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| Number | Title | Issue Date |
| 5716271 | Magnetic latch for exhaust vent A latch for use with a valve on the end of an exhaust vent typically associated with a clothes dryer or the like. The latch includes a flat, plastic bonded magnet having a layer of pressure sensitive adhesive (PSA) for bonding the magnet to one of either ... | 02/10/1998 |
| 4857891 | Random-filament, multi-directionally responsive marker for use in electronic article surveillance systems A magnetic marker for use with electronic article surveillance (EAS) systems in which a two-directional response is obtained. The marker comprises a substantially two-dimensional, sheet-like substrate having multiple metallic filaments randomly dispersed ... | 08/15/1989 |
| 4829288 | Economic, multi-directionally responsive marker for use in electronic article surveillance systems A magnetic marker for use with electronic article surveillance (EAS) systems in which a two-directional very high order harmonic response is obtained. The markers comprise two pairs of elongated strips of low coercive force, high permeability material pos... | 05/09/1989 |
| 4825197 | Dual status magnetic marker having magnetically biasable flux collectors for us in electronic article surveillance systems A dual status marker for use in electronic article surveillance systems having an alternating magnetic field. The marker comprises a magnetic responder element having a central switching portion and flux collectors on each end which concentrate flux withi... | 04/25/1989 |
| 4803421 | Multi input lightning detection system An apparatus for providing a map-like display of weather phenomena such as lightning discharges, in which the distance from an observation location to the source of the discharge is determined from the ratio of the integrated intensity of two different co... | 02/07/1989 |
| 4797753 | Monitor for visually indicating wear on record media A device for dynamically indicating relative wear in a magnetic tape cartridge in which a specially identifiable signal is recorded on a separate track from that used for normal recording. Upon playback, the specially identifiable signal is recovered and ... | 01/10/1989 |
| 4791643 | Single track orthogonal error correction system An error correcting method for use with a continuous serialized stream of digital information, such as present with digitized stereo audio signals, in which data is formatted in frames containing a preselected number of data words, parity words which in c... | 12/13/1988 |
| 4786984 | Method and apparatus for locating the edge of a magnetic tape A method and apparatus for magnetically detecting the edge of a magnetic recording tape to enable accurate positioning of a tranversely movable recording/playback unit at any of a plurality of track locations across the width of the tape. The gain of a pl... | 11/22/1988 |
| 4774521 | Resonant marker for use with radio frequency electronic article surveillance system A resonant marker for use with an RF electronic article surveillance system, said marker having a resonant circuit combining a flat coil with a condenser, adapted to be mounted on an article so as to be located by a goods monitoring apparatus by radio wav... | 09/27/1988 |
| 4769753 | Compensated exponential voltage multiplier for electroluminescent displays An exponential multiplication power supply is described which is comprised of a plurality of stages each having the ability to store energy and each having a plurality of states, including at least a store state and a stack state. The plurality of stages ... | 09/06/1988 |
| 4752758 | Demagnetization apparatus for magnetic markers used with article surveilliance systems A demagnetization apparatus for use with magnetically based electronic article surveillance systems having a dual status anti-theft marker containing at least one demagnetizable control element which when demagnetized allows the marker to be detected by t... | 06/21/1988 |
| 4747529 | Collapsible ski rack A collapsible rack for use with skis or other elongated articles, comprising a pair of units adapted to be mounted spaced apart, such as on the roof of a car, each unit having a hinged assembly which when vertically upright, allows the skis to be position... | 05/31/1988 |
| 4746908 | Dual-status, magnetically imagable article surveillance marker A dual status magnetic marker for use in electronic article surveillance systems, in which a piece of low coercive force, high permeability material is positioned adjacent to a piece of remanently magnetizable material. The first piece is configured such ... | 05/24/1988 |
| 4745401 | RF reactivatable marker for electronic article surveillance system A marker for use in radio frequency electronic article surveillance systems where the marker contains an inductive-capacitive resonant circuit and is made reversibly deactivatable and reactivatable by the addition of a piece of magnetic material and means... | 05/17/1988 |
| 4709813 | Anti-theft device for compact discs An anti-theft device for restricting unauthorized removal of an article such as a CD audio disc from a cartridge having a mounting stud resiliently engaging a central opening in the article when it is positioned in the cartridge. The device includes a loc... | 12/01/1987 |
| 4710754 | Magnetic marker having switching section for use in electronic article surveillance systems A magnetic marker for use with electronic article surveillance systems in which a very high order harmonic response is obtained with postage-stamp sized pieces of high permeability material shaped to have a narrow switching section within which flux is co... | 12/01/1987 |
| 4697407 | Retroreflective fiber and method of making same A thread-like continuous retroreflective fiber and method of making same, comprising the steps of laminating a thin film of retroreflective material to a supporting polyester film, and then slitting the laminate to form narrow strips of retroreflective ma... | 10/06/1987 |
| 4697170 | Method for minimizing false alarms and electronic noise in electronic article surveillance systems. A method for minimizing false alarms and background electronic noise in an electronic article surveillance system operated in the vicinity of substantially closed electrical loops such as formed by metal door and window frames. If the conductance of such ... | 09/29/1987 |
| 4689636 | Deactivatable resonant marker for use in RF electronic article surveillance system A deactivatable marker for use in an RF electronic article surveillance system is disclosed, which marker includes a resonant circuit having at least one inductive component and one capacitive component. The circuit further comprises a component having tw... | 08/25/1987 |
| 4689590 | Demagnetization apparatus for magnetic markers used with electromagnetic article surveillance systems A demagnetization apparatus for use with magnetically based electronic article surveillance systems having a dual status anti-theft marker containing at least one demagnetizable control element which when demagnetized allows the marker to be detected by t... | 08/25/1987 |
| 4677799 | Multi-sectional raceway A multi-sectional raceway is used in combination with a pair of interconnected panels of a detection system. The panels are attached to the ends of a pair of support beams, and electrical wiring runs between the panels. The raceway runs between the panels... | 07/07/1987 |
| 4667185 | Wireless synchronization system for electronic article surveillance system Operation of similar electronic article surveillance (EAS) systems in proximity to each other may result in false alarms or system "shut-downs" as a result of signals transmitted from one system being detected in the receiver circuits of the other systems... | 05/19/1987 |
| 4658264 | Folded RF marker for electronic article surveillance systems A tuned resonant circuit including inductive and capacitive components useful as a marker in electronic article surveillance systems, comprising a laminate of a dielectric sheet having a conductive layer on one side configured to form at least one multi-t... | 04/14/1987 |
| 4635076 | Two-sided optical recording medium The novel optical recording medium, as in the prior art, has a transparent substrate bearing two recording layers, each addressable from only one side of the medium, but unlike prior 2-sided media, the two recording layers are on the same face of the subs... | 01/06/1987 |
| 4609911 | Variable frequency RF electronic surveillance system An electronic article surveillance system is disclosed, having a transmitter means for producing in an interrogation zone sequences containing a plurality of discrete different radio frequencies thereby causing a circuit present within the zone to resonat... | 09/02/1986 |
| 4607303 | Tripod cassette positioning Cassette recorder has a spring member which fits into a depression in the rear edgewall of a cassette to sense whether the cassette is properly positioned for recording. The depression preferably is a conical receptacle, and the spring member has a rounde... | 08/19/1986 |
| 4600895 | Precision phase synchronization of free-running oscillator output signal to reference signal A synchronization circuit for a free-running oscillator, in which a multi-tapped delay line provides delayed outputs incrementally spaced throughout the period and at the same frequency as the oscillator. That delayed signal closest in time to a reference... | 07/15/1986 |
| 4598276 | Distributed capacitance LC resonant circuit An electronic article surveillance system and a marker for use therein, which marker comprises a tuned resonant circuit including inductive and capacitive components formed of a laminate of a dielectric and conductive-multi-turn spirals on opposing surfac... | 07/01/1986 |
| 4591189 | Document having light-transmissive, electrically conductive authenticating interior layer A standardized document such as a credit card has a thin, light-transmissive, electrically conductive interior layer, the impedance, capacitance, or conductance of which can be sensed to indicate the authenticity of the document. When the document is cut ... | 05/27/1986 |
| 4588256 | Optical fiber connector A connector for an optical fiber cable is disclosed wherein strain relief features are provided for minimizing strain applied either to the external jacket of the cable or to the fiber such as during connecting operations is prevented from being coupled t... | 05/13/1986 |
| 4581189 | Method of making a belt for belt-driven recording tape pack In a tape which is driven by an elastic pretensioned belt, discontinuities such as embossings in the surface of the belt promote the release of air from between the belt and the underlying tape, thus minimizing variations in tape tension and tape speed.... | 04/08/1986 |
| 4581524 | Flexible ferromagnetic marker for the detection of objects having markers secured thereto A marker adapted to be used with cloth or fabric articles to enable the detection thereof in an electromagnetic article surveillance system within which the marker generates a detectable signal related to an alternating electromagnetic field applied withi... | 04/08/1986 |
| 4579371 | Document having concealed electrically conductive authenticating layer A standardized document such as a credit card or drivers license contains an electrically conductive authenticating layer which is not visually discernible and has an electrical resistivity of less than 50 megohms per square. The presence of the authentic... | 04/01/1986 |
| 4578654 | Distributed capacitance lc resonant circuit A tuned resonant circuit including inductive and capacitive components useful as a marker in electronic marker surveillance systems, comprising a laminate of a dielectric and conductive-multi-turn spirals on opposing surfaces of the dielectric, wherein th... | 03/25/1986 |
| 4564871 | Automatic record-lockout mechanism Recording tape cassette has pivotable spring means including a record-lockout tab which blocks an opening when the spring means is cocked. When placed on a cassette deck, a fixed tang on the deck releases the cocking, allowing the spring means and its rec... | 01/14/1986 |
| 4556893 | Optical recording medium of high sensitivity Optical recording medium having a laser-recordable light-absorbing layer which is a carbide of iron or chromium has surprisingly high sensitivity. High carrier-to-noise ratios are attained using a laser-diode recording system at power levels below 10 mW.... | 12/03/1985 |
| 4555291 | Method of constructing an LC network A method of constructing an LC network, and the resulting LC network manufactured by cutting and removing a predetermined pattern from a first and a second conductive sheet, leaving on each sheet a generally coil-like configuration of windings with a suff... | 11/26/1985 |
| 4551828 | Quadrilayer optical draw medium Quadrilayer optical DRAW medium which differs from prior trilayer optical DRAW media by having a thin triggering layer adjacent each of the optical spacer and light-absorbing layers. The triggering layer is a material, preferably organic, which when heate... | 11/05/1985 |
| 4541559 | Method of making electrical connections between opposing metal foils having a flexible, insulating layer sandwiched therebetween A method of making electrical connections between metal foils laminated to opposing surfaces of a flexible insulating layer, such as may be configured with spiral patterns in the respective metal foils to form inductive-capacitive circuits useful as detec... | 09/17/1985 |
| 4539572 | Optical recording medium An optical recording medium containing a light-absorbing film of refractory material less than 60 nm thick and selected from carbides of Al, Hf, Nb, Ta, Ti, V, W, and Zr and alloys herebetween, whereupon localized heating of the light-absorbing film enabl... | 09/03/1985 |
