Douglas Edward Hahn

US Patent:

6579136, Jun 17, 2003

Filed:

Dec 14, 2001

Appl. No.:

09/683333

Inventors:

Douglas Hahn - Virginia Beach VA
Mark Skrzypek - Chesapeake VA
Joseph Zablocki - Brandenton FL
Eric Von Hoene - Norfolk VA
Robert Galway - Virginia Beach VA
Carl Stone, II - Portsmouth VA
Cedric Savineau - Virginia Beach VA

Assignee:

AB Volvo Penta - Göteborg

International Classification:

B63H 2110

US Classification:

440 88

Abstract:

System and method for protecting a cooling system of a liquid-cooled engine using a protective material. This system enables a boat operator to flush the cooling system using salt, brackish or fresh water. In one embodiment, the system includes a reservoir, a dispenser and a connection device. The reservoir is capable of containing a protective material that can include, among others properties, anticorrosive properties. The dispenser controls release of the protective material from the reservoir and can be controlled manually or through a control unit. The system is coupled with the cooling system downstream from raw water intake ports and upstream from a terminal end of the cooling system as the cooling system terminates at the exhaust port. The protective fluid can be dispensed using gravity feed or a pump.

US Patent:

20110232600, Sep 29, 2011

Filed:

Sep 8, 2010

Appl. No.:

12/877312

Inventors:

DOUGLAS EDWARD HAHN - Virginia Beach VA, US

International Classification:

F02B 75/32

US Classification:

1231974

Abstract:

A barrel-type piston-actuated internal combustion engine or pump has a drive shaft with an attached drive cam rotatably disposed within a housing. The drive cam has cam surfaces on at least one side facing a piston and cylinder. A cam follower, attached to a piston rod, is in contact with and follows the cam surfaces of the drive cam, such that rotation of the drive shaft with the drive cam results in linear reciprocating motion of the piston rod and its associated piston, and vice versa. The cam surfaces of the drive cam are cyclical in the circumferential direction in accordance with a non-sinusoidal function that controls the motion of the piston within its cylinder. The cam surfaces, and thus the piston motion, are designed and tailored to achieve desired combustion characteristics, in the case of an internal combustion engine, or pumping characteristics in the case of a pump.

US Patent:

60771372, Jun 20, 2000

Filed:

Jan 8, 1999

Appl. No.:

9/227333

Inventors:

Douglas E. Hahn - Virginia Beach VA

Assignee:

Volvo Penta of the Americas, Inc. - Chesapeake VA

International Classification:

B63H 2138

US Classification:

440 89

Abstract:

An anti ingestion device for use with an engine, preferably a marine engine. The device comprises an exhaust manifold or riser system for exhausting engine gases, wherein the exhaust manifold has a first end and a second end, and the first end is connected to a cylinder head. There is a one-way pressure relief valve having a first end and a second end, wherein the first end is coupled to the exhaust manifold and the second end is exposed to atmospheric pressure. An air inlet line is coupled to the second end of the one-way pressure relief valve, such that the air inlet line serves as a conduit for guiding atmospheric pressure to the one-way pressure relief valve, thereby providing atmospheric pressure for passage into the exhaust manifold.

US Patent:

57878641, Aug 4, 1998

Filed:

Dec 21, 1996

Appl. No.:

8/771647

Inventors:

Robert Kirk Collier - Merritt Island FL
Robert Louis Hoekstra - Oviedo FL
David Neal Mulligan - Titusville FL
Douglas Edward Hahn - Melbourne FL

Assignee:

University of Central Florida - Orlando FL

International Classification:

F02M 6706

US Classification:

123492

Abstract:

A hydrogen and natural gas fuel mixture for internal combustion engines is provided for vehicle engines such as those used in standard production engines for automobiles, trains and lawn mowers. The gaseous fuel for operating a vehicle combustion engines includes approximately 21 to 50% Hydrogen and the rest natural gas constituents such as combinations of Methane, Carbon Dioxide, Nitrogen, Ethane, Propane, Iso-Butane, N-Butane, Iso Pentane, N-Pentane, and Hexanes Plus. A fuel mixture of approximately 28 to 36 percent Hydrogen and a air fuel equivalence ratio of approximately 0. 625 is an extreme lean burn condition that yields hydrocarbon emission levels of less than approximately 104 ppm(0. 84 hm/hp hr. ). Current internal combustion engines that are in mass production can take this alternative fuel without any substantial modifications to their systems.

US Patent:

56606028, Aug 26, 1997

Filed:

Mar 4, 1996

Appl. No.:

8/611400

Inventors:

Robert Kirk Collier - Merritt Island FL
Robert Louis Hoekstra - Oviedo FL
David Neal Mulligan - Titusville FL
Douglas Edward Hahn - Melbourne FL

Assignee:

University of Central Florida - Orlando FL

International Classification:

C01B 300

US Classification:

481273

Abstract:

A fuel mixture is disclosed. In a preferred embodiment, an alternative gaseous fuel for operating a combustion engine includes approximately 21 to 50% Hydrogen and the rest natural gas constituants such as combinations of Methane, Carbon Dioxide, Nitrogen, Ethane, Propane, Iso-Butane, N-Butane, Iso Pentane, N-Pentane, and Hexanes Plus. Current production engines without any substantial modifications can take this alternative fuel. This alternative fuel is lean burning and emits emissions that are below current legal standards.

US Patent:

56669232, Sep 16, 1997

Filed:

Apr 25, 1995

Appl. No.:

8/428626

Inventors:

Robert Kirk Collier - Merritt Island FL
Robert Louis Hoekstra - Oviedo FL
David Neal Mulligan - Oakhill FL
Douglas Edward Hahn - Melbourne FL

Assignee:

University of Central Florida - Orlando FL

International Classification:

F02M 2104

US Classification:

123488

Abstract:

A hydrogen and natural gas fuel mixture for internal combustion engines is provided for vehicle engines such as those used in standard production engines for automobiles, trains and lawn mowers. The gaseous fuel for operating a vehicle combustion engines includes approximately 21 to 50% Hydrogen and the rest natural gas constituents such as combinations of Methane, Carbon Dioxide, Nitrogen, Ethane, Propane, Iso-Butane, N-Butane, Iso Pentane, N-Pentane, and Hexanes Plus. A fuel mixture of approximately 28 to 36 percent Hydrogen and a air fuel equivalence ratio of approximately 0. 625 is an extreme lean burn condition that yields hydrocarbon emission levels of less than approximately 104 ppm (0. 84 hm/hp hr. ). Current internal combustion engines that are in mass production can take this alternative fuel without any substantial modifications to their systems.