Patents by Inventor Douglas A. Doers
Douglas A. Doers 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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Publication number: 20200291844Abstract: A 2-cycle, direct-injection diesel engine configured to accommodate low cetane diesel and jet fuels. The engine includes combustion chambers having surfaces which are operable at high temperatures during engine operation to increase the combustion rate of low cetane fuels. The engine is further configured to reduce starting times in cold and/or low pressure situations such as those experienced during attempts to restart a plane engine at relatively high altitudes.Type: ApplicationFiled: June 3, 2020Publication date: September 17, 2020Inventors: Douglas A. Doers, Robert A. Greco, Paul Olesen, Dennis Raymond Webb
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Patent number: 10711681Abstract: A 2-cycle, direct-injection diesel engine configured to accommodate low cetane diesel and jet fuels. The engine includes combustion chambers having surfaces which are operable at high temperatures during engine operation to increase the combustion rate of low cetane fuels. The engine is further configured to reduce starting times in cold and/or low pressure situations such as those experienced during attempts to restart a plane engine at relatively high altitudes.Type: GrantFiled: September 20, 2019Date of Patent: July 14, 2020Assignee: DeltaHawk Engines, Inc.Inventors: Douglas A. Doers, Robert A. Greco, Paul Olesen, Dennis Raymond Webb
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Publication number: 20200018220Abstract: A 2-cycle, direct-injection diesel engine configured to accommodate low cetane diesel and jet fuels. The engine includes combustion chambers having surfaces which are operable at high temperatures during engine operation to increase the combustion rate of low cetane fuels. The engine is further configured to reduce starting times in cold and/or low pressure situations such as those experienced during attempts to restart a plane engine at relatively high altitudes.Type: ApplicationFiled: September 20, 2019Publication date: January 16, 2020Inventors: Douglas A. Doers, Robert A. Greco, Paul Olesen, Dennis Raymond Webb
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Patent number: 10458307Abstract: A 2-cycle, direct-injection diesel engine configured to accommodate low cetane diesel and jet fuels. The engine includes combustion chambers having surfaces which are operable at high temperatures during engine operation to increase the combustion rate of low cetane fuels. The engine is further configured to reduce starting times in cold and/or low pressure situations such as those experienced during attempts to restart a plane engine at relatively high altitudes.Type: GrantFiled: December 18, 2018Date of Patent: October 29, 2019Assignee: DeltaHawk Engines, Inc.Inventors: Douglas A. Doers, Robert A. Greco, Paul Olesen, Dennis Raymond Webb
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Publication number: 20190120117Abstract: A 2-cycle, direct-injection diesel engine configured to accommodate low cetane diesel and jet fuels. The engine includes combustion chambers having surfaces which are operable at high temperatures during engine operation to increase the combustion rate of low cetane fuels. The engine is further configured to reduce starting times in cold and/or low pressure situations such as those experienced during attempts to restart a plane engine at relatively high altitudes.Type: ApplicationFiled: December 18, 2018Publication date: April 25, 2019Inventors: Douglas A. Doers, Robert A. Greco, Paul Olesen, Dennis Raymond Webb
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Publication number: 20180023489Abstract: A single input engine controller and system are provided for translating a single input indicative of the amount of fuel to be supplied to an engine from a fuel control interface into separate signals for controlling the amount of fuel supplied to the engine and the RPM of a propeller powered by that engine. The single input controller translating the single input into the separate signal for the RPM of the propeller according to a fuel efficiency relationship between the fuel amount and the propeller RPM.Type: ApplicationFiled: July 19, 2017Publication date: January 25, 2018Inventors: Dennis R. Webb, William J. Cranmer, Douglas A. Doers
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Patent number: 8371279Abstract: An internal combustion engine that includes a crankcase having a crankcase pressure defined within the crankcase relative to an ambient pressure. The crankcase pressure varies in response to operation of the internal combustion engine. A crankcase pressure regulator is in fluid communication with the crankcase, and the crankcase pressure regulator includes a first passageway defining a first flow path, a second passageway defining a second flow path in a parallel arrangement to the first passageway. When the crankcase pressure is less than a first predetermined pressure, the first valve moves to the open position to allow a fluid flow into the crankcase through the first passageway. When the crankcase pressure is greater than a second predetermined pressure, the second valve moves from the closed position to the open position to allow a fluid flow from the crankcase through the second passageway.Type: GrantFiled: September 30, 2009Date of Patent: February 12, 2013Assignee: Deltahawk Engines, Inc.Inventor: Douglas A. Doers
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Patent number: 7836815Abstract: A piston for an internal combustion engine, the engine having a connecting rod coupled to a wristpin, the wristpin being connected to the piston for pivotal movement about an axis, the piston comprising: a top portion and a generally cylindrically-shaped wall portion extending from the top portion, the top and wall portions defining a skirt cavity, the top portion having thereon a downwardly extending projection with a downwardly facing bearing surface for the wristpin, the bearing surface extending in the direction of the axis and defining a portion of a cylinder centered on the axis, and the projection having opposite sides facing the skirt cavity; at least one lubricant passage extending through the projection from one of the opposite sides and over the bearing surface to the other of the opposite sides; and a lubricant opening communicating between the lubricant passage and the bearing surface to supply lubricant to the bearing surface and to the wristpin.Type: GrantFiled: March 20, 2007Date of Patent: November 23, 2010Assignee: Deltahawk Engines, Inc.Inventors: Douglas A. Doers, David D. Driscoll
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Publication number: 20100077972Abstract: An internal combustion engine that includes a crankcase having a crankcase pressure defined within the crankcase relative to an ambient pressure. The crankcase pressure varies in response to operation of the internal combustion engine. A crankcase pressure regulator is in fluid communication with the crankcase, and the crankcase pressure regulator includes a first passageway defining a first flow path, a second passageway defining a second flow path in a parallel arrangement to the first passageway. When the crankcase pressure is less than a first predetermined pressure, the first valve moves to the open position to allow a fluid flow into the crankcase through the first passageway. When the crankcase pressure is greater than a second predetermined pressure, the second valve moves from the closed position to the open position to allow a fluid flow from the crankcase through the second passageway.Type: ApplicationFiled: September 30, 2009Publication date: April 1, 2010Applicant: DELTAHAWK ENGINES, INC.Inventor: Douglas A. Doers
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Publication number: 20070227350Abstract: A piston for an internal combustion engine, the engine having a connecting rod coupled to a wristpin, the wristpin being connected to the piston for pivotal movement about an axis, the piston comprising: a top portion and a generally cylindrically-shaped wall portion extending from the top portion, the top and wall portions defining a skirt cavity, the top portion having thereon a downwardly extending projection with a downwardly facing bearing surface for the wristpin, the bearing surface extending in the direction of the axis and defining a portion of a cylinder centered on the axis, and the projection having opposite sides facing the skirt cavity; at least one lubricant passage extending through the projection from one of the opposite sides and over the bearing surface to the other of the opposite sides; and a lubricant opening communicating between the lubricant passage and the bearing surface to supply lubricant to the bearing surface and to the wristpin.Type: ApplicationFiled: March 20, 2007Publication date: October 4, 2007Inventors: Douglas Doers, David Driscoll
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Publication number: 20050235946Abstract: Improved internal combustion engine, particularly, an improved two-stroke, diesel aircraft engine. The invention includes a new wrist pin/connecting rod connection, a new cooling system for fuel injectors, a new cylinder head cooling arrangement, a new cooling jacket cross-feed arrangement, and a new combustion seal arrangement.Type: ApplicationFiled: June 22, 2005Publication date: October 27, 2005Inventors: Douglas Doers, Dean Bergman
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Publication number: 20050211089Abstract: A piston for an internal combustion engine including a skirt (32) and a crown (34). The skirt includes a top portion (48) and a cylindrically-shaped wall portion (50) extending from the top portion defining a skirt cavity (82). The top portion includes upper and lower surfaces. The lower surface is configured to define a bearing surface (72) for the wristpin (98). The crown is coupled to the skirt and includes a lower surface in facing relation to the upper surface. The lower surface of the crown and the upper surface define a lubrication cavity (46). The top portion includes at least one inlet hole (84) adapted to supply a lubricant from the skirt cavity to the lubrication cavity. The top portion includes at least one lubrication hole (90) adapted to supply the lubrication cavity to the bearing surface and the wristpin.Type: ApplicationFiled: May 15, 2003Publication date: September 29, 2005Inventor: Douglas Doers
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Patent number: 6769383Abstract: Improved internal combustion engine, particularly, an improved two-stroke, diesel aircraft engine. The invention includes a new wrist pin/connecting rod connection, a new cooling system for fuel injectors, a new cylinder head cooling arrangement, a new cooling jacket cross-feed arrangement, and a new combustion seal arrangement.Type: GrantFiled: January 24, 2003Date of Patent: August 3, 2004Assignee: DeltaHawk, Inc.Inventors: Douglas A. Doers, Dean P. Bergman
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Patent number: 6622667Abstract: Improved internal combustion engine, particularly, an improved two-stroke, diesel aircraft engine. A first improvement includes a wrist pin/connection rod assembly. A plurality of fasteners extend through a wall of a wrist pin and into a wrist pin insert to secure the wrist pin to a cradle-like portion of a connecting rod. A second improvement includes a fuel injection system which cools fuel injectors with overflow fuel from a fuel pump. The overflow fuel is warmed as it cools the fuel injectors, thereby preventing ice-build up on a fuel filter in cold weather as the overflow fuel is recirculated to the fuel pump. A third improvement includes a new cylinder head cooling arrangement. The cylinder head and a cooling cap define an annular cooling passageway. Cooling fluid flows through the annular cooling passageway to cool the cylinder head. The cooling cap includes an inlet port and an outlet port which are not diametrically opposed.Type: GrantFiled: September 15, 2000Date of Patent: September 23, 2003Assignee: DeltaHawk, Inc.Inventor: Douglas A. Doers
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Publication number: 20030106503Abstract: Improved internal combustion engine, particularly, an improved two-stroke, diesel aircraft engine. The invention includes a new wrist pin/connecting rod connection, a new cooling system for fuel injectors, a new cylinder head cooling arrangement, a new cooling jacket cross-feed arrangement, and a new combustion seal arrangement.Type: ApplicationFiled: January 24, 2003Publication date: June 12, 2003Applicant: DeltaHawk, Inc.Inventors: Douglas A. Doers, Dean P. Bergman
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Patent number: RE40500Abstract: Improved internal combustion engine, particularly, an improved two-stroke, diesel aircraft engine. The invention includes a new wrist pin/connecting rod connection, a new cooling system for fuel injectors, a new cylinder head cooling arrangement, a new cooling jacket cross-feed arrangement, and a new combustion seal arrangement.Type: GrantFiled: August 3, 2006Date of Patent: September 16, 2008Assignee: DeltaHawk Engines, Inc.Inventors: Douglas A. Doers, Dean P. Bergman
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Patent number: RE41335Abstract: Improved internal combustion engine, particularly, an improved two-stroke, diesel aircraft engine. A first improvement includes a wrist pin/connection rod assembly. A plurality of fasteners extend through a wall of a wrist pin and into a wrist pin insert to secure the wrist pin to a cradle-like portion of a connecting rod. A second improvement includes a fuel injection system which cools fuel injectors with overflow fuel from a fuel pump. The overflow fuel is warmed as it cools the fuel injectors, thereby preventing ice-build up on a fuel filter in cold weather as the overflow fuel is recirculated to the fuel pump. A third improvement includes a new cylinder head cooling arrangement. The cylinder head and a cooling cap define an annular cooling passageway. Cooling fluid flows through the annular cooling passageway to cool the cylinder head. The cooling cap includes an inlet port and an outlet port which are not diametrically opposed.Type: GrantFiled: September 23, 2005Date of Patent: May 18, 2010Assignee: DeltaHawk Engines, Inc.Inventor: Douglas A. Doers