Patents by Inventor Wai Yin Cedric Chan
Wai Yin Cedric Chan 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: 8192687Abstract: Prior to adding detergent or chelant, the conductivity of water in a washing chamber is measured. The maximum concentration of hard water ions that could correspond to the measured conductivity is determined, i.e., it is assumed that all of the conductivity is from calcium and/or magnesium ions in the water even though other ions may in fact be contributing to the measured conductivity. Enough chelating agent is added to the chamber to sequester this maximum concentration of hard water ions and the conductivity is measured again. Using the two conductivity measurements, the actual concentration of hard water ions is determined. A chelant factor based on the actual concentration of hard water ions is then used to determine the amount of chelant to be added for subsequent wash cycles to sequester all of the hard water ions.Type: GrantFiled: June 27, 2011Date of Patent: June 5, 2012Assignee: Diversey, Inc.Inventors: Wai Yin Cedric Chan, James W. Livingston, Patricia Anne Anderson
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Publication number: 20120031433Abstract: A method of determining one or more operational parameters of a washing system having a wash tank to which water and material are added. In one embodiment, the method includes monitoring a concentration of material, which is decreased at least partially due to water being added to the wash tank. The method also includes maintaining the concentration of material by dispensing material into the wash tank during a material dispensing operation. Additionally, the method includes generating a parameter indicative of a rate at which the material is dispensed during the material dispensing operation. The method also includes determining a presence of a water flow abnormality based at least partially on the generated parameter.Type: ApplicationFiled: August 16, 2011Publication date: February 9, 2012Applicant: Diversey, Inc.Inventors: Frederik J. SCHEPERS, Evert P. BAARS, Andrew J. COCKING, Wai Yin Cedric CHAN, James W. LIVINGSTON
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Publication number: 20110253606Abstract: Prior to adding detergent or chelant, the conductivity of water in a washing chamber is measured. The maximum concentration of hard water ions that could correspond to the measured conductivity is determined, i.e., it is assumed that all of the conductivity is from calcium and/or magnesium ions in the water even though other ions may in fact be contributing to the measured conductivity. Enough chelating agent is added to the chamber to sequester this maximum concentration of hard water ions and the conductivity is measured again. Using the two conductivity measurements, the actual concentration of hard water ions is determined. A chelant factor based on the actual concentration of hard water ions is then used to determine the amount of chelant to be added for subsequent wash cycles to sequester all of the hard water ions.Type: ApplicationFiled: June 27, 2011Publication date: October 20, 2011Inventors: Wai Yin Cedric Chan, James W. Livingston, Patricia Anne Anderson
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Patent number: 8002898Abstract: A method of determining one or more operational parameters of a washing system having a wash tank to which water and material are added. In one embodiment, the method includes monitoring a concentration of material, which is decreased at least partially due to water being added to the wash tank. The method also includes maintaining the concentration of material by dispensing material into the wash tank during a material dispensing operation. Additionally, the method includes generating a parameter indicative of a rate at which the material is dispensed during the material dispensing operation. The method also includes determining a presence of a water flow abnormality based at least partially on the generated parameter.Type: GrantFiled: December 19, 2007Date of Patent: August 23, 2011Assignee: Diversey, Inc.Inventors: Frederik J. Schepers, Evert P. Baars, Andrew J. Cocking, Wai Yin Cedric Chan, James W. Livingston
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Patent number: 7977101Abstract: Prior to adding detergent or chelant, the conductivity of water in a washing chamber is measured. The maximum concentration of hard water ions that could correspond to the measured conductivity is determined, i.e., it is assumed that all of the conductivity is from calcium and/or magnesium ions in the water even though other ions may in fact be contributing to the measured conductivity. Enough chelating agent is added to the chamber to sequester this maximum concentration of hard water ions and the conductivity is measured again. Using the two conductivity measurements, the actual concentration of hard water ions is determined. A chelant factor based on the actual concentration of hard water ions is then used to determine the amount of chelant to be added for subsequent wash cycles to sequester all of the hard water ions.Type: GrantFiled: March 9, 2010Date of Patent: July 12, 2011Assignee: Diversey, Inc.Inventors: Wai Yin Cedric Chan, James W. Livingston, Patricia Anne Anderson
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Publication number: 20100164515Abstract: Prior to adding detergent or chelant, the conductivity of water in a washing chamber is measured. The maximum concentration of hard water ions that could correspond to the measured conductivity is determined, i.e., it is assumed that all of the conductivity is from calcium and/or magnesium ions in the water even though other ions may in fact be contributing to the measured conductivity. Enough chelating agent is added to the chamber to sequester this maximum concentration of hard water ions and the conductivity is measured again. Using the two conductivity measurements, the actual concentration of hard water ions is determined. A chelant factor based on the actual concentration of hard water ions is then used to determine the amount of chelant to be added for subsequent wash cycles to sequester all of the hard water ions.Type: ApplicationFiled: March 9, 2010Publication date: July 1, 2010Inventors: Wai Yin Cedric Chan, James W. Livingston, Patricia Anne Anderson
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Patent number: 7709265Abstract: Prior to adding detergent or chelant, the conductivity of water in a washing chamber is measured. The maximum concentration of hard water ions that could correspond to the measured conductivity is determined, i.e., it is assumed that all of the conductivity is from calcium and/or magnesium ions in the water even though other ions may in fact be contributing to the measured conductivity. Enough chelating agent is added to the chamber to sequester this maximum concentration of hard water ions and the conductivity is measured again. Using the two conductivity measurements, the actual concentration of hard water ions is determined. A chelant factor based on the actual concentration of hard water ions is then used to determine the amount of chelant to be added for subsequent wash cycles to sequester all of the hard water ions.Type: GrantFiled: March 24, 2005Date of Patent: May 4, 2010Assignee: JohnsonDiversey, Inc.Inventors: Wai Yin Cedric Chan, James W. Livingston, Patricia Anne Anderson
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Patent number: 7654421Abstract: A dispensing system responds to reading data stored on a container by determining a dose for a chemical stored in that container. Then each time that the chemical is to be fed into a cleaning machine, the dispensing system operates a flow control device to deliver the designated dose. Thus the dispensing system is automatically reconfigured when different concentrations of the chemical are supplied to the dispensing system. Various mechanisms for storing the data on and reading the data from the container are described.Type: GrantFiled: June 1, 2006Date of Patent: February 2, 2010Assignee: JohnsonDiversey, Inc.Inventors: Wai Yin Cedric Chan, Andrew John Cocking, William Edward Simpson, Douglas Thomas Story
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Publication number: 20090159098Abstract: A method of determining one or more operational parameters of a washing system having a wash tank to which water and material are added. In one embodiment, the method includes monitoring a concentration of material, which is decreased at least partially due to water being added to the wash tank. The method also includes maintaining the concentration of material by dispensing material into the wash tank during a material dispensing operation. Additionally, the method includes generating a parameter indicative of a rate at which the material is dispensed during the material dispensing operation. The method also includes determining a presence of a water flow abnormality based at least partially on the generated parameter.Type: ApplicationFiled: December 19, 2007Publication date: June 25, 2009Applicant: JohnsonDiversey, Inc.Inventors: Frederik J. Schepers, Evert P. Baars, Andrew J. Cocking, Wai Yin Cedric Chan, James W. Livingston
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Patent number: 6529841Abstract: A conductivity measurement system provides one or more DC pulses to first and second electrodes submerged in an aqueous solution such as, for instance, the wash water of an industrial dishwasher. The voltage at the first electrode is measured at a sequence of at least three predetermined times after initiation of one of the DC pulse. A non-linear curve fitting function is applied to the sequence of at least three voltage measurements to calculate the voltage at the first electrode at the beginning of the DC pulse(s), commonly denoted as being at time t=0. The resulting calculated voltage at time t=0 is then used to calculate the conductivity of the solution, and/or to control operation of the a chemical dispenser, and/or to perform another predetermined system analysis or system control function.Type: GrantFiled: April 24, 2001Date of Patent: March 4, 2003Assignee: Johnson Diversey, Inc.Inventors: Andrew J. Cocking, Wai Yin Cedric Chan, James W. Livingston
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Publication number: 20010029435Abstract: A conductivity measurement system provides one or more DC pulses to first and second electrodes submerged in an aqueous solution such as, for instance, the wash water of an industrial dishwasher. The voltage at the first electrode is measured at a sequence of at least three predetermined times after initiation of one of the DC pulse. A non-linear curve fitting function is applied to the sequence of at least three voltage measurements to calculate the voltage at the first electrode at the beginning of the DC pulse(s), commonly denoted as being at time t=0. The resulting calculated voltage at time t=0 is then used to calculate the conductivity of the solution, and/or to control operation of the a chemical dispenser, and/or to perform another predetermined system analysis or system control function.Type: ApplicationFiled: April 24, 2001Publication date: October 11, 2001Inventors: Andrew J. Cocking, Wai Yin Cedric Chan, James W. Livingston
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Patent number: 6223129Abstract: A conductivity measurement system provides one or more DC pulses to first and second electrodes submerged in an aqueous solution such as, for instance, the wash water of an industrial dishwasher. The voltage at the first electrode is measured at first and second predetermined times after initiation of DC pulse(s). Linear regression of the first and second measured voltages is used to calculate the voltage at the first electrode at the beginning of the DC pulse(s), i.e., at time t=0. The resulting voltage at time t=0 is then used to calculate the conductivity of the solution, thereby compensating for the effects of polarization. Further, the difference between the respective first and second measured voltages is compared to a predetermined threshold value to determine whether the electrodes are so contaminated that polarization compensation is no longer feasible, thereby signaling that the electrodes should be cleaned or replaced.Type: GrantFiled: May 13, 1998Date of Patent: April 24, 2001Assignee: Diverseylever, Inc.Inventors: Wai Yin Cedric Chan, James W. Livingston