Patents by Inventor David L Herman
David L Herman 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: 10527530Abstract: A venting cap is disclosed for pressure vessels for microwave-assisted chemistry. The venting cap includes a flexible circular cover for closing the mouth of a reaction vessel, a flexible annular wall depending from the circular cover, and a flexible annular ring at the bottom of the annular wall and parallel to the circular cover for positioning the cap on a reaction vessel. At least one indentation in the circular cover minimizes distortion when any contents of a reaction vessel exert pressure against the cap, and at least one opening in the annular wall provides a ventilation path through the cap when gas pressure in a reaction vessel flexes the cap sufficiently to partially disengage at least a portion of the cap from the mouth of the reaction vessel.Type: GrantFiled: April 12, 2018Date of Patent: January 7, 2020Inventors: David A. Barclay, Joseph J. Lambert, William E. Jennings, David L. Herman
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Patent number: 10421775Abstract: A precision volumetric liquid dispensing instrument is disclosed that includes two pressure sensors and a fluid passageway with a defined volume portion in communication with the two sensors for receiving and distributing liquid in relatively small volumes. One of the pressure sensors is positioned to measure pressure at one portion of the defined volume portion of the fluid passageway and the other of the gas pressure sensors is positioned to measure gas pressure at a different portion of the defined volume portion of the passageway. At least one valve is in communication with the passageway for moving fluids into or out of the defined volume portion of the fluid passageway, and a processor carries out a step selected from the group consisting of (i) calculating the volume of the liquid based upon the measured pressure and (ii) metering a liquid into the defined volume portion of the fluid passageway until the measured pressure indicates that a desired volume of fluid is in the fluid passageway.Type: GrantFiled: December 16, 2016Date of Patent: September 24, 2019Assignee: CEM CorporationInventors: David L. Herman, Joseph J. Lambert
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Patent number: 10067043Abstract: An instrument and method for high pressure microwave assisted chemistry are disclosed. The method includes the steps of applying microwave radiation to a sample in a sealed vessel while measuring the temperature of the sample and measuring the pressure generated inside the vessel and until the measured pressure reaches a designated set point, opening the vessel to release gases until the pressure inside the vessel reaches a lower designated set point, closing the vessel, and repeating the steps of opening the vessel at designated pressure set points and closing the vessel at designated pressure set points to the sample until the sample reaction reaches a designated high temperature. The designated set points can controllably differ from one another as the reaction proceeds. Microwave energy can be applied continuously or intermittently during the opening and closing steps.Type: GrantFiled: December 30, 2016Date of Patent: September 4, 2018Assignee: CEM CorporationInventors: David A. Barclay, Joseph J. Lambert, William E. Jennings, David L. Herman
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Publication number: 20180229208Abstract: A venting cap is disclosed for pressure vessels for microwave-assisted chemistry. The venting cap includes a flexible circular cover for closing the mouth of a reaction vessel, a flexible annular wall depending from the circular cover, and a flexible annular ring at the bottom of the annular wall and parallel to the circular cover for positioning the cap on a reaction vessel. At least one indentation in the circular cover minimizes distortion when any contents of a reaction vessel exert pressure against the cap, and at least one opening in the annular wall provides a ventilation path through the cap when gas pressure in a reaction vessel flexes the cap sufficiently to partially disengage at least a portion of the cap from the mouth of the reaction vessel.Type: ApplicationFiled: April 12, 2018Publication date: August 16, 2018Applicant: CEM CorporationInventors: David A. Barclay, Joseph J. Lambert, William E. Jennings, David L. Herman
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Patent number: 9943823Abstract: An instrument and method for high pressure microwave assisted chemistry are disclosed. The method includes the steps of applying microwave radiation to a sample in a sealed vessel while measuring the temperature of the sample and measuring the pressure generated inside the vessel and until the measured pressure reaches a designated set point, opening the vessel to release gases until the pressure inside the vessel reaches a lower designated set point, closing the vessel, and repeating the steps of opening the vessel at designated pressure set points and closing the vessel at designated pressure set points to the sample until the sample reaction reaches a designated high temperature. The designated set points can controllably differ from one another as the reaction proceeds. Microwave energy can be applied continuously or intermittently during the opening and closing steps.Type: GrantFiled: December 16, 2015Date of Patent: April 17, 2018Assignee: CEM CorporationInventors: David A. Barclay, Joseph J. Lambert, William E. Jennings, David L. Herman
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Publication number: 20170108415Abstract: An instrument and method for high pressure microwave assisted chemistry are disclosed. The method includes the steps of applying microwave radiation to a sample in a sealed vessel while measuring the temperature of the sample and measuring the pressure generated inside the vessel and until the measured pressure reaches a designated set point, opening the vessel to release gases until the pressure inside the vessel reaches a lower designated set point, closing the vessel, and repeating the steps of opening the vessel at designated pressure set points and closing the vessel at designated pressure set points to the sample until the sample reaction reaches a designated high temperature. The designated set points can controllably differ from one another as the reaction proceeds. Microwave energy can be applied continuously or intermittently during the opening and closing steps.Type: ApplicationFiled: December 30, 2016Publication date: April 20, 2017Applicant: CEM CorporationInventors: David A. Barclay, Joseph J. Lambert, William E. Jennings, David L. Herman
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Publication number: 20170096447Abstract: A precision volumetric liquid dispensing instrument is disclosed that includes two pressure sensors and a fluid passageway with a defined volume portion in communication with the two sensors for receiving and distributing liquid in relatively small volumes. One of the pressure sensors is positioned to measure pressure at one portion of the defined volume portion of the fluid passageway and the other of the gas pressure sensors is positioned to measure gas pressure at a different portion of the defined volume portion of the passageway. At least one valve is in communication with the passageway for moving fluids into or out of the defined volume portion of the fluid passageway, and a processor carries out a step selected from the group consisting of (i) calculating the volume of the liquid based upon the measured pressure and (ii) metering a liquid into the defined volume portion of the fluid passageway until the measured pressure indicates that a desired volume of fluid is in the fluid passageway.Type: ApplicationFiled: December 16, 2016Publication date: April 6, 2017Applicant: CEM CorporationInventors: David L. Herman, Joseph J. Lambert
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Publication number: 20170095786Abstract: A precision volumetric liquid dispensing instrument is disclosed that includes two pressure sensors and a fluid passageway with a defined volume portion in communication with the two sensors for receiving and distributing liquid in relatively small volumes. One of the pressure sensors is positioned to measure pressure at one portion of the defined volume portion of the fluid passageway and the other of the gas pressure sensors is positioned to measure gas pressure at a different portion of the defined volume portion of the passageway. At least one valve is in communication with the passageway for moving fluids into or out of the defined volume portion of the fluid passageway, and a processor carries out a step selected from the group consisting of (i) calculating the volume of the liquid based upon the measured pressure and (ii) metering a liquid into the defined volume portion of the fluid passageway until the measured pressure indicates that a desired volume of fluid is in the fluid passageway.Type: ApplicationFiled: December 16, 2016Publication date: April 6, 2017Applicant: CEM CorporationInventors: David L. Herman, Joseph J. Lambert
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Patent number: 9522380Abstract: A precision volumetric liquid dispensing instrument is disclosed that includes two pressure sensors and a fluid passageway with a defined volume portion in communication with the two sensors for receiving and distributing liquid in relatively small volumes. One of the pressure sensors is positioned to measure pressure at one portion of the defined volume portion of the fluid passageway and the other of the gas pressure sensors is positioned to measure gas pressure at a different portion of the defined volume portion of the passageway. At least one valve is in communication with the passageway for moving fluids into or out of the defined volume portion of the fluid passageway, and a processor carries out a step selected from the group consisting of (i) calculating the volume of the liquid based upon the measured pressure and (ii) metering a liquid into the defined volume portion of the fluid passageway until the measured pressure indicates that a desired volume of fluid is in the fluid passageway.Type: GrantFiled: June 20, 2013Date of Patent: December 20, 2016Assignee: CEM CorporationInventors: David L. Herman, Joseph J. Lambert
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Publication number: 20160096162Abstract: An instrument and method for high pressure microwave assisted chemistry are disclosed. The method includes the steps of applying microwave radiation to a sample in a sealed vessel while measuring the temperature of the sample and measuring the pressure generated inside the vessel and until the measured pressure reaches a designated set point, opening the vessel to release gases until the pressure inside the vessel reaches a lower designated set point, closing the vessel, and repeating the steps of opening the vessel at designated pressure set points and closing the vessel at designated pressure set points to the sample until the sample reaction reaches a designated high temperature. The designated set points can controllably differ from one another as the reaction proceeds. Microwave energy can be applied continuously or intermittently during the opening and closing steps.Type: ApplicationFiled: December 16, 2015Publication date: April 7, 2016Applicant: CEM CorporationInventors: David A. Barclay, Joseph J. Lambert, William E. Jennings, David L. Herman
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Patent number: 9237608Abstract: An instrument and method for high pressure microwave assisted chemistry are disclosed. The method includes the steps of applying microwave radiation to a sample in a sealed vessel while measuring the temperature of the sample and measuring the pressure generated inside the vessel and until the measured pressure reaches a designated set point, opening the vessel to release gases until the pressure inside the vessel reaches a lower designated set point, closing the vessel, and repeating the steps of opening the vessel at designated pressure set points and closing the vessel at designated pressure set points to the sample until the sample reaction reaches a designated high temperature. The designated set points can controllably differ from one another as the reaction proceeds. Microwave energy can be applied continuously or intermittently during the opening and closing steps.Type: GrantFiled: August 14, 2009Date of Patent: January 12, 2016Assignee: CEM CorporationInventors: David A. Barclay, Joseph J Lambert, William E. Jennings, David L. Herman
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Publication number: 20150301061Abstract: A dye binding method for protein analysis is disclosed. The method includes the steps of preparing an initial reference dye solution of unknown concentration from an initial reference dye concentrate and creating an electronic signal based upon the absorbance of the initial reference dye solution. Thereafter, an electronic signal is created based upon the absorbance of a dye filtrate solution prepared from the initial reference dye solution and an initial protein sample. The absorbance signals from the reference dye solution and the dye filtrate solution are sent to a processor that compares the respective absorbances and calculates the protein content of the protein sample based upon the difference between the absorbances.Type: ApplicationFiled: June 29, 2015Publication date: October 22, 2015Applicant: CEM CORPORATIONInventors: Michael J. Collins, SR., Joseph J. Lambert, Timothy A. Zawatsky, David L. Herman
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Patent number: 9091632Abstract: A dye binding method for protein analysis is disclosed. The method includes the steps of preparing an initial reference dye solution of unknown concentration from an initial reference dye concentrate and creating an electronic signal based upon the absorbance of the initial reference dye solution. Thereafter, an electronic signal is created based upon the absorbance of a dye filtrate solution prepared from the initial reference dye solution and an initial protein sample. The absorbance signals from the reference dye solution and the dye filtrate solution are sent to a processor that compares the respective absorbances and calculates the protein content of the protein sample based upon the difference between the absorbances.Type: GrantFiled: September 27, 2013Date of Patent: July 28, 2015Assignee: CEM CorporationInventors: Michael J Collins, Sr., Joseph J Lambert, Timothy A Zawatsky, David L Herman
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Publication number: 20140374238Abstract: A precision volumetric liquid dispensing instrument is disclosed that includes two pressure sensors and a fluid passageway with a defined volume portion in communication with the two sensors for receiving and distributing liquid in relatively small volumes. One of the pressure sensors is positioned to measure pressure at one portion of the defined volume portion of the fluid passageway and the other of the gas pressure sensors is positioned to measure gas pressure at a different portion of the defined volume portion of the passageway. At least one valve is in communication with the passageway for moving fluids into or out of the defined volume portion of the fluid passageway, and a processor carries out a step selected from the group consisting of (i) calculating the volume of the liquid based upon the measured pressure and (ii) metering a liquid into the defined volume portion of the fluid passageway until the measured pressure indicates that a desired volume of fluid is in the fluid passageway.Type: ApplicationFiled: June 20, 2013Publication date: December 25, 2014Inventors: David L. Herman, Joseph J. Lambert
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Patent number: 8852948Abstract: A protein analysis instrument and method are disclosed. The method includes mixing a binding dye composition and a protein sample using a homogenizer, measuring a parameter selected from the group consisting of the speed of the homogenizer and the resistance of the mixture to the homogenizer, adjusting the speed of the homogenizer based upon the measured parameter, pumping unreacted dye composition from the mixture and to a calorimeter, and measuring the absorbance of the dye composition in the calorimeter. Aspects of the invention also include inserting a spout into a sample cup at a position where the spout opening is positioned to avoid foam and precipitate generated by the mixing step and above the bottom of the sample cup and thereafter pumping the dye composition from the mixture in the sample cup through the spout and to a colorimeter.Type: GrantFiled: August 4, 2008Date of Patent: October 7, 2014Assignee: CEM CorporationInventors: Michael J. Collins, Sr., Joseph J. Lambert, Timothy A. Zawatsky, David L. Herman
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Patent number: 8663993Abstract: A dye binding method for protein analysis is disclosed. The method includes the steps of preparing an initial reference dye solution of unknown concentration from an initial reference dye concentrate and creating an electronic signal based upon the absorbance of the initial reference dye solution. Thereafter, an electronic signal is created based upon the absorbance of a dye filtrate solution prepared from the initial reference dye solution and an initial protein sample. The absorbance signals from the reference dye solution and the dye filtrate solution are sent to a processor that compares the respective absorbances and calculates the protein content of the protein sample based upon the difference between the absorbances.Type: GrantFiled: March 11, 2010Date of Patent: March 4, 2014Assignee: CEM CorporationInventors: Michael J Collins, Sr., Joseph J Lambert, Timothy A Zawatsky, David L Herman
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Publication number: 20140024120Abstract: A dye binding method for protein analysis is disclosed. The method includes the steps of preparing an initial reference dye solution of unknown concentration from an initial reference dye concentrate and creating an electronic signal based upon the absorbance of the initial reference dye solution. Thereafter, an electronic signal is created based upon the absorbance of a dye filtrate solution prepared from the initial reference dye solution and an initial protein sample. The absorbance signals from the reference dye solution and the dye filtrate solution are sent to a processor that compares the respective absorbances and calculates the protein content of the protein sample based upon the difference between the absorbances.Type: ApplicationFiled: September 27, 2013Publication date: January 23, 2014Applicant: CEM Corp.Inventors: Michael J Collins, Sr., Joseph J Lambert, Timothy A Zawatsky, David L Herman
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Patent number: 8147759Abstract: A direct rapid automated protein analyzer is disclosed. The protein analyzer includes means for reducing protein samples to small particles, a reaction vessel in material transfer communication with the homogenizer, a reservoir for binding dye composition in fluid communication with the reaction vessel, a metering pump in fluid communication with the reservoir and the reaction vessel for distributing discrete predetermined amounts of a binding dye composition to the reaction vessel, a filter in fluid communication with the reaction vessel for separating solids from filtrate after a dye binding reaction has taken place in the reaction vessel, and a calorimeter in fluid communication with the filter and the reaction vessel for measuring the absorbance of the filtrate from the reaction vessel and the filter. The rapid analyzer can be used in conjunction with a kit that includes a sample cup for mixing a protein sample with a dye-binding solution and a filter holder for being positioned in the sample cup.Type: GrantFiled: August 29, 2007Date of Patent: April 3, 2012Assignee: CEM CorporationInventors: Michael J. Collins, Sr., Joseph J. Lambert, Timothy A. Zawatsky, David L. Herman
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Publication number: 20120074136Abstract: An instrument and method for high pressure microwave assisted chemistry are disclosed. The method includes the steps of applying microwave radiation to a sample in a sealed vessel while measuring the temperature and pressure generated inside the vessel and until the measured pressure reaches a designated set point, opening the vessel to release gases until the pressure inside the vessel reaches a lower set point, closing the vessel, and repeating the steps of opening the vessel at designated pressure set points and closing the vessel at designated pressure set points to the sample until the sample reaction reaches a designated high temperature. Microwave energy can be applied continuously or intermittently during the opening and closing steps. Among other items, the instrument includes pressure and temperature sensors and means for opening and closing the vessel at the set points.Type: ApplicationFiled: September 22, 2011Publication date: March 29, 2012Applicant: CEM CORPORATIONInventors: David A. Barclay, Joseph J. Lambert, William E. Jennings, David L. Herman
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Patent number: 7968344Abstract: A protein analysis kit is disclosed. The kit includes a sample cup for mixing a protein sample with a dye-binding solution and a filter holder for being positioned in the sample cup. The filter holder includes a filter media and a depending spout below the filter media that reaches bottom portions of the cup when the filter media is positioned above the cup.Type: GrantFiled: March 11, 2010Date of Patent: June 28, 2011Assignee: CEM CorporationInventors: Michael J Collins, Sr., Joseph J Lambert, Timothy A Zawatsky, David L Herman