Patents Represented by Attorney Bernard J. Lyons
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Patent number: 4952173Abstract: A circuit protection device that can be incorporated into a coaxial cable connector for protecting the circuit from a voltage transient, comprises an annulus 11 that has a central aperture for receiving a central conductor, e.g. pin, of the connector. The annulus is electrically insulating and has a central electrode (12) for connection to the connector pin and a peripheral electrode (14) for connection to the connector housing and the coaxial cable screen. A portion of the electrodes overlie each other and are separated from each other by a layer of semiconductor switching material (16). For example, a chalcogenide glass switching material (16) may be evaporated onto a small projecting area (15) of the central electrode, followed by a small circular area (17) of copper, and the deposited copper area (17) may be wire bonded to the rest of the peripheral electrode (14) by wire bridge (18).Type: GrantFiled: October 2, 1989Date of Patent: August 28, 1990Assignee: Raychem PontoiseInventors: Guillaume M. G. Peronnet, Jean-Christian C. Delamotte
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Patent number: 4942270Abstract: This invention provides cable sealing apparatus comprising styrene-ethylene-butylene-styrene triblock copolymer-oil compositions which are temperature resistant and nonmeltable. They have a viscosity at 200.degree. C. of at least 200 poise. The compositions can be molded under pressure at elevated temperatures.Type: GrantFiled: July 12, 1988Date of Patent: July 17, 1990Assignee: Raychem CorporationInventor: Jose P. Gamarra
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Patent number: 4928199Abstract: A circuit protection device for protecting electrical circuits against voltage transients comprises a chip package which includes a threshold switch device formed from an amorphous composition.Type: GrantFiled: September 11, 1989Date of Patent: May 22, 1990Assignee: Raychem LimitedInventors: Stephen H. Diaz, Gabe Cherian, Stephen Morris, John R. Vinson, David Crofts, Anthony J. Moore
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Patent number: 4924340Abstract: A circuit protection device for protecting an electrical circuit from a voltage transient, e.g. a voltage transient caused by an electrostatic discharge, lightning or a nuclear electromagnetic pulse, comprises a threshold switching element formed from an amorphous composition comprising arsenic, sulphur, and optionally germanium, and a pair of electrodes in contact with the composition. The devices generally exhibit a good balance of physical properties including switching speed, energy required to latch them in their low resistance state, high resistance state (off) resistance, threshold voltage and capacitance, which enables them to be used successfully to protect electrical circuits from such transients.Type: GrantFiled: August 31, 1988Date of Patent: May 8, 1990Assignee: Raychem LimitedInventor: Martin Sweet
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Patent number: 4900877Abstract: This invention provides E.M.I. gaskets for electrically shielding and environmentally sealing the space between two surfaces which comprises a metallic electrically conductive deformable structure adapted for forming electrical contact with said surfaces and/or providing electrical shielding in the space between said surfaces; and a gel material for sealing the space between said surfaces having a cone penetration value of about 100 to about 350 (10.sup.-1 mm) and an ultimate elongation of at least 200% and being present in sufficient amount and positioned to provide environmental seal between said surfaces and to provide environmental protection for said metallic structure. The gel may encapsulate the entire metallic structure so that portions of the metallic structure pierces through the gel when the gasket is installed to make electrical contact.Type: GrantFiled: July 12, 1988Date of Patent: February 13, 1990Assignee: Raychem CorporationInventors: Robert S. Dubrow, Christine J. Holland, Randolph W. Chan, Albert R. Martin, Dennis C. Siden, Paul B. Germeraad
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Patent number: 4890182Abstract: A circuit protection device for protecting an electrical circuit from a voltage transient, e.g. a voltage transient caused by an electrostatic discharge, lightning or a nuclear electromagnetic pulse, comprises a threshold switching element formed from an amorphous composition comprising germanium, selenium and optionally antimony, and a pair of electrodes in contact with the composition. The devices generally exhibit a good balance of physical properties including switching speed, energy required to latch them in their low resistance state, high resistance state (off) resistance, threshold voltage and capacitance, which enables them to be used successfully to protect electrical circuits from such transients.Type: GrantFiled: August 31, 1988Date of Patent: December 26, 1989Assignee: Raychem LimitedInventor: Martin Sweet
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Patent number: 4888070Abstract: Environmental sealing may be achieved by means of a flexible envelope having therein a sealing material having a cone penetration value preferably from 100-350 (10.sup.-1 mm) and an ultimate elongation of at least 100%. The material is preferably mechanically deformed preferably by shear and preferably causing it to be comminuted.Type: GrantFiled: December 1, 1987Date of Patent: December 19, 1989Assignee: Raychem CorporationInventors: Brian Clark, William D. Uken, Paul Schoenstein, Geary Camin
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Patent number: 4887182Abstract: A circuit protection device for protecting an electrical circuit from a voltage transient, e.g. a voltage transient caused by an electrostatic discharge, lightning or a nuclear electromagnetic pulse, comprises a threshold switching element formed from an amorphous composition comprising germanium, selenium and optionally antimony, and a pair of electrodes in contact with the composition. The devices generally exhibit a good balance of physical properties including switching speed, energy required to latch them in their low resistance state, high resistance state (off) resistance, threshold voltage and capacitance, which enables them to be used successfully to protect electrical circuits from such transients.Type: GrantFiled: May 2, 1989Date of Patent: December 12, 1989Assignee: Raychem LimitedInventor: Martin Sweet
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Patent number: 4883431Abstract: A gel-filled cap member having a retaining nut member therein for receiving a threaded contact member and a notch, at the open end of the cap member, for at least partially receiving a wire to be connected to the threaded contact member. The cap member may also have a portion at the open end of the cap member which is defined by reinforced wall having an increased cross-sectional area. Further, the cap member may have a plunger portion at the closed end of the cap member for applying increased pressure to the gel.Type: GrantFiled: September 26, 1986Date of Patent: November 28, 1989Assignee: Raychem CorporationInventors: David Uken, R. Grant Truesdale, Jr., Daniel L. Swan
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Patent number: 4875870Abstract: An article for protecting a multiconductor connector comprising a container containing a layer of gel. In one embodiment the container can be moved relative to the container to compress the gel to seal the connector. In another embodiment the gel layer contains a plurality of holes which tend to close when the gel is compressed.Type: GrantFiled: July 18, 1988Date of Patent: October 24, 1989Assignee: Raychem LimitedInventors: Judy Hardy, Kenneth Wallington
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Patent number: 4852646Abstract: This invention provides new heat transfer materials comprising gels and particulate fillers and having a composite heat transfer coefficient greater than 2 watts/m-.degree. K. and preferably greater than 15. The materials are easily conformable to irregularly shaped surfaces and have low TO-3 thermal impedance values, e.g., less than 0.5 at 300 psi mounting pressure.Type: GrantFiled: June 16, 1987Date of Patent: August 1, 1989Assignee: Raychem CorporationInventors: Catherine A. Dittmer, Robert S. Dubrow
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Patent number: 4807081Abstract: An arrangement for protecting an electrical circuit from a voltage transient having a fast rise time, e.g. in the order of 20 Vns.sup.-1 comprises a number of semiconductive threshold foldback switching elements preferably formed from a chalcogenide glass, in parallel with one another between the current carrying line of the circuit and earth. An additional, non-linear, circuit protection device is connected in parallel with the switching element between the current carrying line and earth, in order to pass high frequency components of the transient to earth.Type: GrantFiled: September 3, 1987Date of Patent: February 21, 1989Assignee: Raychem LimitedInventors: David Crofts, Martin A. Wright
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Patent number: 4799125Abstract: An arrangement for protecting an electrical circuit from a voltage transient having a fast rise time, e.g. in the order of 20 Vns.sup.-1 comprises a number of semiconductive threshold foldback switching elements, preferably formed from a chalcogenide glass, in parallel with one another between a current carrying line of the circuit and earth. One or more capacitors are connected in series with the switching elements between the current carrying line and earth in order to prevent any direct currents in the current carrying line holding the switching elements in their low resistance state.Type: GrantFiled: September 3, 1987Date of Patent: January 17, 1989Assignee: Raychem LimitedInventors: David Crofts, Martin A. Wright