Patents by Inventor Calvin Y. Chow
Calvin Y. Chow 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: 7663755Abstract: Photometric methods for determining optical pathlength of liquid samples containing analytes dissolved or suspended in a solvent are provided that rely on determining a relationship between the light absorption properties of the solvent and the optical pathlength of liquid samples containing the solvent. This relationship is used to establish the optical pathlength for samples containing an unknown concentration of analyte but having similar solvent composition. Methods are also provided for determining the concentration of analyte in such samples where both the optical pathlength and the concentration of analyte are unknown. The methods may rely on separately determining, at different wavelengths of light, light absorption by the solvent and light absorption by the analyte. Light absorption by the analyte, together with the optical pathlength so determined, is used to calculate the concentration of the analyte.Type: GrantFiled: February 25, 2008Date of Patent: February 16, 2010Assignee: MDS Analytical Technologies (US) Inc.Inventors: Dean G. Hafeman, Calvin Y. Chow
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Publication number: 20080285036Abstract: Disclosed are photometric methods and devices for determining optical pathlength of liquid samples containing analytes dissolved or suspended in a solvent. The methods and devices rely on determining a relationship between the light absorption properties of the solvent and the optical pathlength of liquid samples containing the solvent. This relationship is used to establish the optical pathlength for samples containing an unknown concentration of analyte but having similar solvent composition. Further disclosed are methods and devices for determining the concentration of analyte in such samples where both the optical pathlength and the concentration of analyte are unknown. The methods and devices rely on separately determining, at different wavelengths of light, light absorption by the solvent and light absorption by the analyte. Light absorption by the analyte, together with the optical pathlength so determined, is used to calculate the concentration of the analyte.Type: ApplicationFiled: February 25, 2008Publication date: November 20, 2008Applicant: Molecular Devices CorporationInventors: Dean G. Hafeman, Calvin Y. Chow
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Patent number: 6995844Abstract: Disclosed are photometric methods and devices for determining optical pathlength of liquid samples containing analytes dissolved or suspended in a solvent. The methods and devices rely on determining a relationship between the light absorption properties of the solvent and the optical pathlength of liquid samples containing the solvent. This relationship is used to establish the optical pathlength for samples containing an unknown concentration of analyte but having similar solvent composition. Further disclosed are methods and devices for determining the concentration of analyte in such samples where both the optical pathlength and the concentration of analyte are unknown. The methods and devices rely on separately determining, at different wavelengths of light, light absorption by the solvent and light absorption by the analyte. Light absorption by the analyte, together with the optical pathlength so determined, is used to calculate the concentration of the analyte.Type: GrantFiled: December 10, 2002Date of Patent: February 7, 2006Assignee: Molecular Devices CorporationInventors: Dean G. Hafeman, Calvin Y. Chow
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Patent number: 6693709Abstract: The present invention relates to a photometric device for measuring optical parameters. The invention functions in the ultraviolet light range through use of a monochromator and splits the test light in multiple channels by a rotor assembly, including a mirror.Type: GrantFiled: October 7, 2002Date of Patent: February 17, 2004Assignee: Molecular Devices CorporationInventors: Mark Wechsler, Howard H. Barney, Roger A. Kaye, David G. Ogle, Michael M. Lacy, Calvin Y. Chow, Kimberly L. Crawford, Dean G. Hafeman
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Publication number: 20030160961Abstract: Disclosed are photometric methods and devices for determining optical pathlength of liquid samples containing analytes dissolved or suspended in a solvent. The methods and devices rely on determining a relationship between the light absorption properties of the solvent and the optical pathlength of liquid samples containing the solvent. This relationship is used to establish the optical pathlength for samples containing an unknown concentration of analyte but having similar solvent composition. Further disclosed are methods and devices for determining the concentration of analyte in such samples where both the optical pathlength and the concentration of analyte are unknown. The methods and devices rely on separately determining, at different wavelengths of light, light absorption by the solvent and light absorption by the analyte. Light absorption by the analyte, together with the optical pathlength so determined, is used to calculate the concentration of the analyte.Type: ApplicationFiled: December 10, 2002Publication date: August 28, 2003Applicant: Molecular Devices CorporationInventors: Dean Hafeman, Calvin Y. Chow
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Publication number: 20030081207Abstract: The present invention relates to a photometric device for measuring optical parameters. The invention functions in the ultraviolet light range through use of a monochromator and splits the test light in multiple channels by a rotor assembly, including a mirror.Type: ApplicationFiled: October 7, 2002Publication date: May 1, 2003Inventors: Mark Wechsler, Howard H. Barney, Roger A. Kaye, David G. Ogle, Michael M. Lacy, Calvin Y. Chow, Kimberly L. Crawford, Dean G. Hafeman
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Patent number: 6496260Abstract: Disclosed are photometric methods and devices for determining optical pathlength of liquid samples containing analytes dissolved or suspended in a solvent. The methods and devices rely on determining a relationship between the light absorption properties of the solvent and the optical pathlength of liquid samples containing the solvent. This relationship is used to establish the optical pathlength for samples containing an unknown concentration of analyte but having similar solvent composition. Further disclosed are methods and devices for determining the concentration of analyte in such samples where both the optical pathlength and the concentration of analyte are unknown. The methods and devices rely on separately determining, at different wavelengths of light, light absorption by the solvent and light absorption by the analyte. Light absorption by the analyte, together with the optical pathlength so determined, is used to calculate the concentration of the analyte.Type: GrantFiled: December 23, 1998Date of Patent: December 17, 2002Assignee: Molecular Devices Corp.Inventors: Dean G. Hafeman, Calvin Y. Chow
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Patent number: 6404501Abstract: Disclosed are photometric methods and devices for determining optical pathlength of liquid samples containing analytes dissolved or suspended in a solvent. The methods and devices rely on determining a relationship between the light absorption properties of the solvent and the optical pathlength of liquid samples containing the solvent. This relationship is used to establish the optical pathlength for samples containing an unknown concentration of analyte but having similar solvent composition. Further disclosed are methods and devices for determining the concentration of analyte in such samples where both the optical pathlength and the concentration of analyte are unknown. The methods and devices rely on separately determining, at different wavelengths of light, light absorption by the solvent and light absorption by the analyte. Light absorption by the analyte, together with the optical pathlength so determined, is used to calculate the concentration of the analyte.Type: GrantFiled: September 27, 2000Date of Patent: June 11, 2002Assignee: Molecular Devices CorporationInventors: Dean G. Hafeman, Calvin Y. Chow
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Patent number: 6151111Abstract: The present invention relates to a photometric device for measuring optical parameters. The invention functions in the ultraviolet light range through use of a monochromator and splits the test light in multiple channels by a rotor assembly, including a mirror.Type: GrantFiled: September 15, 1997Date of Patent: November 21, 2000Assignee: Molecular Devices CorporationInventors: Mark Wechsler, Howard H. Barney, Roger A. Kaye, David G. Ogle, Michael M. Lacy, Calvin Y. Chow, Kimberly L. Crawford, Dean G. Hafeman
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Patent number: 5557398Abstract: The present invention relates to a photometric device for measuring optical parameters. The invention functions in the ultraviolet light range through use of a monochromator and splits the test light in multiple channels by a rotor assembly, including a mirror.Type: GrantFiled: April 15, 1994Date of Patent: September 17, 1996Assignee: Molecular Devices CorporationInventors: Mark Wechsler, Howard H. Barney, Roger A. Kaye, David G. Ogle, Michael M. Lacy, Calvin Y. Chow, Kimberly L. Crawford, Dean G. Hafeman