Patents by Inventor David A. Spicer

David A. Spicer 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).

  • Publication number: 20190085249
    Abstract: A method and apparatus of reducing thermal shock in one or more radiant tubes of a pyrolysis furnace is provided. The apparatus is a furnace comprising a blower and blower bypass conduit providing separate fluid communication paths for flue gas from the convection section to a natural draft flue gas stack. The method comprises the steps of: redirecting at least a portion of the flue gas through the blower bypass conduit when a blower shut-off event is indicated as well as reducing the firing rate of the furnace.
    Type: Application
    Filed: November 16, 2018
    Publication date: March 21, 2019
    Inventors: David Spicer, Philippe J. Le Roy, George Stephens
  • Patent number: 8075305
    Abstract: A burner for use in furnaces such as in steam cracking.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: December 13, 2011
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: George Stephens, David Spicer
  • Patent number: 7909601
    Abstract: A burner for use in furnaces such as those employed in steam cracking. The burner includes a primary air chamber for supplying a first portion of air, a burner tube having an upstream end and a downstream end, a burner tip having an outer diameter, the burner tip mounted on the downstream end of the burner tube adjacent a first opening in the furnace, so that combustion of the fuel takes place downstream of the burner tip producing a gaseous fuel flame, at least one air port in fluid communication with a secondary air chamber for supplying a second portion of air, the at least one air port radially positioned beyond the outer diameter of the burner tip and at least one non-gaseous fuel gun for supplying atomized non-gaseous fuel, the at least one non-gaseous fuel gun having at least one fuel discharge orifice, the at least one non-gaseous fuel gun positioned within the at least one air port.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: March 22, 2011
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: George Stephens, David Spicer, Kurt Edward Kraus
  • Patent number: 7901204
    Abstract: A dual-fuel burner for use in furnaces such as in steam cracking. The burner includes a primary air chamber, a burner tube having an upstream end and a downstream end, a fuel orifice located adjacent the upstream end of the burner tube for introducing gaseous fuel into the burner tube, a burner tip having an outer diameter mounted on the downstream end of the burner tube adjacent a first opening in the furnace, so that combustion of the gaseous fuel takes place downstream of the burner tip, and at least one non-gaseous fuel gun, the at least one non-gaseous fuel gun having at least one fuel discharge orifice for combusting the non-gaseous fuel downstream of the discharge orifice, wherein the at least one non-gaseous fuel gun is radially positioned beyond the outer diameter of the burner tip so that a flame emanating from the combustion of the non-gaseous fuel is substantially aligned in parallel with a flame emanating from the combustion of the gaseous fuel.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: March 8, 2011
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: George Stephens, David Spicer
  • Publication number: 20070172783
    Abstract: A burner for use in furnaces such as those employed in steam cracking. The burner includes a primary air chamber for supplying a first portion of air, a burner tube having an upstream end and a downstream end, a burner tip having an outer diameter, the burner tip mounted on the downstream end of the burner tube adjacent a first opening in the furnace, so that combustion of the fuel takes place downstream of the burner tip producing a gaseous fuel flame, at least one air port in fluid communication with a secondary air chamber for supplying a second portion of air, the at least one air port radially positioned beyond the outer diameter of the burner tip and at least one non-gaseous fuel gun for supplying atomized non-gaseous fuel, the at least one non-gaseous fuel gun having at least one fuel discharge orifice, the at least one non-gaseous fuel gun positioned within the at least one air port.
    Type: Application
    Filed: January 24, 2006
    Publication date: July 26, 2007
    Inventors: George Stephens, David Spicer, Kurt Kraus
  • Publication number: 20070172785
    Abstract: A burner for use in furnaces such as in steam cracking.
    Type: Application
    Filed: January 24, 2006
    Publication date: July 26, 2007
    Inventors: George Stephens, David Spicer
  • Publication number: 20070172784
    Abstract: A dual-fuel burner for use in furnaces such as in steam cracking. The burner includes a primary air chamber, a burner tube having an upstream end and a downstream end, a fuel orifice located adjacent the upstream end of the burner tube for introducing gaseous fuel into the burner tube, a burner tip having an outer diameter mounted on the downstream end of the burner tube adjacent a first opening in the furnace, so that combustion of the gaseous fuel takes place downstream of the burner tip, and at least one non-gaseous fuel gun, the at least one non-gaseous fuel gun having at least one fuel discharge orifice for combusting the non-gaseous fuel downstream of the discharge orifice, wherein the at least one non-gaseous fuel gun is radially positioned beyond the outer diameter of the burner tip so that a flame emanating from the combustion of the non-gaseous fuel is substantially aligned in parallel with a flame emanating from the combustion of the gaseous fuel.
    Type: Application
    Filed: January 24, 2006
    Publication date: July 26, 2007
    Inventors: George Stephens, David Spicer
  • Publication number: 20070007173
    Abstract: A method is provided for treating the effluent from a hydrocarbon pyrolysis unit processing heavier than naphtha feeds to recover heat and remove tar therefrom. The method comprises passing the gaseous effluent to at least one primary transfer line heat exchanger, thereby cooling the gaseous effluent and generating superheated steam. Thereafter, the gaseous effluent is passed through at least one secondary transfer line heat exchanger having a heat exchange surface with a liquid coating on said surface, thereby further cooling the remainder of the gaseous effluent to a temperature at which tar, formed by the pyrolysis process, condenses. The condensed tar is then removed from the gaseous effluent in at least one knock-out drum. An apparatus for carrying out the method is also provided.
    Type: Application
    Filed: July 8, 2005
    Publication date: January 11, 2007
    Inventors: Robert Strack, David Spicer, George Stephens, James Frye
  • Publication number: 20060249428
    Abstract: A process for feeding or cracking heavy hydrocarbon feedstock containing non-volatile hydrocarbons comprising: heating the heavy hydrocarbon feedstock, mixing the heavy hydrocarbon feedstock with a fluid and/or a primary dilution steam stream to form a mixture, flashing the mixture to form a vapor phase and a liquid phase, and varying the amount of the fluid and/or the primary dilution steam stream mixed with the heavy hydrocarbon feedstock in accordance with at least one selected operating parameter of the process, such as the temperature of the flash stream before entering the flash drum.
    Type: Application
    Filed: July 17, 2006
    Publication date: November 9, 2006
    Inventors: Richard Stell, Arthur Dinicolantonio, James Frye, David Spicer, James McCoy, Robert Strack
  • Publication number: 20060185232
    Abstract: An improved tree stabilization system with a perimeter anchor system of a plurality of individual ground anchor assemblies configured adjacent to the tree or shrub to be supported and a related stabilization method. The tree stabilization system is particularly well suited for use in securing mature trees and stands of trees. As it is adjustable, it may be used for long term stability rather than simply during initial root development. The tree stabilization system includes a retention system that is attached to the perimeter anchor system and runs over the root system and pins the root system to the ground at certain important locations. The ground anchor assemblies are inserted into the ground so that the top end to which the retention system is attached is at or under ground level.
    Type: Application
    Filed: February 22, 2005
    Publication date: August 24, 2006
    Inventor: David Spicer
  • Publication number: 20050209495
    Abstract: A process for cracking heavy hydrocarbon comprising heating the heavy hydrocarbon feedstock, mixing the heavy hydrocarbon feedstock with a fluid and/or a primary dilution steam stream to form a mixture, flashing the mixture to form a vapor phase and a liquid phase, separating and cracking the vapor phase, and cooling the product effluent in a transfer line exchanger, wherein the amount of the fluid and/or the primary dilution steam stream mixed with the heavy hydrocarbon feedstock is varied in accordance with at least one selected operating parameter of the process, such as the temperature of the flash stream before entering the flash/separator vessel.
    Type: Application
    Filed: February 28, 2005
    Publication date: September 22, 2005
    Inventors: James McCoy, David Spicer, Richard Stell
  • Publication number: 20050147934
    Abstract: An improved burner and a method for combusting fuel in burners used in furnaces, such as those used in steam cracking, are disclosed. The burner includes a burner tube having an upstream end, a downstream end and a venturi intermediate said upstream and downstream ends, the venturi including a throat portion having substantially constant internal cross-sectional dimensions such that the ratio of the length to maximum internal cross-sectional dimension of the throat portion is at least 3. A burner tip is mounted on the downstream end of the burner tube adjacent a first opening in the furnace, so that combustion of the fuel gas takes place downstream of said burner tip.
    Type: Application
    Filed: March 3, 2005
    Publication date: July 7, 2005
    Inventors: George Stephens, David Spicer
  • Publication number: 20020010764
    Abstract: Connection definitions are centrally defined and distributed over a network. A connection is defined, including information identifying an associated service definition, an associated origination endpoint and an associated destination endpoint within the network. The connection definition is distributed via the network to the origination endpoint and the destination endpoint. The service defined by the service definition is implemented between the origination endpoint and the destination endpoint, and the origination endpoint and the destination endpoint communicate with each other directly over the network in a secure and reliable way.
    Type: Application
    Filed: June 29, 2001
    Publication date: January 24, 2002
    Inventor: David A. Spicer
  • Patent number: 4763317
    Abstract: A switched integrated wideband and narrowband multiservices digital network (FIGS. 1 and 2) is an ISDM providing universal information services based on wideband and narrowband voice, data, and video communications. It comprises a plurality of service areas (100, 101), each served by a central switching node (110). The central node is connected to a plurality of remote nodes (103) by feeder optical fibers (107) and a control bus extension (106). Network interface equipment (104) at subscribers' (102) premises is connected to remote nodes by distribution optical fibers (105). Each distribution fiber is wavelength-division multiplexed and carries modulated (pulse-analog, pulse-code, or differential pulse-code) wideband digital channels (205) and a multiplexed channel (206) comprising 32 time-division-multiplexed narrowband digital channels (207). One narrowband channel (207D) carries all signaling messages.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: August 9, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Harvey R. Lehman, William P. Lidinsky, Harry E. Mussman, David A. Spicer, David Vlack
  • Patent number: 4720850
    Abstract: In a switched integrated wideband and narrowband multiservices digital network (FIG. 1), the network control complex (612) includes a program-controlled call processing arrangement (800) that comprises a point-to-point call processing portion (8001) for handling point-to-point calls and a proxy vendor call processing portion (8002) for handling calls to broadcast program service vendors. For quick response to "channel change" requests from subscribers, the proxy vendor portion handles all calls within a single process (500). For ease of call control, the point-to-point portion handles each call via two processes (650, 660) one for each of the calling and called portions of each call. A message router (8000) receives messages from subscriber terminal equipment (400) requesting control functions for calls and routes them to the appropriate one of the proxy vendor and point-to-point processes.
    Type: Grant
    Filed: March 14, 1986
    Date of Patent: January 19, 1988
    Assignee: American Telephone and Telegraph Company AT&T Bell Laboratories
    Inventors: Lewis B. Oberlander, David A. Spicer, Ralph V. Straubs
  • Patent number: 4713806
    Abstract: In a multiservices digital network (FIG. 1), comprising separate narrowband switch (607) and wideband switches (505, 606), the network control complex (612) includes a program-controlled call processing arrangement (800) that is program-independent of a resource management arrangement (803) and of the physical network. The call processing arrangement views the network as comprising logical channels and logical call paths interconnecting logical channels. It does not distinguish between narrowband and wideband communications; it responds to subscriber (102) messages requesting subscriber functions for both narrowband and wideband communications by directing the resource management arrangement to establish and dismantle logical call paths and to create and destroy logical and physical connections between the logical channels and the logical call paths.
    Type: Grant
    Filed: March 14, 1986
    Date of Patent: December 15, 1987
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Lewis B. Oberlander, David A. Spicer, Ralph V. Straubs