Patents by Inventor Luigi P. Tozzi

Luigi P. Tozzi 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: 20240018931
    Abstract: In certain embodiments, remarkable improvements in H2-ICE performance may be achieved with the combination of Active Scavenge Prechamber technology and Predictive Model-Based Spark Control to overcome the drawbacks of known combustion technologies. In certain embodiments, advanced combustion modeling and simulations of the ignition process including the spark event, the arc-travel and stretching, and resulting flame propagation may be used to predict the relationship between the spark energy/power, the flow within the electrode gap, and the flame development (SOC) for different engines, different spark plugs and at various conditions. This information may be used to adjust the spark energy/power characteristic during the same cycle spark event, to minimize the SOC variations and to significantly reduce the propensity to combustion anomalies, such as backfire, knock and preignition, that prevent achieving high engine power densities and efficiencies.
    Type: Application
    Filed: July 9, 2023
    Publication date: January 18, 2024
    Inventors: Luigi P. Tozzi, Maria-Emmanuella Sotiropoulou
  • Patent number: 11771557
    Abstract: Devices and methods are disclosed for treating mitral valve regurgitation that include members that assist the valve in closing during the cardiac cycle. Such devices may include members configured to alter the shape of mitral valve annulus. In certain embodiments, one or more wires may be anchored on one extremity to an element positioned along the posterior part of the mitral annulus, in the coronary sinus, and on another extremity to an element along the anterior part of the mitral annulus, fibrous trigon. The reshaping of the mitral annulus may be accomplished by pulling the wire or wires. Reducing the length of the wire or wires may provide the displacement of the posterior leaflets towards the anterior, thereby increasing the coaptation surface for the valve leaflets and reducing the regurgitation.
    Type: Grant
    Filed: March 30, 2021
    Date of Patent: October 3, 2023
    Assignee: MITRALSHAPE SRL
    Inventor: Luigi P. Tozzi
  • Patent number: 11542860
    Abstract: In certain embodiments, Lube Oil Controlled Ignition (LOCI) Engine Combustion overcomes the drawbacks of known combustion technologies. First, lubricating oil is already part of any combustion engine; hence, there is no need to carry a secondary fuel and to have to depend on an additional fuel system as in the case of dual-fuel technologies. Second, the ignition and the start of combustion rely on the controlled autoignition of the lubricating oil preventing the occurrence of abnormal combustion as experienced with the Spark Ignition technology. Third, LOCI combustion is characterized by the traveling of a premixed flame; hence, it has a controllable duration resulting in a wide engine load-speed window unlike the Homogeneous Charge Compression Ignition technology where the engine load-speed window is narrow. Adaptive Intake Valve Closure may be used to control in-cylinder compression temperature to be high enough to realize the consistent auto ignition of the lubricating oil mist.
    Type: Grant
    Filed: April 9, 2022
    Date of Patent: January 3, 2023
    Assignee: Prometheus Applied Technologies
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Publication number: 20220228527
    Abstract: In certain embodiments, Lube Oil Controlled Ignition (LOCI) Engine Combustion overcomes the drawbacks of known combustion technologies. First, lubricating oil is already part of any combustion engine; hence, there is no need to carry a secondary fuel and to have to depend on an additional fuel system as in the case of dual-fuel technologies. Second, the ignition and the start of combustion rely on the controlled autoignition of the lubricating oil preventing the occurrence of abnormal combustion as experienced with the Spark Ignition technology. Third, LOCI combustion is characterized by the traveling of a premixed flame; hence, it has a controllable duration resulting in a wide engine load-speed window unlike the Homogeneous Charge Compression Ignition technology where the engine load-speed window is narrow. Adaptive Intake Valve Closure may be used to control in-cylinder compression temperature to be high enough to realize the consistent auto ignition of the lubricating oil mist.
    Type: Application
    Filed: April 9, 2022
    Publication date: July 21, 2022
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Patent number: 11319871
    Abstract: In certain embodiments, Lube Oil Controlled Ignition (LOCI) Engine Combustion overcomes the drawbacks of known combustion technologies. First, lubricating oil is already part of any combustion engine; hence, there is no need to carry a secondary fuel and to have to depend on an additional fuel system as in the case of dual-fuel technologies. Second, the ignition and the start of combustion rely on the controlled autoignition of the lubricating oil preventing the occurrence of abnormal combustion as experienced with the Spark Ignition technology. Third, LOCI combustion is characterized by the traveling of a premixed flame; hence, it has a controllable duration resulting in a wide engine load-speed window unlike the Homogeneous Charge Compression Ignition technology where the engine load-speed window is narrow. Adaptive Intake Valve Closure may be used to control in-cylinder compression temperature to be high enough to realize the consistent auto ignition of the lubricating oil mist.
    Type: Grant
    Filed: August 2, 2021
    Date of Patent: May 3, 2022
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Publication number: 20210355865
    Abstract: In certain embodiments, Lube Oil Controlled Ignition (LOCI) Engine Combustion overcomes the drawbacks of known combustion technologies. First, lubricating oil is already part of any combustion engine; hence, there is no need to carry a secondary fuel and to have to depend on an additional fuel system as in the case of dual-fuel technologies. Second, the ignition and the start of combustion rely on the controlled autoignition of the lubricating oil preventing the occurrence of abnormal combustion as experienced with the Spark Ignition technology. Third, LOCI combustion is characterized by the traveling of a premixed flame; hence, it has a controllable duration resulting in a wide engine load-speed window unlike the Homogeneous Charge Compression Ignition technology where the engine load-speed window is narrow. Adaptive Intake Valve Closure may be used to control in-cylinder compression temperature to be high enough to realize the consistent auto ignition of the lubricating oil mist.
    Type: Application
    Filed: August 2, 2021
    Publication date: November 18, 2021
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Publication number: 20210275295
    Abstract: Devices and methods are disclosed for treating mitral valve regurgitation that include members that assist the valve in closing during the cardiac cycle. Such devices may include members configured to alter the shape of mitral valve annulus. In certain embodiments, one or more wires may be anchored on one extremity to an element positioned along the posterior part of the mitral annulus, in the coronary sinus, and on another extremity to an element along the anterior part of the mitral annulus, fibrous trigon. The reshaping of the mitral annulus may be accomplished by pulling the wire or wires. Reducing the length of the wire or wires may provide the displacement of the posterior leaflets towards the anterior, thereby increasing the coaptation surface for the valve leaflets and reducing the regurgitation.
    Type: Application
    Filed: March 30, 2021
    Publication date: September 9, 2021
    Inventor: Luigi P. Tozzi
  • Patent number: 11111846
    Abstract: In certain embodiments, Lube Oil Controlled Ignition (LOCI) Engine Combustion overcomes the drawbacks of known combustion technologies. First, lubricating oil is already part of any combustion engine; hence, there is no need to carry a secondary fuel and to have to depend on an additional fuel system as in the case of dual-fuel technologies. Second, the ignition and the start of combustion rely on the controlled autoignition of the lubricating oil preventing the occurrence of abnormal combustion as experienced with the Spark Ignition technology. Third, LOCI combustion is characterized by the traveling of a premixed flame; hence, it has a controllable duration resulting in a wide engine load-speed window unlike the Homogeneous Charge Compression Ignition technology where the engine load-speed window is narrow. Adaptive Intake Valve Closure may be used to control in-cylinder compression temperature to be high enough to realize the consistent auto ignition of the lubricating oil mist.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: September 7, 2021
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Patent number: 10550820
    Abstract: In certain embodiments, a time-varying spark current ignition system can be applied to improve spark plug ignitability performance and durability as compared to conventional spark ignition systems. Two performance parameters of interest are spark plug life (durability) and spark plug ignitability. In certain embodiments, spark plug life can be extended by applying a spark current amplitude as low as possible without causing quenching of the flame kernel while it is traveling within an electrode gap and/or by applying spark current of a long enough duration to allow the spark/flame kernel to clear a spark plug gap. In certain embodiments, ignitability can be improved by applying a high enough spark current amplitude to sustain the flame kernel once outside the spark plug gap and/or by applying a spark current for long enough to sustain the flame kernel once outside the spark plug gap.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: February 4, 2020
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Luigi P. Tozzi, David Thomas Lepley, Maria Emmanuella Sotiropoulou, Joseph Martin Lepley, Steven B. Pirko
  • Publication number: 20190388216
    Abstract: Devices and methods are disclosed for treating mitral valve regurgitation that include members that assist the valve in closing during the cardiac cycle. Such devices may include members configured to alter the shape of mitral valve annulus. In certain embodiments, one or more wires may be anchored on one extremity to an element positioned along the posterior part of the mitral annulus, in the coronary sinus, and on another extremity to an element along the anterior part of the mitral annulus, fibrous trigon. The reshaping of the mitral annulus may be accomplished by pulling the wire or wires. Reducing the length of the wire or wires may provide the displacement of the posterior leaflets towards the anterior, thereby increasing the coaptation surface for the valve leaflets and reducing the regurgitation.
    Type: Application
    Filed: September 6, 2019
    Publication date: December 26, 2019
    Inventor: Luigi P. Tozzi
  • Publication number: 20190388217
    Abstract: Devices and methods are disclosed for treating mitral valve regurgitation that include members that assist the valve in closing during the cardiac cycle. Such devices may include members configured to alter the shape of mitral valve annulus. In certain embodiments, one or more wires may be anchored on one extremity to an element positioned along the posterior part of the mitral annulus, in the coronary sinus, and on another extremity to an element along the anterior part of the mitral annulus, fibrous trigon. The reshaping of the mitral annulus may be accomplished by pulling the wire or wires. Reducing the length of the wire or wires may provide the displacement of the posterior leaflets towards the anterior, thereby increasing the coaptation surface for the valve leaflets and reducing the regurgitation.
    Type: Application
    Filed: September 6, 2019
    Publication date: December 26, 2019
    Inventor: Luigi P. Tozzi
  • Patent number: 10426620
    Abstract: Devices and methods are disclosed for treating mitral valve regurgitation that include members that assist the valve in closing during the cardiac cycle. Such devices may include members configured to alter the shape of mitral valve annulus. In certain embodiments, one or more wires may be anchored on one extremity to an element positioned along the posterior part of the mitral annulus, in the coronary sinus, and on another extremity to an element along the anterior part of the mitral annulus, fibrous trigon. The reshaping of the mitral annulus may be accomplished by pulling the wire or wires. Reducing the length of the wire or wires may provide the displacement of the posterior leaflets towards the anterior, thereby increasing the coaptation surface for the valve leaflets and reducing the regurgitation.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: October 1, 2019
    Assignee: MITRAL TECHNOLOGIES S.A.
    Inventor: Luigi P. Tozzi
  • Patent number: 10208651
    Abstract: In certain embodiments, a unique method and pre-combustion chamber (PCC) structure may ensure very efficient flame propagation of lean fuel-air mixture in natural gas engines by reducing the amount of fuel admitted to the PCC. A PCC may include an enclosed volume of 1-3% of the main combustion chamber volume, with a spark plug and a fuel passage located opposite one or more PCC discharge nozzles to create a relatively richer fuel-air mixture with relatively lower turbulence in the spark plug region and a relatively leaner fuel-air mixture with relatively high turbulence in the nozzle region, which can be reliably and efficiently ignited, resulting in a high velocity flame jet/torch emerging from the prechamber into the main chamber. The PCC may be threaded with a 22 mm×1.5 or ??-18 thread size, to allow the PCC to be screwed into a cylinder head in place of a spark plug.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: February 19, 2019
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Luigi P. Tozzi, Maria-Emmanuella Sotiropoulou, Greg Beshouri, David Thomas Lepley
  • Publication number: 20190024578
    Abstract: In certain embodiments, Lube Oil Controlled Ignition (LOCI) Engine Combustion overcomes the drawbacks of known combustion technologies. First, lubricating oil is already part of any combustion engine; hence, there is no need to carry a secondary fuel and to have to depend on an additional fuel system as in the case of dual-fuel technologies. Second, the ignition and the start of combustion rely on the controlled autoignition of the lubricating oil preventing the occurrence of abnormal combustion as experienced with the Spark Ignition technology. Third, LOCI combustion is characterized by the traveling of a premixed flame; hence, it has a controllable duration resulting in a wide engine load-speed window unlike the Homogeneous Charge Compression Ignition technology where the engine load-speed window is narrow. Adaptive Intake Valve Closure may be used to control in-cylinder compression temperature to be high enough to realize the consistent auto ignition of the lubricating oil mist.
    Type: Application
    Filed: July 18, 2018
    Publication date: January 24, 2019
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Patent number: 10138799
    Abstract: In certain embodiments, a two-stage precombustion chamber may be used to reduce engine NOx levels, with fueled precombustion chambers, while maintaining comparable engine power output and thermal efficiency. One or more fuel admission points may be located in either the first prechamber stage or the second prechamber stage. A more efficient overall combustion characterized by low levels of NOx formation may be achieved by a two-stage precombustion chamber system while generating very high energy flame jets emerging from the second prechamber stage into the main combustion chamber. A first prechamber stage may be substantially smaller than a second prechamber stage.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: November 27, 2018
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Luigi P. Tozzi, Maria Emmanuella Sotiropoulou, David Thomas Lepley
  • Patent number: 10125665
    Abstract: In certain embodiments with large size prechambers and/or with prechambers that have large spark-gap electrode assemblies, a poor scavenge of the crevice volume may cause deterioration of the preignition margin, which then may limit the power rating of the engine, may cause the flow velocity field of the fuel-air mixture to be excessively uneven and may result in the deterioration of the misfire limit. One or more auxiliary scavenging ports may allow admission of fuel rich mixture to the crevice volume, thereby cooling the residual gases and preventing occurrence of preignition. More organized and powerful flow velocity fields may be obtained in the spark-gap electrode assembly region. This condition may result in a significant extension of the flammability limit and may significantly improve the combustion efficiency of the prechamber. Passive prechambers using the active scavenge concept may increase the engine power output and reduce the emission of pollutants from engine combustion.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: November 13, 2018
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Maria Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Patent number: 10024220
    Abstract: In certain embodiments with large size prechambers and/or with prechambers that have large spark-gap electrode assemblies, a poor scavenge of the crevice volume may cause deterioration of the preignition margin, which then may limit the power rating of the engine, may cause the flow velocity field of the fuel-air mixture to be excessively uneven and may result in the deterioration of the misfire limit. One or more auxiliary scavenging ports may allow admission of fuel rich mixture to the crevice volume, thereby cooling the residual gases and preventing occurrence of preignition. More organized and powerful flow velocity fields may be obtained in the spark-gap electrode assembly region. This condition may result in a significant extension of the flammability limit and may significantly improve the combustion efficiency of the prechamber. Passive prechambers using the active scavenge concept may increase the engine power output and reduce the emission of pollutants from engine combustion.
    Type: Grant
    Filed: November 1, 2015
    Date of Patent: July 17, 2018
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Maria Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Publication number: 20180038270
    Abstract: In certain embodiments, a two-stage precombustion chamber may be used to reduce engine NOx levels, with fueled precombustion chambers, while maintaining comparable engine power output and thermal efficiency. One or more fuel admission points may be located in either the first prechamber stage or the second prechamber stage. A more efficient overall combustion characterized by low levels of NOx formation may be achieved by a two-stage precombustion chamber system while generating very high energy flame jets emerging from the second prechamber stage into the main combustion chamber. A first prechamber stage may be substantially smaller than a second prechamber stage.
    Type: Application
    Filed: October 14, 2017
    Publication date: February 8, 2018
    Inventors: Luigi P. Tozzi, Maria-Emmanuella Sotiropoulou, David Thomas Lepley
  • Patent number: 9874135
    Abstract: Generally, embodiments of a pre-chamber unit having a pre-combustion chamber including one or more induction ports in a configuration which achieves flow fields and flow field forces inside the pre-combustion chamber which act to direct flame growth away quenching surface of the pre-combustion chamber.
    Type: Grant
    Filed: October 28, 2015
    Date of Patent: January 23, 2018
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi
  • Patent number: 9850805
    Abstract: Generally, embodiments of a pre-chamber unit having a pre-combustion chamber including one or more induction ports in a configuration which achieves flow fields and flow field forces inside the pre-combustion chamber which act to direct flame growth away quenching surface of the pre-combustion chamber.
    Type: Grant
    Filed: November 1, 2015
    Date of Patent: December 26, 2017
    Assignee: Prometheus Applied Technologies, LLC
    Inventors: Maria-Emmanuella Sotiropoulou, Luigi P. Tozzi