contact when temperature rises above a certain threshold.
- the smoke sensors 20b may be photo cells interposed in a light beam which may be interrupted by smoke to increase the resistance in a current path to a relay driver amplifier 3 6.
- temperature sensors 200 may be connected to similar relay driver amplifiers 38.
- the amplifiers are operated by the l 15 volt AC line in the emergencypower supply 22 which is separate from other power lines in the building.
- the relay drivers operate their respective relays Kl or K2.
- the relays are indicated by the letter K followed by a distinctive numeral.
- the contacts associated with each relay are designated by the relay designation followed by a numeral which connotes the contact.
- relay K1 has contact K-l-l associated therewith
- relay K2 has contact K-2-l associated therewith.
- the time delay unit contains another relay or electromagnetic contacter K3 which when actuated pulls in contacts K-3-l and K-3-2 which are in parallel with each other for greater current carrying capability. Contacts K-3-4 and K-3-5 are also closed to apply 115V AC power to the RSI 10 control circuits.
- the time delay unit interrupts the circuit to the contacter K-3 which drops out after a predetermined time period, say 5 minutes.
- the time delay unit will be retriggered and cause the contacter K-3 to be actuated from the l 15 volt AC line to an additional 5 minute period; However, if the alarm condition does not exist after the 5 minute operating period the contacter K-3 will remain dropped out and alarms or emergency alerts will not continue to be indicated.
- step-down transformer X provides a 24-volt AC emergency power source which serves to enable the strobe lamp and red emergency lamp l8 and 12 in the panels of the room signal indicators.
- a lamp 40 on the power cabinet is illuminated to indicate an emergency condition associated with the particular room indicator, there being a separate transformer X for each room signal indicator panel 10 or a group of room signal panel indicators.
- a lamp 42 in the control center which is connected to the transformer X is also illuminated indicating to the attendant'an emergency condition associated with a particular room signal indicator or group of room signal indicators.
- a normally open contact K-4-l of the relay K4 and a normally closed contact K-S-l of the relay K-S are connected in series across one side of the l volt AC emergency line.
- a fire-emergency lamp 46 and buzzer 48 In the control center there is located a fire-emergency lamp 46 and buzzer 48.
- a call indicator buzzer and lamp 50 and 52 There is also located and associated with each lamp 46 and buzzer 48 a call indicator buzzer and lamp 50 and 52. Under emergency conditions when the relay K-3 pulls in, contact K-4-l will close and contact K-S-l will open. This will cause the failure indicator lamp and buzzer 52 and 50 to sound.
- the fire emergency lamp and buzzer 46 and 48 will be disconnected from the line, thus indicating that power is being applied across the secondary of the transformer X and the room signal indicator emergency circuits are operating.
- the fire and emergency lamp and buzzer 46 and 48 as well as the failure indicator lamp and buzzer 52 and 50 will both sound. This provides a warning to the attendant at the control center that there is a failure in a particular room signal indicator or group of room signal indicators. The attendant then will warn the occupants of the rooms having filed room signal indicators by some other means.
- the emergency power source also connects the 115 volt AC line through separate step-down transformers X and X to provide separate sources of voltage, particularly the 24 volt AC source which is connected to terminals T and T which are applied to lines to the individual room signal indicators or groups of room signal indicators.
- the transformer X is connected to a rectifier 54 which provides 24 volt DC at terminals T and T,. These terminals are also connected to lines which go to the room signal indicators and hall signal indicators.
- FIG. 4 illustrates the circuitry associated with each room signal indicator.
- the hall signal indicators may be similar except that the circuits associated with the green and amber lamps need not be included in the hall signal indicator circuits.
- the l 15 volt lines from terminals T, and T, are connected to a circuit for operating the strobe lamp 18.
- the circuit includes a step-up transformer 59.
- the voltage across the secondary of the transformer 59 is rectified by halfwave rectifier diode 60 and filtered by a resistor'capacitor filter including the resistor 62 and a filter capacitor 64.
- the DC voltage then appears across a voltage divider resistor 66.
- a capacitor 68 and a transformer 70 are connected to the trigger electrode of the lamp 18.
- a pulse which is stepped up in the transformer 70 is generated each time a silicon controlled rectifier (SCR) 72 is triggered.
- the capacitor 68 which has been charged, by virtue of being connected through the primary of the transformer 70 across a portion of the voltage divider 66, then discharges through the SCR 72 to produce the current pulse which is transformed by the transformer 70 into a high voltage pulse for triggering the strobe lamp 18.
- the trigger pulse for the SCR 72 is provided by closing different contacts K-7-2, K-9-l, and K-lO-l. Taking contact K-7-2 by way of example, which contact is closed in response to the deskcall or control center push button 74.
- Voltage from the lower tap 76 of the divider 66 (viz., the voltage across the capacitor 78) is applied to the trigger electrode of the SCR 72 and causes the SCR to conduct thereby producing the pulse which causes the strobe lamp to flash but once.
- a simi lar single-flash occurs when the contact K-9-1 is closed.
- a relaxation oscillator is provided. This oscillator includes a neon lamp 80 connected in series with a capacitor 82 and a resistor 84 across the lower portion of thevoltage divider 66 (viz., the capacitor 78). The time constant of the neon lamp circuits is adjusted so that the neon lamp will become conductive and provide trigger pulses to the SCR at a predetermined rate, say 30 pulses per minute, so long as the contact K-lO-l isclosed.
- a visitor at the-door of the room operates a door push button 92 which closes the circuit of the separate 24 volt AC line, thus illuminating the green lamp 14.
- a rectifier circuit 94 similar to the circuit containing the rectifier 86 resistor and capacitor 90 and 88 causes relay K-9 to pull in. This operates contact K-9-l which causes a single flash from the strobe lamp.
- the door push button will be repeatedly closed if attention of the room occupant is not obtained at once. Each closure will produce another flash of the lamp. By keeping the door push buttons depressed the green lamp will remain on.
- the attendant at the desk can call the attention of the person in a particular room operating'the control center push button 74 allocated to that room.
- Power is then applied from the 24 volt DC terminal T through relay K and normally close contact K-6-1 of another relay K-6.
- relay [(-7 pulls in it closes contacts K-7-3 and K-7-4 which applies 24 volts AC from terminals T. and T, across the amber lamp 16.
- the amber lamp, indicating a desk call is then illuminated on the room signal indicator panel.
- Contacts K-7-2 closes. Closure of contact K-7-2 triggers the strobe lamp l8 and causes a single flash.
- the control center push button 74 when depressed connects the 24 volt DC power line from terminals T,. to T, across the relay K-7 which is in series with the normally closed contact K-6-l.
- relay K-7-1 of relay [(-7 is also connected to terminal T, and therefore holds relay K-7 pulled in until relay K-6 operates.
- Relay K-6 is connected in a relaxation oscillator including a unijunction transistor 96. When the control center push button is depressed, capacitor 102 begins charging through resistor 100. When the emitter of unijunction 96 reaches its required voltage. unijunction 96 conducts, energizing the coil of relay K-6, opening contacts K-6-l which causes relay K-7 to drop out.
- the amber lamp comes on by virtue of contacts K-7-3 and K-7-4; it remains on until K-7 drops out. This period is variable by changing the time constant set by the resistor 100 and capacitor 102. Also, when the control center button is operated, the strobe light flashes only once by virtue of the contact K-7-2 which by closing allows the voltage at junction 76 of the voltage divider to be applied to the junction of the resistor 84, and capacitor 86, thus operating the S.C.R. 72 into conduction, and triggering the'strobe light 18.
- the rate of flashing of the At once by strobe lamp is an indication of the particular call condition whether a fire or emergency, a caller at the door of the room, or caller at the desk of the lobby of the building.
- a visual signalling system for areas adapted to be occupied by hearing-impaired persons which comprises:
- a high intensity lamp means providing a source of intense illumination disposed in the area to be occupied by the hearing-impaired persons, said source being of such intensity and duration to excite the optic senses of the hearing-impaired persons in the area,
- sensing means responsive to occurrence of certain events.
- said power applying means comprises a first source of voltage, and means operated by said first source for applying pulses successively to said strobe lamp when triggered.
- said power applying means includes a second source of voltage, and means operated by said second source of voltage for triggering said means operated by said first source, and for operating at least one of said plurality of second lamps.
- sensing means includes a fire detection device and wherein said means operated by said sensing means includes means operated by said device for providing said second source of voltage when fire is detected by said device.
- first time delay means connected between said device and said first source for disconnecting said first source from said power applying means for a predetermined period of time after said device detects a fire condition.
- said power applying means includes second time delay means for successively interrupting the operation of said independently operative triggering means, each interruption occurring after a certain time delay.
- the invention as set forth in claim 1 further comprising means for automatically, repetitively, flashing the source of intense illumination on and off.
- the invention as set forth in claim 11 further comprising means for illuminating the area with illumination spots of different color for providing different messages for the hearing-impaired persons in the. area.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Electromagnetism (AREA)
- Audible And Visible Signals (AREA)
- Alarm Systems (AREA)
Abstract
Description
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US00295241A US3810170A (en) | 1972-10-05 | 1972-10-05 | Alarm system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00295241A US3810170A (en) | 1972-10-05 | 1972-10-05 | Alarm system |
Publications (1)
Publication Number | Publication Date |
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US3810170A true US3810170A (en) | 1974-05-07 |
Family
ID=23136844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00295241A Expired - Lifetime US3810170A (en) | 1972-10-05 | 1972-10-05 | Alarm system |
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Country | Link |
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US (1) | US3810170A (en) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4227191A (en) * | 1978-02-21 | 1980-10-07 | Samuel Raber | Light emitting smoke detector |
FR2468170A1 (en) * | 1979-10-17 | 1981-04-30 | Siema Sa | Remote number displaying circuit - has input key-pad and microprocessor for controlling display of numbers on remote panel |
US4278966A (en) * | 1979-02-09 | 1981-07-14 | Control Technology, Inc. | Visual signaling system |
US4283657A (en) * | 1976-03-25 | 1981-08-11 | Lampiridae Associates | Exit illuminating system |
US4365238A (en) * | 1979-06-08 | 1982-12-21 | Adam Kollin | Visual signalling apparatus |
US4531114A (en) * | 1982-05-06 | 1985-07-23 | Safety Intelligence Systems | Intelligent fire safety system |
US4668935A (en) * | 1982-12-22 | 1987-05-26 | Mcdermott Julian A | Visual alarm reliability assurance system |
US4694281A (en) * | 1982-09-16 | 1987-09-15 | Mcdermott Julian A | Visual alarm apparatus |
US5019805A (en) * | 1989-02-03 | 1991-05-28 | Flash-Alert Inc. | Smoke detector with strobed visual alarm and remote alarm coupling |
US5045833A (en) * | 1989-05-30 | 1991-09-03 | Smith Edward R | Apparatus and system for alerting deaf persons |
US5177461A (en) * | 1988-11-28 | 1993-01-05 | Universal Electronics Inc. | Warning light system for use with a smoke detector |
US5446439A (en) * | 1993-03-26 | 1995-08-29 | Smartronics, Inc. | Emergency condition lighting controller |
US5559492A (en) * | 1993-09-24 | 1996-09-24 | Simplex Time Recorder Co. | Synchronized strobe alarm system |
US6243001B1 (en) * | 1998-11-10 | 2001-06-05 | Kobishi America | Variable intensity visual signaling system |
US20040080401A1 (en) * | 1993-09-24 | 2004-04-29 | Adt Services Ag | Building alarm system with synchronized strobes |
US20060255915A1 (en) * | 2005-05-13 | 2006-11-16 | Rae Steele | Light alert system for a pager |
US20070210900A1 (en) * | 1993-09-24 | 2007-09-13 | Stewart Albert J | Building alarm system with synchronized strobes |
US8659416B1 (en) | 2010-01-14 | 2014-02-25 | Victor M. Higgins | Instrument for detecting and alerting during an emergency situation |
US9500515B2 (en) | 2013-10-21 | 2016-11-22 | Mass Moment LLC | Multifunctional wearable audio-sensing electronic device |
Citations (6)
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US1771953A (en) * | 1929-08-17 | 1930-07-29 | William H Conklin | Device for transmitting intelligence |
US2047586A (en) * | 1931-02-20 | 1936-07-14 | Hixon Electric Co | Visible paging system |
US2982949A (en) * | 1956-03-06 | 1961-05-02 | Albert W Pivetz | Portable thermal alarm and signal system |
US3150359A (en) * | 1961-06-23 | 1964-09-22 | Peter J Hoey | Remote alarm indicator |
US3278895A (en) * | 1964-01-20 | 1966-10-11 | Charles E Pfund | Automobile signalling |
US3430224A (en) * | 1966-03-23 | 1969-02-25 | Coastal Dynamics Corp | Remote control plural lamp signaling system |
-
1972
- 1972-10-05 US US00295241A patent/US3810170A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1771953A (en) * | 1929-08-17 | 1930-07-29 | William H Conklin | Device for transmitting intelligence |
US2047586A (en) * | 1931-02-20 | 1936-07-14 | Hixon Electric Co | Visible paging system |
US2982949A (en) * | 1956-03-06 | 1961-05-02 | Albert W Pivetz | Portable thermal alarm and signal system |
US3150359A (en) * | 1961-06-23 | 1964-09-22 | Peter J Hoey | Remote alarm indicator |
US3278895A (en) * | 1964-01-20 | 1966-10-11 | Charles E Pfund | Automobile signalling |
US3430224A (en) * | 1966-03-23 | 1969-02-25 | Coastal Dynamics Corp | Remote control plural lamp signaling system |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4283657A (en) * | 1976-03-25 | 1981-08-11 | Lampiridae Associates | Exit illuminating system |
US4227191A (en) * | 1978-02-21 | 1980-10-07 | Samuel Raber | Light emitting smoke detector |
US4278966A (en) * | 1979-02-09 | 1981-07-14 | Control Technology, Inc. | Visual signaling system |
US4365238A (en) * | 1979-06-08 | 1982-12-21 | Adam Kollin | Visual signalling apparatus |
FR2468170A1 (en) * | 1979-10-17 | 1981-04-30 | Siema Sa | Remote number displaying circuit - has input key-pad and microprocessor for controlling display of numbers on remote panel |
US4531114A (en) * | 1982-05-06 | 1985-07-23 | Safety Intelligence Systems | Intelligent fire safety system |
US4694281A (en) * | 1982-09-16 | 1987-09-15 | Mcdermott Julian A | Visual alarm apparatus |
US4668935A (en) * | 1982-12-22 | 1987-05-26 | Mcdermott Julian A | Visual alarm reliability assurance system |
US5177461A (en) * | 1988-11-28 | 1993-01-05 | Universal Electronics Inc. | Warning light system for use with a smoke detector |
US5019805A (en) * | 1989-02-03 | 1991-05-28 | Flash-Alert Inc. | Smoke detector with strobed visual alarm and remote alarm coupling |
US5045833A (en) * | 1989-05-30 | 1991-09-03 | Smith Edward R | Apparatus and system for alerting deaf persons |
US5446439A (en) * | 1993-03-26 | 1995-08-29 | Smartronics, Inc. | Emergency condition lighting controller |
US5559492A (en) * | 1993-09-24 | 1996-09-24 | Simplex Time Recorder Co. | Synchronized strobe alarm system |
US7005971B2 (en) | 1993-09-24 | 2006-02-28 | Adt Services Ag | Building alarm system with synchronized strobes |
US20070210900A1 (en) * | 1993-09-24 | 2007-09-13 | Stewart Albert J | Building alarm system with synchronized strobes |
US20040080401A1 (en) * | 1993-09-24 | 2004-04-29 | Adt Services Ag | Building alarm system with synchronized strobes |
US6741164B1 (en) | 1993-09-24 | 2004-05-25 | Adt Services Ag | Building alarm system with synchronized strobes |
US6954137B2 (en) | 1993-09-24 | 2005-10-11 | Adt Services Ag | Building alarm system with synchronized strobes |
US20060017556A1 (en) * | 1993-09-24 | 2006-01-26 | Adt Services Ag | Building alarm system with synchronized strobes |
US5886620A (en) * | 1993-09-24 | 1999-03-23 | Simplex Time Recorder Company | Building alarm system with synchronized strobes |
US20060170563A1 (en) * | 1993-09-24 | 2006-08-03 | Simplexgrinnell Lp | Building alarm system with synchronized strobes |
US20060176168A1 (en) * | 1993-09-24 | 2006-08-10 | Stewart Albert J | Building alarm system with synchronized strobes |
US6243001B1 (en) * | 1998-11-10 | 2001-06-05 | Kobishi America | Variable intensity visual signaling system |
US20060255915A1 (en) * | 2005-05-13 | 2006-11-16 | Rae Steele | Light alert system for a pager |
US8659416B1 (en) | 2010-01-14 | 2014-02-25 | Victor M. Higgins | Instrument for detecting and alerting during an emergency situation |
US9500515B2 (en) | 2013-10-21 | 2016-11-22 | Mass Moment LLC | Multifunctional wearable audio-sensing electronic device |
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AS | Assignment |
Owner name: ZINSMEISTER, MILDRED F. Free format text: LETTERS OF TESTAMENTARY;ASSIGNOR:ZINSMEISTER, ROLAND F.;REEL/FRAME:004700/0724 Effective date: 19771219 Owner name: PATENT EDUCATIONAL TRUST, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ZINSMEISTER, MILDRED F., EXECUTRIX OF THE ESTATE OF ROLAND F. ZINSMEISTER, DEC D;REEL/FRAME:004700/0725 Effective date: 19780224 Owner name: ZINSMEISTER, MILDRED F.,STATELESS Free format text: LETTERS OF TESTAMENTARY;ASSIGNOR:ZINSMEISTER, ROLAND F.;REEL/FRAME:004700/0724 Effective date: 19771219 Owner name: PATENT EDUCATIONAL TRUST,STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ZINSMEISTER, MILDRED F., EXECUTRIX OF THE ESTATE OF ROLAND F. ZINSMEISTER, DEC D;REEL/FRAME:004700/0725 Effective date: 19780224 |