US3660831A - Electronic antitheft device using an electronic safety lock - Google Patents

Electronic antitheft device using an electronic safety lock Download PDF

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Publication number
US3660831A
US3660831A US3660831DA US3660831A US 3660831 A US3660831 A US 3660831A US 3660831D A US3660831D A US 3660831DA US 3660831 A US3660831 A US 3660831A
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US
United States
Prior art keywords
key
keyhole
antitheft device
contacts
electronic
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
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English (en)
Inventor
Maurilio Nicola
Ezio Luciano
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Maezelectronics SNC
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Maezelectronics SNC
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Publication of US3660831A publication Critical patent/US3660831A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1003—Alarm systems characterised by arm or disarm features
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00658—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by passive electrical keys
    • G07C9/00706—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by passive electrical keys with conductive components, e.g. pins, wires, metallic strips
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00—Locks
    • Y10T70/70—Operating mechanism
    • Y10T70/7051—Using a powered device [e.g., motor]
    • Y10T70/7062—Electrical type [e.g., solenoid]

Definitions

  • the main feature of the device according to the invention resides in that the device comprises an electronic circuit formed by two interlocking main parts.
  • the first is fixed and is mounted on the motor vehicle or along a moving door or wall whose opening is to be controlled.
  • the other part is removable and forms the key or guide element which is coupled to the first part and capable to activate it thereby allowing the opening and/or the closing of the member or members to be controlled. lt also cuts off or closes the alarm electric circuit connected to said controlled members.
  • the fixed part of the device comprises:
  • an analyzer circuit which in turn is formed by three logical circuits
  • a lock or seat for a key provided with internal electrical contacts and designed to receive a key which carries a portable and removable circuit stage.
  • the invention has a further feature in that when the device is set for operation, it locks the motor vehicle ignition, as well as the doors and hood and also controls an audible and/or visual alarm conveniently located.
  • the alarm is triggered by any unauthorized starting, any attempt to introduce a false key into the lock or unauthorized entry of hood, trunk compartment or other parts controlled by the automatic electrical switches.
  • Another feature of the invention relates to the structure of the removable stage or circuit section, operating as a key, whose dimensions are substantially corresponding to those of a normal key and which is provided with a plurality of small electrical circuits providing a pre-established short circuit combinations, chosen from a very wide range of possibilities, each and only one of said combinations being capable to cooperate with a corresponding electrical lock provided with electrical contact terminals arranged in the fixed circuit section.
  • FIG. 1 is a side view of a preferred embodiment of the removable circuit section, having the shape of a flat or laminate key;
  • FIG. 2 is a view ofa lock keyhole for the key of FIG. 1, partially broken along a diametral plane parallel to the entrance slit for the key;
  • FIG. 3 shows a detail of the key, separated from the same
  • FIG. 4 is the preferred arrangement of the electronic diagram for a device whose operation is controlled by the key of H0. 1 cooperating with the lock keyhole of H6. 2.
  • the key shown in the embodiment of FIG. 1 comprises a support 20, made of an electrically insulating material having a suitable mechanical strength and suitable shaped.
  • Onone of the plane faces of its flat tang 22 are arranged electrical contacts, whose number may be any predetermined number but not less than two, indicated by 32, 33 38 which, by means of small conductor bridges, indicated by dark shaded areas may or may not be short-circuited by an analogous contact 31.
  • the total number of combinations which may be obtained with a key of said type results from different short-circuit arrangements of the contacts, which may easily be formed by starting from a printed circuit.
  • the total sum number is obtained by raising the number 2 to the power n (excluding the contacts 3! and 39) and substracting 2, that is: 2" 2 which is equal to the number of different combinations on the keys. Further, by varying, with respect to the others, the position of the contact indicated by 3!, the combinations obtainable are multiplied by the number of different positions said contact 31 may assume. Thus, the number of different combinations and therefore the number of different keys obtainable is very great.
  • the slit keyhole of the lock is provided with a set of electrical terminals 1, 2, 3 l0 insulated from each other and provided with internal metal lamellar projections la, 20 10a protruding within the cavity 41, and capable to accommodate the tang 22 of key 20.
  • the projections la, 2a form a number of electrical contacts, which by sliding, are able to cooperate with contacts 31, 32 39 carried by tang 22.
  • the tang 22 of key 20 is provided at its fore end with a notch 40, while the bottom of the keyhole 41 is provided with a resilient lamellar member 42 which presents a moderate resistance to the insertion of the key to the full length.
  • the tang 22 may assume two positions:
  • the key 20 is therefore inserted and/or extracted with respect to cavity 41 of the lock without any rotational movement of the key.
  • the key is so called only for its shape but, in reality, it forms a removable section with a unique combiner tion of the device electrical circuit.
  • the slit keyhole 41. designed to receive the tang 20 is not a true lock but has the function to transmit, through its electrical terminals to the analyzer circuit, the combination of contacts on tang 22.
  • the device analyzer circuit has the terminal F electrically grounded and tenninal H connected to the electrical power source, for example, the positive pole of an on board battery whose other pole is also grounded. It further comprises three logical circuits providing outputs of the 0/1 type, which for example are voltage levels of about +0.5 volt +l 2 Volt.
  • the tenninals indicated by: l, 2, 3 10 are electrically connected to the terminals of the keyhole, FIG. 2, respectively indicated by the same reference number.
  • the terminal G is connected to the motor ignition coil.
  • Terminals I are connected to one or more audible warning devices.
  • Terminal L is connected to the pushbutton switches which close the alarm circuit when one of the doors or the motor hood cover or the trunk are being opened.
  • E indicates an additional input terminal of the alarm circuit, which may be connected for example to other protective devices.
  • D12 indicate the diodes used in the circuitry of the devicev Ri, R2, R3 indicate bias resistances.
  • RLl indicates a relay operating the closing or opening of the alarm circuit.
  • RL2 indicates a relay operating the closing or opening of the electrical feeding of the device.
  • the analyzer circuit is formed by three logical circuits, FIG. 4, using three transistors: Trl, Tr2, Tr3 whose outputs correspond to the leads respectively indicated by A, B, C.
  • the first logical circuit employing Trl responds to any short to ground of one or more input terminals 2 8 and changes the value of its output at A, from "0 to "I" (from zero to one).
  • Trl which provides the indication of key presence" signal.
  • the second logical circuit Tr2 is designed to check that all the contacts 6, 7, 8, "none excluded, are being short-circuit to groundv
  • the third logical circuit Tr3 is designed to check that "not any" of the contacts being excluded from the key combination, that is, in this example contacts 2, 3, 4, 5 are short-circuited to ground.
  • This code passes to the analyzer circuit formed by transistors:
  • Tr4 TrS, Tr6, connected as follows:
  • the output of A excites the base of Tr4 which has its collector load, the alarm relay RLl.
  • TrS will not prevent the excitation of RLl and therefore the alarm circuit will be closed.
  • the voltage at collector Tr4 is brought to the base of transistor Tr7 which acts as an inverter for the self-holding of the alarm relay RLl.
  • Tr7 acts as an inverter for the self-holding of the alarm relay RLl.
  • Tr7 brings back to the base of TM a second permanent signal of the 1" type.
  • the alarm relay RLl is always predisposed for the electrical feeding and furthermore, when it is excited it may be released only by the introduction within 41 of the key carrying the correct circuit combination.
  • Output B through the capacitor M and the pair of directional diodes D10, D11, is utilized to change the state of the flip-flop formed by transistors Tr8 and Tr9 which operates the connection and/or the disconnection of the device.
  • the output B provides in any case, a signal the effect of which is opposed to that of the A output signal, and is therefore suitable for the purpose.
  • the device must be connected or disconnected without the excitation of the alarm relay RLI.
  • the flip-flop circuit changes its state only with stepped signals which change from 0 to 1 which allows the connection of the device when the key is fully inserted.
  • the disconnection is effected in a partial insertion position of the key.
  • the device When the key is introduced while the device is already connected, the device is firstly disconnected (the signal at B had previously gone from 0" to l to connect and subsequently changes from l to 0 due to the disconnection of the feeding effected by RL2). Then as the key shorts the contacts 9 and 10, the voltage at B returns from 0' to l and the flipflop changes again its state exciting RL2 and feeding permanently the device.
  • the circuit Tr8, Tr9 forming the flip-flop is suitably calculated so that it presents a condition wherein RL2, which is the relay which actuates the switch 47, is released.
  • Said switch 47 connected in parallel with contacts 9 and 10, when open and RLZ is released it disconnects the electrical feeding to the whole device and prevents its being set even ifonly the electrical contacts 9 and 10 are short-circuited.
  • the key 20, 22 must not and cannot rotate within the slit 4!.
  • the manoeuvres to connect and disconnect the antitheft device are almost identical.
  • the key has been provided with the terminal notch 40.
  • the end 390 of the tang 22 meets with the arcuated spring 42. If the manoeuvre stops at this point, and the key is extracted, the short-circuiting between contacts 9 and 10 is avoided, and the relay RLZ is released and the switch 47 is opened. Under these conditions, the feeding for the whole device is lacking.
  • the relay RLZ closes the switch 47 and when the key is then extracted, the device remains in the pre-alarm state.
  • the key must be completely inserted and then extracted. If the device was already connected, when the end 39a of the key reaches in the first position of physical stop against the spring 42, the device will be disconnected. By surpassing the resilient stop of spring 42 and noting the slight snap of the spring into the notch 41, thereby completely inserting the key, the device is again connected.
  • the device was previously connected, the manoeuver is evident, that is, the key must be partially inserted until it encounters the resilient stop 42 and then removed. If the device was previously disconnected, the same procedure occurs but no changes result. In any doubtful case, it will be sufficient to suppose that the device is in the condition opposed to the desired condition.
  • Signal of the type may be, evidently, driven through directional diodes to the output terminal A.
  • These alarm signals may be generated by suitable trap-pushbuttons or any other suitable device, in order to prevent thereby any possible tampering of the analyzer circuit.
  • FIG. 3 represents a mask 46 which may be applied, by embedding it, longitudinally onto the central part of the tang 22 in order to mask the circuitry section, that is the arrangement of the small bridges between opposed contacts.
  • Said mask 46 is embedded and fits onto the printed circuit provided on the tang 22. Even if the mask is removed, it causes the removal of the circuitry section on which it is applied, thereby preventing whoever might be in temporary possession ofa key, from constructing a duplicate of the key. The only duplicate may be made by the original manufacturer through the identification number of each key.
  • the same key may also be used as a start key for the motor of the motor vehicle. To this end it is sufficient to provide the motor vehicle with a suitable keycontrolled switch wherein the same key controlling the antitheft device may by an additional movement of inserting or angular turning within the keyhole also start the engine.
  • the device of the invention may control the opening and closing of lock latches operating with electric pulses. It is evident that the locks controlled by means of this device, easily contructed, become inviolable and result in an efficient alarm device.
  • Another advantage, deriving from the use of the device according to the invention, resides further in that a single key or removable circuit section, may control electrical locks and alarm systems which are identical and situated in different places. For example, for the same person, on the automobile, on the house door, the office door, the safe and/or writing desk, etc. reducing thereby to only one, the number of keys a person normally needs.
  • the device of the present invention is in no way limited to the example described and illustrated and that, without departing from the scope of the invention, it may be varied and improved according to the practical use requirements. It may be necessary, for example, to substitute the relays with static devices, particularly if the device is used in explosive atmospheres. These devices can operate with transistors or controlled diodes. The circuit may be further simplified by replacing the flip-flop with a stepping relay, even if this substitution would increase the dimensions and the cost of the device.
  • An electronic antitheft device for preventing the unauthorized opening of a closeable member by the activation of an alarm and adapted to be energized from a power supply, said device comprising: a fixed circuit section contained within a lock mounted on said closeable member, and further comprising a keyhole, a plurality of electrical terminals placed along said keyhole, additional electrical terminals arranged on said keyhole and blocking means within said keyhole establishing a first and second positions along said keyhole; a movable circuit section contained on a key-shaped member capable of insertion within said keyhole and further comprising guide means for guiding the inserted key with relation to said blocking means into said first and said second positions, a plurality of electrical contacts arranged along the tongue portion of the key and designed to interconnect predetermined ones of said plurality of terminals when said key is in both said first and second positions, and additional electrical contacts arranged on the said tongue portion and designed to interconnect said additional terminals when said key is in said second position; and electronic circuit means further comprising code checking means which when energized by said
  • said switch means includes a flip-flop circuit triggered by said switch signal and relay switch means controlled by the state of said flip-flop and coupled between the power supply and said code checking means.
  • An electronic antitheft device as in claim 10, and further comprising an independent means wherein said angular motion of the key activates said independent means.
  • An electronic antitheft device as in claim 9 and further comprising an independent means wherein after complete insertion of said key in said keyhole a further longitudinal push upon said key temporarily activates said independent means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Burglar Alarm Systems (AREA)
US3660831D 1969-04-02 1970-04-02 Electronic antitheft device using an electronic safety lock Expired - Lifetime US3660831A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT5126969 1969-04-02

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US3660831A true US3660831A (en) 1972-05-02

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US3660831D Expired - Lifetime US3660831A (en) 1969-04-02 1970-04-02 Electronic antitheft device using an electronic safety lock

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US (1) US3660831A (enrdf_load_stackoverflow)
BE (1) BE748366A (enrdf_load_stackoverflow)
CA (1) CA924789A (enrdf_load_stackoverflow)
CH (1) CH513476A (enrdf_load_stackoverflow)
DE (1) DE2015851A1 (enrdf_load_stackoverflow)
ES (1) ES378709A1 (enrdf_load_stackoverflow)
FR (1) FR2042858A5 (enrdf_load_stackoverflow)
GB (1) GB1312942A (enrdf_load_stackoverflow)
LU (1) LU60637A1 (enrdf_load_stackoverflow)
NL (1) NL7004700A (enrdf_load_stackoverflow)
SE (1) SE376200B (enrdf_load_stackoverflow)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757319A (en) * 1971-04-05 1973-09-04 Eaton Corp Security alarm system with bypass
US3825703A (en) * 1972-02-23 1974-07-23 Emerjy Villeurbanne Switch for multispeed electric motor
US3967166A (en) * 1973-04-25 1976-06-29 Wei Ching Yeu Electronic lock
JPS52133000A (en) * 1976-04-30 1977-11-08 Yoshimura Suguru Electronic lock device
US4209709A (en) * 1978-09-05 1980-06-24 BBJ Laboratories Anti-theft ignition system
US4297569A (en) * 1979-06-28 1981-10-27 Datakey, Inc. Microelectronic memory key with receptacle and systems therefor
US4326125A (en) * 1980-06-26 1982-04-20 Datakey, Inc. Microelectronic memory key with receptacle and systems therefor
USD265049S (en) 1980-05-27 1982-06-22 Datakey, Inc. Electronic information key
US4420794A (en) * 1981-09-10 1983-12-13 Research, Incorporated Integrated circuit switch
USD274126S (en) 1982-09-17 1984-06-05 Datakey, Inc. Electronic information key
US4549076A (en) * 1983-03-24 1985-10-22 Datakey, Inc. Orientation guide arrangement for electronic key and receptacle combination
US4642734A (en) * 1981-09-10 1987-02-10 Research, Incorporated Integrated circuit chip switch
FR2593310A1 (fr) * 1986-01-22 1987-07-24 Stratel Dispositif anti-effraction pour installations de protection d'enceintes fermees comportant un boitier de telecommande accessible de l'exterieur
GB2197379A (en) * 1985-11-16 1988-05-18 Grant Muller Glen Electric security lock
US4752679A (en) * 1987-03-02 1988-06-21 Datakey, Inc. Receptacle device
GB2219827A (en) * 1988-06-15 1989-12-20 Anthony Martin Knight Security device
US4918955A (en) * 1986-10-07 1990-04-24 Kabushiki Kaisha Tokai Rika Denki Seisakusho Vehicle key device
US5003801A (en) * 1987-01-20 1991-04-02 Ford Motor Company Programmable key and improved lock assembly
US5203004A (en) * 1990-01-08 1993-04-13 Tandem Computers Incorporated Multi-board system having electronic keying and preventing power to improperly connected plug-in board with improperly configured diode connections
US5311168A (en) * 1992-09-10 1994-05-10 Pease Industries, Inc. Lock set with self-contained door alarm and annunciator system
US6442986B1 (en) 1998-04-07 2002-09-03 Best Lock Corporation Electronic token and lock core
GB2431195A (en) * 2005-10-12 2007-04-18 Hsin-Wan Chen Key with incorporated electronic circuit
US20070188302A1 (en) * 2002-03-29 2007-08-16 Datakey Electronics, Inc. Electronic Key System and Method
USD557588S1 (en) 2006-08-23 2007-12-18 Datakey Electronics, Inc. Electronic key
USD575628S1 (en) 2006-12-06 2008-08-26 Transoma Medical, Inc. Key for an implantable medical device activator
US20090140837A1 (en) * 2007-07-19 2009-06-04 Glen Eric Jennings RF Token and Receptacle System and Method
US20100264218A1 (en) * 2007-08-29 2010-10-21 Datakey Electronics, Inc Data carrier system and method
US20110272463A1 (en) * 2009-01-30 2011-11-10 Glen Eric Jennings Data carrier system having a compact footprint and methods of manufacturing the same
USD649486S1 (en) 2009-07-09 2011-11-29 ATEK Products , LLC Electronic token and data carrier
USD649896S1 (en) 2009-01-30 2011-12-06 Atek Products, Llc Electronic token and data carrier receptacle
USD649894S1 (en) 2008-12-30 2011-12-06 Atek Products, Llc Electronic token and data carrier
USD649895S1 (en) 2009-01-30 2011-12-06 Atek Products, Llc Electronic token and data carrier
CN115263088A (zh) * 2022-06-22 2022-11-01 杭州海康威视数字技术股份有限公司 电子锁、门禁系统

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CH627513A5 (de) 1978-03-29 1982-01-15 Bauer Kaba Ag Schliesszylinder mit schluessel.
FR2553139B2 (fr) * 1983-01-25 1988-01-08 Angelucci Marc Dispositif de securite pour la fermeture et l'ouverture de portes, fenetres et similaires
EP0125848A3 (en) * 1983-05-09 1986-06-11 Papsi Systems (Proprietary) Limited Electronic activator and sensor assembly
US4521679A (en) * 1983-05-19 1985-06-04 Rockwell International Corporation Data input module
DE8327682U1 (de) * 1983-09-27 1984-02-16 Grundfos A/S, 8850 Bjerringbro Steckerteil für einen Stator mit fest angeordneten Wicklungskontakten
DE3940738A1 (de) * 1989-12-09 1991-06-20 Schreiber Hans Vorrichtung zum ausloesen eines elektrisch betaetigten schlosses
US5085043A (en) * 1990-06-01 1992-02-04 Black & Decker Inc. Electro-mechanical interlock and module system for lawn mower or other electrical device

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US2767278A (en) * 1951-06-29 1956-10-16 Collins Douglas Magnetic lock switch for starter and ignition circuits
US3160792A (en) * 1960-02-24 1964-12-08 Gen Motors Corp Electric lock
US3182144A (en) * 1960-09-09 1965-05-04 Theodore W Shoe Electric lock having spaced apart conductive areas adapted to be electrically connected with spaced conductive areas on an insertable key
US3403380A (en) * 1965-03-01 1968-09-24 Emhart Corp Key card operated switch and system
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Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757319A (en) * 1971-04-05 1973-09-04 Eaton Corp Security alarm system with bypass
US3825703A (en) * 1972-02-23 1974-07-23 Emerjy Villeurbanne Switch for multispeed electric motor
US3967166A (en) * 1973-04-25 1976-06-29 Wei Ching Yeu Electronic lock
JPS52133000A (en) * 1976-04-30 1977-11-08 Yoshimura Suguru Electronic lock device
US4209709A (en) * 1978-09-05 1980-06-24 BBJ Laboratories Anti-theft ignition system
US4297569A (en) * 1979-06-28 1981-10-27 Datakey, Inc. Microelectronic memory key with receptacle and systems therefor
USD265049S (en) 1980-05-27 1982-06-22 Datakey, Inc. Electronic information key
US4326125A (en) * 1980-06-26 1982-04-20 Datakey, Inc. Microelectronic memory key with receptacle and systems therefor
US4642734A (en) * 1981-09-10 1987-02-10 Research, Incorporated Integrated circuit chip switch
US4420794A (en) * 1981-09-10 1983-12-13 Research, Incorporated Integrated circuit switch
USD274126S (en) 1982-09-17 1984-06-05 Datakey, Inc. Electronic information key
US4549076A (en) * 1983-03-24 1985-10-22 Datakey, Inc. Orientation guide arrangement for electronic key and receptacle combination
GB2197379A (en) * 1985-11-16 1988-05-18 Grant Muller Glen Electric security lock
FR2593310A1 (fr) * 1986-01-22 1987-07-24 Stratel Dispositif anti-effraction pour installations de protection d'enceintes fermees comportant un boitier de telecommande accessible de l'exterieur
US4918955A (en) * 1986-10-07 1990-04-24 Kabushiki Kaisha Tokai Rika Denki Seisakusho Vehicle key device
US5003801A (en) * 1987-01-20 1991-04-02 Ford Motor Company Programmable key and improved lock assembly
US4752679A (en) * 1987-03-02 1988-06-21 Datakey, Inc. Receptacle device
GB2219827A (en) * 1988-06-15 1989-12-20 Anthony Martin Knight Security device
GB2219827B (en) * 1988-06-15 1992-10-28 Anthony Martin Knight Security device
US5203004A (en) * 1990-01-08 1993-04-13 Tandem Computers Incorporated Multi-board system having electronic keying and preventing power to improperly connected plug-in board with improperly configured diode connections
US5311168A (en) * 1992-09-10 1994-05-10 Pease Industries, Inc. Lock set with self-contained door alarm and annunciator system
US6442986B1 (en) 1998-04-07 2002-09-03 Best Lock Corporation Electronic token and lock core
US6668606B1 (en) 1998-04-07 2003-12-30 Best Access Systems Electronic token lock core
US6840072B2 (en) 1998-04-07 2005-01-11 Stanley Security Solutions, Inc. Electronic token and lock core
US7316140B2 (en) 1998-04-07 2008-01-08 Stanley Security Solutions, Inc. Electronic token and lock core
US20070188302A1 (en) * 2002-03-29 2007-08-16 Datakey Electronics, Inc. Electronic Key System and Method
GB2431195A (en) * 2005-10-12 2007-04-18 Hsin-Wan Chen Key with incorporated electronic circuit
GB2431195B (en) * 2005-10-12 2007-09-12 Hsin-Wan Chen A key for opening a lock
USD557588S1 (en) 2006-08-23 2007-12-18 Datakey Electronics, Inc. Electronic key
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Also Published As

Publication number Publication date
SE376200B (enrdf_load_stackoverflow) 1975-05-12
NL7004700A (enrdf_load_stackoverflow) 1970-10-06
CA924789A (en) 1973-04-17
GB1312942A (en) 1973-04-11
ES378709A1 (es) 1974-04-01
BE748366A (fr) 1970-09-16
CH513476A (it) 1971-09-30
FR2042858A5 (enrdf_load_stackoverflow) 1971-02-12
LU60637A1 (enrdf_load_stackoverflow) 1970-08-04
DE2015851A1 (de) 1970-11-26

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