Patents by Inventor John F. McKenna
John F. McKenna has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5059148Abstract: A thin-film electroluminescent (TFEL) display panel and method of fabricating a TFEL display are disclosed. The present invention relates to a TFEL display panel shielded by a pair of glass substrates with a protective material disposed therebetween wherein a metal washer is permanently bonded over the substrate oil fill orifices(s) and interfaces the cover glass. This metal washer is prepared in advance by pretinning with a solder to ease reflow after backfill process is complete. This solder provides the seal medium to close the backfill orifice. One of the advantages of using a soldered hole seal according to the present invention is that oil contamination becomes minimized. The backfill hole sealing is accomplished quickly in dry atmosphere without the presence of adhesives of flammable solvents.Type: GrantFiled: December 21, 1987Date of Patent: October 22, 1991Assignee: GTE Products CorporationInventors: John F. McKenna, Robert E. Brown, Paul E. Gagnon
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Patent number: 4810931Abstract: Perfluorinated inert liquids are used as the protective fill fluid in thin film electroluminescent (TFEL) flat panel displays according to the present invention. These fluids enhance panel aging and life test characteristics. Novel filling methods are also described.Type: GrantFiled: December 21, 1987Date of Patent: March 7, 1989Assignee: GTE Products CorporationInventors: John F. McKenna, Jeff Witzel
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Patent number: 4600845Abstract: A clock generator source, a plurality of which can be used as redundant clock sources in a fault tolerant clock system. The input and output clock signals of said source being formed of a plurality of pulses having a frequency substantially higher than the frequency of the input and output signals, one pulse being omitted in each cycle thereof to form a "dead interval" therein when the input and output signals are in phase. When the output signal is not in phase with the input signal at the start of a cycle the length of the cycle of the output signal is either lengthened or shortened by inserting a second dead interval or omitting the dead interval, respectively, to bring the input and output signals in phase by the end of the cycle.Type: GrantFiled: December 30, 1983Date of Patent: July 15, 1986Assignee: The Charles Stark Draper Laboratory, Inc.Inventor: John F. McKenna, Jr.
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Patent number: 4487732Abstract: An arc limiting refractory resistive element is fabricated from aluminum oxide, carbon black and a sintering aid. The fabricating process includes compacting a mixture of the materials, sintering the compact in an inert atmosphere, then oxidizing the outer region of the sintered compact to form a non-conductive sheath around the electrically conductive material.Type: GrantFiled: July 15, 1983Date of Patent: December 11, 1984Assignee: GTE Laboratories IncorporatedInventors: Frank C. Palilla, Burton W. MacAllister, Jr., John F. McKenna
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Patent number: 4487733Abstract: An arc limiting refractory resistive element is fabricated from aluminum oxide, carbon black and a sintering aid. The fabricating process includes compacting a mixture of the materials, sintering the compact in an inert atmosphere, then oxidizing the outer region of the sintered compact to form a non-conductive sheath around the electrically conductive material.Type: GrantFiled: July 15, 1983Date of Patent: December 11, 1984Assignee: GTE Laboratories IncorporatedInventors: Frank C. Palilla, Burton W. MacAllister, Jr., John F. McKenna
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Patent number: 4418327Abstract: An arc limiting refractory resistive element is fabricated from aluminum oxide, carbon black and a sintering aid. The fabricating process includes compacting a mixture of the materials, sintering the compact in an inert atmosphere, then oxidizing the outer region of the sintered compact to form a non-conductive sheath around the electrically conductive material.Type: GrantFiled: September 17, 1981Date of Patent: November 29, 1983Assignees: GTE Laboratories Incorporated, GTE Prods. Corp.Inventors: Frank C. Palilla, Burton W. MacAllister, Jr., John F. McKenna
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Patent number: 4295075Abstract: An arc discharge lamp comprises a ceramic arc tube having an electrode at each end, each electrode being mounted on a support member. A ceramic adapter is sealed to a ceramic cylinder which is sealed to the end of the arc tube. The support member extends through the cylinder into the adapter where it is connected to an externally extending lead-in wire by means of a spiral refractory-metal connector. The connector is flexible enough to withstand the thermal stresses resulting from the normal high operating temperature of the lamp.Type: GrantFiled: December 14, 1979Date of Patent: October 13, 1981Assignee: GTE Products CorporationInventors: Edward A. Webb, John F. McKenna, Frank B. Makar, Jr.
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Patent number: 4239982Abstract: A fault-tolerant clock system for providng digital timing signals (system clock signals) is provided by a plurality of clock sources. Each clock source receives as inputs the generated clock signals from all the other clock sources and contains receiver circuitry to derive a system clock signal from said clock sources which is the consensus clock signals of the other sources. Each clock source generates and distributes to the other clock sources a clock signal which is phase locked to the derived system clock from its clock receiver. In a system of (2r+2) clock sources (r+2) of them will remain phase locked to each other despite up to r clock source failures. Any clock receiver responsive to any (2r+1) of the clock sources can therefore derive a correct system clock despite up to r clock source failures.Type: GrantFiled: June 14, 1978Date of Patent: December 16, 1980Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: T. Basil Smith, John R. Howatt, John F. McKenna, Jr.
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Patent number: 4202036Abstract: A system for measuring ocean characteristics. The system includes a sensor assembly and an associated means to control the system buoyancy to achieve cyclic ascent and descent at controlled speeds, either along a mooring line or free-drifting. Buoyancy control is provided by a pump assembly including two rolling diaphragm-sealed, low friction displacement pistons driven by a high torque d.c. motor operated at low speed. There are four functional groups of data gathering instrumentation. The first group measures horizontal water transport, and includes sensors for current (flow velocity), system azimuth, system tilt, and vertical velocity. The second group provides a determination of salinity, and includes sensors for conductivity, temperature and pressure. The third group monitors conditions within the system, and includes sensors for internal temperature and humidity.Type: GrantFiled: August 16, 1978Date of Patent: May 6, 1980Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: Philip N. Bowditch, John M. Dahlen, John F. McKenna, Jr., John T. Shillingford, Jr., Frank J. Siraco, William E. Toth
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Patent number: 4202034Abstract: A system for measuring ocean characteristics. The system includes a sensor assembly and an associated means to control the system buoyancy to achieve cyclic ascent and descent at controlled speeds, either along a mooring line or free-drifting. Buoyancy control is provided by a pump assembly including two rolling diaphragm-sealed, low friction displacement pistons driven by a high torque d.c. motor operated at low speed. There are four functional groups of data gathering instrumentation. The first group measures horizontal water transport, and includes sensors for current (flow velocity), system azimuth, system tilt, and vertical velocity. The second group provides a determination of salinity, and includes sensors for conductivity, temperature and pressure. The third group monitors conditions within the system, and includes sensors for internal temperature and humidity.Type: GrantFiled: August 16, 1978Date of Patent: May 6, 1980Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: Philip N. Bowditch, John M. Dahlen, John F. McKenna, Jr., John T. Shillingford, Jr., Frank J. Siraco, William E. Toth
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Patent number: 4191049Abstract: A system for measurement of ocean current near the surface wave field. The system includes a controlled buoyancy platform having a current sensor. Upper and lower plural roller assemblies are affixed to the platform for limiting platform motion along a guide line. In one form, each guide assembly includes a plurality of rollers adapted to freely track the guide line so that the platform is both substantially free to move along the guide line in response to pressure gradients from the surface wave field and also substantially decoupled from twisting and axial motions of the guide line.Type: GrantFiled: August 16, 1978Date of Patent: March 4, 1980Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: Philip N. Bowditch, John M. Dahlen, John F. McKenna, Jr., John T. Shillingford, Jr., Frank J. Siraco, William E. Toth
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Patent number: 3935592Abstract: A recording instrument for use in ocean depths and like remote locations and adapted to provide meaningful readings of temperatures and pressure, for example, at such locations over a long period of time without attendance. Analog signals from transducers, which indicate the level of the thing-to-be-measured, are processed to give an averaged digital signal that is then stored on a magnetic tape. The system is battery powered. The instrument detailed is for use at ocean depths where the instrument housing and attachment to a mooring line are of particular importance.Type: GrantFiled: February 22, 1974Date of Patent: January 27, 1976Assignee: Massachusetts Institute of TechnologyInventors: John M. Dahlen, William E. Toth, John T. Shillingford, Jr., John F. McKenna, Jr.
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Patent number: D360512Type: GrantFiled: August 19, 1994Date of Patent: July 18, 1995Assignee: Capital Paper Recycling, Inc.Inventor: John F. McKenna