US3770364A - Burner sequence programmer - Google Patents

Burner sequence programmer Download PDF

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Publication number
US3770364A
US3770364A US00209685A US3770364DA US3770364A US 3770364 A US3770364 A US 3770364A US 00209685 A US00209685 A US 00209685A US 3770364D A US3770364D A US 3770364DA US 3770364 A US3770364 A US 3770364A
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United States
Prior art keywords
actuator
contacts
states
state
burner
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Expired - Lifetime
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US00209685A
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English (en)
Inventor
L Walbridge
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BLOOM-1 Inc A CORP OF
Kidde Inc
Kidde Fenwal Inc
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Walter Kidde and Co Inc
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Assigned to KIDDE, INC. reassignment KIDDE, INC. MERGER (SEE DOCUMENT FOR DETAILS). FILED MARCH 31, 1988, DELAWARE Assignors: HIMP-2 INC., HIMP-2 INC. (CHANGED TO)
Assigned to FENWAL INCORPORATED, A CORP. OF DE reassignment FENWAL INCORPORATED, A CORP. OF DE NUNC PRO TUNC ASSIGNMENT (SEE DOCUMENT FOR DETAILS). Assignors: KIDDE, INC.
Assigned to BLOOM-1 INC., A CORP. OF DE reassignment BLOOM-1 INC., A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: 3/31/88, DELAWARE Assignors: KIDDE INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F23N5/126—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/206—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors

Definitions

  • a burner sequence programmer which provides automatic spark generation Y and flame sensing; the provision of such apparatus which will automatically provide at least one attempt at obtaining reignition; the provision of such a system which will automatically terminate the generation of spark generating impulses when ignition is obtained; the provision of such a system which will proceed to a stable state if ignition is satisfactorily obtained; the provision of such a system which will proceed to a final lock-out state, e.g. necessitating manual resetting, if there is a component failure which requires service at the burner; the provision of such apparatus which is highly reliable; and the provision of such apparatus which is relatively simple and inexpensive.
  • Other objects and features will be in part apparent and in part pointed out hereinafter.
  • apparatus operates to program the sequence of operations of a burner, e.g. such as the burner employed in a domestic I stove broiler, the burner being provided with fuel means which includes a plurality of contacts and an electrically energizable actuator.
  • the actuator when energized, proceeds progressively through a succession of predetermined states with corresponding contacts being operated in each state.
  • the actuator is deenergized, it .returns back through the previous states to its initial state.
  • a first circuit is responsive to the operation of the contacts in the initial state of the actuator for energizing the actuator, the actuator being deenergized thereby when a second predeterminedstate is entered.
  • An ignition circuit responds to the operation of the contacts in the-second or ignition state to open the fuel valve and to generate spark-producingimpulses adjacent the burner.
  • a sensing circuit is provided which is responsive only to the presence of a flame at the burner for energizing the actuatorindependently of the first circuit means. If ignition is not obtained, the de-ene-rgized actuator moves to a standby state requiring a momentary loss of power to again try for ignition. However, if a flame is satisfactorily produced, the actuator proceeds to a further, intermediate state in which fuel flow is maintained.
  • the actuator alternates between these states at some nominal average level of energization. In the event of certain circuit failures the actuator becomes continuously energized and automatically moves to a final or lock-out state requiring manual reset.
  • FIG. 1 is a schematic circuit diagram of programming apparatus of the present invention, together with an associated burner construction diagrammatically illustrated;
  • FIG. 2 illustrates actuator 31 in an unbiased position.
  • Burner 11 may, for example, comprise the broiler burner of a conventional domestic cooking stove or other similar appliance burner.
  • Fuel e. g. natural gas
  • the solenoid winding being indicated at 15.
  • Mounted adjacent burner 11 are a pair of electrodes 17 and 19 which, as explained hereinafter, function as both spark-generating electrodes and also as a flamesensing means.
  • at least one of the electrodes is preferably mounted relative to burner 11 so as to be immersed in the ionized gases which are generated when a flame is present at the burner.
  • Spark transformer T1 also includes a primary winding W2 which is interconnected with a spark impulse generating circuit. One end of winding W2 is connected,
  • the lead 21 may be considered to be the common or reference potential.
  • Winding W2 and capacitor C1 together are shuntedby a SCR (Silicon Controlled Rectifier) Q1, the anode of the SCR being connected to the remaining end of winding W2 through 'a diode D1 which is shunted by a resistor R1.
  • SCR Silicon Controlled Rectifier
  • capacitor C1 is provided with charging current through a diode D2 which charges this capacitor through resistor R1 and the transformer primary winding, the rate of charging being determined by resistor R1. The charging takes place over a number of am. supply cycles in the spark-generating mode of operation.
  • a timed pulse signal for triggering the SCR is obtained by means of a relaxation oscillator comprising a neon glow tube NEl, which functions as a voltage breakdown device, a timing capacitor C2, and a charging resistor R2.
  • Capacitor C2 is charged from the potential stored on capacitor C1 through resistor R2.
  • an electrode mounted adjacent a burner can provide a flame-sensing function in that the ionized gases present in the flame will rectify an a.c. voltage present on the electrode.
  • this rectification function is represented by a diode, designated D8, which is connected between the electrode l9 and the burner 11.
  • the burner is assumed to be grounded as indicated at 22.
  • an a.c. voltage which is at certain times present at the gate of SCR O1 is coupled to the electrode 17 through a capacitor C3 opposite the SCR gate.
  • This d.c. component is filtered by means of a resistor R6 and a capacitor C4 and is applied to the cathode of a complementary SCR Q2.
  • the complementary SCR is schematically shown in the same manner as a programmable unijunction transistor (PUT) which can generally be used as a replacement for a complementarySCR;
  • PUT programmable unijunction transistor
  • the complementary SCR performs the function of periodically dumping an accumulated signal, if present, into the gate circuit of the SCR Q1.
  • the gate of the complementary SCR Q2 is connected directly to the cathode of SCR Q1 while its anode is connected thereto through a capacitor C5 which is shunted by a diode D3.
  • Current for turning on the SCR Q2 is provided by the power line through the resistor R8. Capacitor C5 causes this current to lag the line voltage slightly as discussed further hereinafter.
  • the circuitry thus far described operates in conjunction with a switching assembly employing a bi-metal element.
  • this switching assembly is indicated generally at 30, with a bi-metal leaf actuator 31 and a plurality of flexible conductor leafs 33, 34, 35, 36 and 37 having ends mounted in an insulator block 40.
  • a resistance heater for the bi-metal element is indicated at RH. While a-separate heater is illustrated, it may be understood that under certain circumstances integral heating might also be employed. If desired, bimetal element 31 may be compensated for ambient temperature variations in conventional manner.
  • Bi-metal element 31 is shaped so that, at normal or ambient temperature, this actuator element is in its right hand position, i.e. as illustrated.
  • the actuator itself carries a contact 42, which, in this right hand position, engages and biases slightly to the right contact 43 on flexible conductor leaf 33. Heating of the bi-metal actuator 31 causes it to flex or swing to the left, leaving the fixed contact 43 of leaf 33 after its spring bias is eliminated by a small initial movement.
  • a series of contacts 44-47 are successively engaged, these latter contacts being mounted, respectively, on the leaf-spring support conductors 34-37 so that as each contact is engaged it can itself move to the left so as to pick up any further contacts in the series.
  • the positioning of the first contact 44 is such that it is not engaged immediately after the actuator contact 42 leaves the fixed contact 43.
  • retained thermal energy in the heater RH will cause some motion overshoot of the actuator 31 after the heater RH is de-energized.
  • the magnitude of overshoot is, of course, dependent upon the level of thermal energy retained by the heater RH.
  • the thermal energy accumulated by the heater RH during the period required for the actuator 31 to break the contacts 42 and 43 produces an overshoot that insures engagement of contacts 42 and 44.
  • a shortened heating period is required to move the actuator out of engagement with the leaf spring 33.
  • a pair of supply leads L1 and L2 provide a.c. power at conventional domestic potentials, e.g. 1 15 volts a.c. at 60 Hz. It is assumed lead L1 is the neutral or grounded lead as indicated. Lead L2 is connected, through a main ON/OFF switch S1 and a fuse F1, to the bi-metal actuator 31 and its contact 42.
  • the switch 81 may, for example, be a thermostatic temperature control switch.
  • the fixed contact 43 which is engaged by the supply contact 42 when the actuator 31 is cool, is connected to supply current to the spark pulse-generating circuit through the diode D2 and also to one side of the actuator heater RH. The other side of the heater is connected, through a dropping resistor R9, to the common lead L1.
  • Contact 44 is connected to the lead 21 which, as noted previously, constitutes the common lead for the spark-generating ignition circuitry.
  • Contact 44 is also connected, through a diode D5, to the fuel valve solenoid winding 15. This winding is shunted by a further diode D6 which absorbs the inductive surge in conventional manner.
  • Contact 45 is connected, through a bleed resistorR 10, to the timing capacitor C2, which contact 36 is connected to the cathode of the complementary SCR Q2.
  • the last contact in the sequence 47 is connected, through a resistor R l l, to the common lead L1.
  • Resistor R 11 is of relatively low value for purposes described hereinafter.
  • this circuit is substantially as follows.
  • the switch S1 When the switch S1 is initially closed, the heater RH is directly energized through the engagement existing between contacts 42 and 43. This is the initial state of the switching assembly.
  • contact 43 is connected to diode D2, energization of the sparkgenerating circuitry is prevented by the blocking action provided by diode D5 which also prevents energization of the fuel valve solenoid winding 15.
  • the solenoid winding is energized, through the diode D5, during those half cycles in which the lead L2 is negative with respect to lead L1.
  • current is provided, through the diode D2, the heater RH, and the resistor R9, to the spark pulse-generating circuit.
  • This circuit is thus energized to generate igniting sparks, as described previously,'between the electrodes 17 and 19. While the spark-generating circuitry draws a slight current load through the" heater RH, this current is not sufficient to prevent the bi-metal actuator from cooling.
  • the actuator 31 will begin to cool and move back toward the contact 43 which is in the unbiased position shown in FIG. 2.
  • current flow begins in the heater RH to again initiate heating of the bi-metal actuator 31 which, accordingly, reverses itsdirection of movement.
  • the time required to break contacts 42 and 43 is substantially less than upon original start-up because of the unbiased po-' sition of the leaf 33. For this reason, less thermal energy is accumulated by the heater RH resulting in a smaller overshoot of the actuator 31 which does not reach the contact 44. The actuator therefore again cools returning toward the contact 43.
  • the firing of SCR Q1 during each cycle likewise causes a relatively substantial current to be drawn through the heater RH.
  • this heater is effectively re-energized once a flame is established at the burner.
  • the switching device can proceed from its second predetermined state to the next, i.e. an unstable intermediate state that constitutes oscillation between first and second intermediate states.
  • the first intermediate state is produced when engagement takes place between the contact 44 and the contact 45.
  • the connection established by contact 45 shunts the storage capacitor C1 so that the generation of sparking impulses is even more positively inhibited.
  • the bi-metal heater RH continues'to be energized in this state, through the SCR Q1. This continued heating of the bi-metal actuator 31 causes the switching assembly to progress further to the second intermediate state in which the contact 46 is picked up.
  • a given average power level will be applied to the heater RH, by a so-called hunting mode of operation, so as to maintain the actuator in a stable state or situation in which the generation of sparking impulses is inhibited but the solenoid valve is held open. If, during this operation; theflame is somehow extinguished, the bi-metal element will continue to cool even after the contact 46' is released since the complementary SCR, controlled by the flame rectification signal, will not produce energization of the heater RH through the SCR Q1. Accoridngly,.the bi-metal will continue to cool until the contacts 45 and 44 are disengaged to remove the short across the storage capacitor C1.
  • the actuator 31 will be caused by this continuous energization to proceed to an overload or final state in there is a manual resetting of the circuitry, either by replacing the fuse F1 or resetting an equivalent circuit breaker.
  • the actuator 31 will proceed to the initial state shown in FIG. 1 and because of the open circuit, further operation can be instituted only by personal service of the system at the burner.
  • the system shown is failsafe in the sense of preventing, under any conditions, fuel flow in the absence of flame.
  • switching means including output means for providing a plurality of electrical outputs and an electrically energizable actuator means sequentially activatable through predetermined initial, intermediate and final states, with corresponding initial, intermediate and final outputs each operational in one of said states; said actuator comprising a thermally responsive means and a heat source therefor;
  • control circuit means for selectively controlling energization of said actuator in response to the said output made operational thereby;
  • valve actuator means responsive to said electrically energizable actuator means to maintain the valve closed in said initial and final states and open in said intermediate state.
  • said switching means comprises a plurality of contacts for providing said outputs.
  • thermoly responsive means comprises a bi-metal element and said heat source comprises a resistive heater element electrically coupled to said control circuit means.
  • said intermediate state is an unstable state that oscillates between first and second intermediate states that provide, respectively, a first intermediate output that energizes said heat source and a second intermediate output that de-energizes said heat source so as to produce oscillatory movement of said actuator.
  • control circuit means further comprises sensor means for sensing flame at the burner and for selectively controlling energization of said heat source in response to the operational output of said switching means.
  • Apparatus according to claim 5 including ignition means for igniting fuel provided to the burner, and wherein said switching means is further activatable through an ignition state that provides an ignition output that activates said ignition means, said ignition state being encountered by said switching means between said initial and intermediate states.
  • control circuit means comprises ignition control means for deactivating said ignition means with said switching means in said initial, intermediate or final states.
  • valve actuator means comprises an electrical solenoid operatively coupled to said control circuit means.
  • control circuit means further comprises sensor means for sensing flame at the burner and for selectively controlling energization of said actuator in response to the operational output of said switching means.
  • Apparatus for programming the sequence of operation of a burner which is provided with fuel through an electrically operable valve and is provided also with electrical spark-generating and flame-sensing means, said apparatus comprising:
  • switching means including a plurality of contacts and an electrically energizable actuator which, when w energized, proceeds progressively in timed sequence through a succession of predetermined states, with corresponding contacts being operated in each state, the actuator returning back through said states when de-energized;
  • first circuit means responsive to the operation of said contacts in the initial state of said actuator for energizing said actuator the actuator being deenergized thereby when a second predetermined state is entered;
  • said actuator comprises a bi-metal device and a heater thermally coupled to said bi-metal device.
  • said second circuit means comprises a triggerable semiconductor device, a spark coil connected to said ignition electrodes, an energy storage capacitor, and means for triggering said semiconductor device when said capacitor is charged thereby to discharge said capacitor through said coil to produce igniting sparks at said electrodes.
  • said flame responsive circuit comprises a trigger capacitor which is charged by flame conduction at one of said electrodes and a second semiconductor device for repetitively discharging said trigger capacitor to trigger said first semi conductor device.
  • Apparatus for programming the sequence of operation of a burner which is provided with fuel through an electrically operable valve and is provided alsowith electrical spark-generating and flame-sensing means, said apparatus comprising:
  • switching means including a plurality of contacts and an electrically energizable actuator which, when energized, proceedsthrough a succession of prede termined states with corresponding contacts being operated in each state; first circuit'means responsive to the operation of said contacts in the initial state of said actuator for energizing said actuator, the actuator being deenergized thereby when a second state is entered; second circuit means responsive to the operation of said contacts in said second state for opening said valve and for generating spark producing impulses thereby to produce sparking at said burner; circuit means responsive to the sensing of a flame at said burner for inhibiting the generation of spark producing impulses by said second circuit means and for energizing said actuator independently of said first circuit means; and further circuit means responsive to the operation of said contacts in' a subsequent state of said actuator for de-energizing said actuator independently of the operation of said flame responsive circuit whereby said actuator alternates between said subsequent state and a previous state when a flame has been established at said burner.
  • Control apparatus for use with a burner which is provided with fuel through an electrically controllable valve and is provided also with spark ignition and flame sensingelectrodes; said apparatus comprising:
  • switching means including a plurality of contacts, a
  • bi-metal actuator and a heater which, when energized, heats said actuator and causes said actuator discharge said capacitor through said coil to produce igniting sparks at said electrodes, said sparkgenerating circuit being interconnected with said contacts to be energized through said actuator heater when said actuator is in a second of said states, the current drawn by spark generation being insufficient to cause said actuator to proceed;
  • Control apparatus for use with a burner which is provided with fuel through an electrically controllable valve and is provided also with spark ignition and flame-sensing electrodes; said apparatus comprising:
  • switching means including bi-metal actuator carrying an actuator contact, a plurality of other contacts mounted adjacent said actuator contact, and a heater which, when energized, heats said actuator and causes said actuator to proceed from an initial state through a succession of predetermined subsequent states, one of said other contacts being engaged by said actuator contact in said initial state and being disengaged in said subsequent states, the remaining other contacts being successively engaged electrically by said actuator contact in said subsequent states;
  • first circuit means interconnecting said one contact and said heater thereby to energize said heater in said first state
  • spark-generating circuit including a triggerable semiconductor device, a spark coil connected to said ignition electrodes, an energystorage capacitor, and means for triggering said semiconductor device when said capacitor is charged thereby to' discharge said capacitor through said coil to produce igniting sparks at said electrodes, said sparkgenerating circuit being interconnected with a first one of said other contacts to be energized through said actuator heater when said actuator is in a second of said states, the current drawn through said heater by spark generation'being insutficient to cause said actuator to proceed;
  • Apparatus for programming the sequence of operation of a burner which is provided with fuel through a valve comprising:
  • sensor means for sensing the presence of flame at the burner
  • switching means including output means for providing a plurality of electrical outputs and sequentially and reversibly activatable through predetermined initial, intermediate and final states, with corresponding initial, intermediate and final outputs each operational in one of said states;
  • power supply means for supplying power to said actuator means and comprising control circuit means for regulating the level of power supplied thereto, said control circuit adapted to maintain said switching means in said intermediate state by providing said given power level only in response to the presence of flame at said burner as indicated by said sensor means;
  • valve actuator means for maintaining the valve closed with said switching means in said initial and final states and open with said switching means in said intermediate state.
  • said power responsive actuator means comprises a thermally responsive means and a heating means therefor electrically coupled to said control circuit means.
  • said intermediate state comprises first and second intermediate states each of which provide outputs and wherein said control circuit means responds to said first intermediate state by providing a power level above said given level and responds to said second intermediate state by providing a power level below said given level thereby causing said switching means to oscillate between said first and second intermediate states.
  • Apparatus according to claim 22 including ignition means for igniting fuel provided to the burner, and wherein said switching means is further activatable through an ignition state that provides an ignition output that activates said ignition means, said ignition state being encountered by said switching means between said initial and intermediate states.
  • control circuit means comprises ignition control means for deactivating said ignition means with said switching means in said initial, intermediate or final states.
  • valve actuator means comprises an electrical solenoid operatively coupled to said control circuit means.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
US00209685A 1971-12-20 1971-12-20 Burner sequence programmer Expired - Lifetime US3770364A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20968571A 1971-12-20 1971-12-20

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US3770364A true US3770364A (en) 1973-11-06

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Application Number Title Priority Date Filing Date
US00209685A Expired - Lifetime US3770364A (en) 1971-12-20 1971-12-20 Burner sequence programmer

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US (1) US3770364A (enrdf_load_stackoverflow)
JP (1) JPS5810645B2 (enrdf_load_stackoverflow)
CA (1) CA988604A (enrdf_load_stackoverflow)
FR (1) FR2170596A5 (enrdf_load_stackoverflow)
GB (1) GB1406279A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970864A (en) * 1974-03-01 1976-07-20 Johnson Service Company Control arrangement fail-safe timing circuit
US4102628A (en) * 1976-02-23 1978-07-25 Potterton International Limited Control apparatus for gas burning appliance
US20110151387A1 (en) * 2008-05-09 2011-06-23 Kidde-Fenwal, Inc. Ignition control with safeguard function
US20110162591A1 (en) * 2008-02-20 2011-07-07 Jinqiang Fan Assisted commissioning method for combustion control system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4973295A (enrdf_load_stackoverflow) * 1972-11-20 1974-07-15
JPS59122213U (ja) * 1983-02-03 1984-08-17 阿部　直人 熱溶性材料の接着装置
JPS61205905U (enrdf_load_stackoverflow) * 1985-06-12 1986-12-26
JP2648895B2 (ja) * 1992-01-29 1997-09-03 鋼鈑工業株式会社 熱可塑性帯の結束ヘッド
GB9416205D0 (en) * 1994-08-11 1994-10-05 Stoves Ltd Improvements in and relating to cooking apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101897A (en) * 1960-12-29 1963-08-27 Suburban Appliance Company Control for burners
US3472220A (en) * 1967-10-25 1969-10-14 Robertshaw Controls Co Temperature control systems using a time delay relay

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101897A (en) * 1960-12-29 1963-08-27 Suburban Appliance Company Control for burners
US3472220A (en) * 1967-10-25 1969-10-14 Robertshaw Controls Co Temperature control systems using a time delay relay

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970864A (en) * 1974-03-01 1976-07-20 Johnson Service Company Control arrangement fail-safe timing circuit
US4102628A (en) * 1976-02-23 1978-07-25 Potterton International Limited Control apparatus for gas burning appliance
US20110162591A1 (en) * 2008-02-20 2011-07-07 Jinqiang Fan Assisted commissioning method for combustion control system
US8602772B2 (en) 2008-02-20 2013-12-10 Utc Fire & Security Corporation Assisted commissioning method for combustion control system
US20110151387A1 (en) * 2008-05-09 2011-06-23 Kidde-Fenwal, Inc. Ignition control with safeguard function

Also Published As

Publication number Publication date
JPS5810645B2 (ja) 1983-02-26
FR2170596A5 (enrdf_load_stackoverflow) 1973-09-14
CA988604A (en) 1976-05-04
GB1406279A (en) 1975-09-17
JPS4919436A (enrdf_load_stackoverflow) 1974-02-20

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AS Assignment

Owner name: KIDDE, INC.

Free format text: MERGER;ASSIGNORS:HIMP-2 INC.;HIMP-2 INC. (CHANGED TO);REEL/FRAME:005046/0017

Effective date: 19880331

Owner name: FENWAL INCORPORATED, A CORP. OF DE, MASSACHUSETTS

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Owner name: BLOOM-1 INC., A CORP. OF DE

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Effective date: 19880331