Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/42—Details
  • A47L15/4295—Arrangements for detecting or measuring the condition of the crockery or tableware, e.g. nature or quantity
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
  • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
  • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
  • A47L15/0028—Washing phases
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
  • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
  • A47L15/0034—Drying phases, including dripping-off phases
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
  • A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane
  • A47L15/242—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane in a closed loop
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
  • A47L15/247—Details specific to conveyor-type machines, e.g. curtains
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/42—Details
  • A47L15/4285—Water-heater arrangements
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/42—Details
  • A47L15/4289—Spray-pressure measuring or regulating arrangements
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/42—Details
  • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/42—Details
  • A47L15/46—Devices for the automatic control of the different phases of cleaning ; Controlling devices
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/42—Details
  • A47L15/48—Drying arrangements
  • A47L15/486—Blower arrangements
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L15/00—Washing or rinsing machines for crockery or tableware
  • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
  • A47L2401/04—Crockery or tableware details, e.g. material, quantity, condition
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
  • A47L2401/30—Variation of electrical, magnetical or optical quantities
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
  • A47L2401/34—Other automatic detections
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
  • A47L2501/04—Water pressure or flow rate
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
  • A47L2501/06—Water heaters
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
  • A47L2501/07—Consumable products, e.g. detergent, rinse aids or salt
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
  • A47L2501/12—Air blowers
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
  • A47L2501/20—Spray nozzles or spray arms
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
  • A47L2501/24—Conveyor belts, e.g. conveyor belts motors
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
  • A47L2501/30—Regulation of machine operational steps within the washing process, e.g. performing an additional rinsing phase, shortening or stopping of the drying phase, washing at decreased noise operation conditions

Definitions

• This application relates generally to warewashers such as those used in commercial applications such as cafeterias and restaurants and, more particularly, to systems and methods to utilize radar for detecting and locating wares in connection with such warewashers.
• warewashers commonly include a housing which defines one or more internal washing and rinsing zones for dishes, pots pans and other wares.
• wares are moved through multiple different spray zones within the housing for cleaning (e.g., pre-wash, wash, post-wash (aka power rinse) and rinse zones), and potentially a drying zone as well.
• One or more of the spray zones includes a tank in which liquid to be sprayed on wares is heated in order to achieve desired cleaning.
• wares are typically manually moved into a generally stationary location within a chamber cleaning (e.g., wash sprays and rinse sprays are applied while the wares remain in the same, stationary location in the machine), and then the wares are manually removed from the machine upon completion of all operations/steps of the cleaning cycle.
• a chamber cleaning e.g., wash sprays and rinse sprays are applied while the wares remain in the same, stationary location in the machine
• a warewash machine for washing wares includes a housing defining a chamber for receiving wares, the chamber having at least one spray zone, a wash spray system for spraying wash liquid onto wares and a rinse spray system for spraying rinse liquid onto wares.
• At least one radar transceiver is located for detecting wares feeding into the chamber and/or for detecting wares within the chamber.
• a controller is associated with the radar transceiver and configured to identify one or more of ware location, ware movement, ware size, ware shape and/or ware material based upon outputs from the at least one radar transceiver.
• the controller is further configured to control at least one operating parameter of the machine based at least in part upon identified ware location, identified ware movement, identified ware size, identified ware shape and/or identified ware material such that the at least one operating parameter is suitable for the identified ware location, identified ware movement, identified ware size, identified ware shape and/or identified ware material.
• FIG. 1 is a schematic side elevation of one embodiment of a warewasher showing ware moving toward a radar transceiver;
• FIG. 2 is a schematic side elevation of one embodiment of a warewasher showing ware moving away from a radar transceiver;
• Fig. 3 is a graph comparing emitted radar energy (Io) with reflected radar energy (Ir).
• a warewash machine 10 includes a housing 12 defining an internal chamber 14 for receiving wares.
• the housing defines an inlet end 16 and outlet end 18 of the chamber (e.g., openings covered by curtains that enable wares to move into and out of the chamber, respectively).
• the chamber includes multiple spray zones 20, 22 and 24.
• zone 22 represents a main wash spray zone
• zone 24 represents a rinse spray zone downstream of the wash spray zone 22.
• Zone 20 may or may not be present, and could be a pre-wash zone and/or an automatic soil removal (ASR) zone.
• a drying zone 26 is located downstream of the rinse spray zone 24.
• the illustrated wash spray zone 22 includes a collection tank 30 with a heating element 32 for maintaining the wash liquid as a set temperature, which may be detected by a temperature sensor 34.
• a recirculation line 36 runs from the collection tank to multiple wash spray nozzles 38 (e.g., associated with upper and lower wash spray arms) and a wash pump 40 is located along the recirculation line.
• the rinse spray zone 24 includes a rinse valve or a rinse pump 42 for controlling flow of rinse liquid from a water heating unit 44 (e.g., a booster heater with associated heating element 46 and temperature sensor 47) along a rinse liquid line 48 to multiple rinse spray nozzles 50 (e.g., associated with upper and lower rinse spray arms).
• the water heating unit 44 receives water from a fresh water input of the machine.
• two fresh water inputs are provided (e.g., one for hot water and one for cool water, or one for tap water and one for softened water or demineralized water) and selection of the water input feed is by respective valves 49 and 51.
• the drying zone 26 including an air flow delivery system 52, which may include, for example one or more blowers 54 and one or more air heating elements 56, along with an air temperature sensor 58.
• a conveyor 60 is provided for carrying wares through the chamber for cleaning.
• the conveyor may be a continuous loop type conveyor or may be a reciprocating conveyor, in either case the movement of which is powered by a motor 62.
• the conveyor 60 includes a portion external of the chamber at the inlet end or infeed end to enable operators to place wares thereon for feeding into the chamber 14 by the conveyor.
• a controller 100 is provided for controlling operation of the machine 10, and may be connected to each machine component and each machine sensor as needed for such purpose.
• the term controller is intended to broadly encompass any circuit (e.g., solid state, application specific integrated circuit (ASIC), an electronic circuit, a combinational logic circuit, a field programmable gate array (FPGA)), processor(s) (e.g., shared, dedicated, or group - including hardware or software that executes code), software, firmware and/or other components, or a combination of some or all of the above, that carries out the control functions of the machine or the control functions of any component thereof.
• ASIC application specific integrated circuit
• FPGA field programmable gate array
• a chemical dosing circuit 64 includes a chemical valve or a chemical pump
• the dosing circuit feeds wash chemical (e.g., detergent) to the wash tank 30.
• wash chemical could be fed to the wash line 36.
• other chemical dosing circuits could also be provided (e.g., to feed wash chemicals to other wash zones and/or to feed a rinse chemical (e.g., rinse agent) to the rinse water unit 44 or the rinse water line 48).
• a radar transceiver 80 is provided for detecting wares feeding into the chamber.
• the term radar transceiver is broadly used to encompass a radar device in which the radar transmitter and radar receiver share some common circuitry, as well as a radar device in which a radar transmitter and a radar receiver are paired, but may not share common circuitry.
• one or more radar transceivers 82 could be located within the chamber 14 as shown. In both cases, the radar sensors 80 and 82 may be located outside of the ware path (e.g., to one side or above or below) and oriented to direct radar emissions toward the ware path for ware detection purposes.
• the radar transceiver(s) may, for example, be used for the purpose of identifying any one or more of ware location, ware movement, ware size, ware shape and/or ware material based upon outputs from the at least one radar transceiver (e.g., with the controller 100 receiving transceiver outputs and carrying out the identification).
• the controller 100 receiving transceiver outputs and carrying out the identification.
• the location of the ware at any time (Lt) in or on the warewash machine 10 can be determined based upon the duration of time (t) between radar transceiver emission of radar energy and subsequent reception the reflected radar energy per Equations (la) and (lb) below.
• the constant "2" is used in the equations because the radar energy travels out and back along its travel path from the transceiver, to the ware and back to the transducer after reflection.
• C is the known speed of the radar wave in an existing media, which is constant for the media.
• the speed may vary depending on location of radar transceiver in the machine because of the different moisture contents.
• the machine loading area external of the chamber at the inlet end is mostly room air with light moisture and may have refractive index close to 1, whereas inside the chamber a high level of moisture may exist, and hence the reflective index may be different from 1.
• speed of the radar wave may be different for the different zones in the machine but will typically be constant for each zone.
• the proper value for "C” can be predetermined for the various locations in the machine based upon testing, with the controller using the appropriate C value for each radar transceiver.
• Fig. 3 shows the duration t between radar emission and reflected radar reception by an exemplary graph 200.
• Equation (2b) and (2c) are defined from Equation (2a) and show the proportionality of the time difference At between ti and t 2 as a measure of ware location change (AL) between Li and L 2 of a ware moving toward a transceiver 80 as shown in Fig 1.
• the transceiver 80 emits radar energy 104 and receives back reflected radar energy 106 could be set to a maximum predetermined value T, where the ware reaching closer location L 2 after a predetermined time t p for the machine causes the controller to initiate the required machine processes for incoming ware.
• the radar emission 104 has a primary direction that is substantially opposite the conveying direction of the conveyor and travel direction of wares.
• a radar transceiver 112 is located at the far end of the machine infeed, with the ware moving away from the transceiver 112.
• Li For a minimum set distance Li from the transceiver 112 the difference in duration of time
• the radar transceiver 112 emits radar energy 114 and receives back reflected radar energy 116 could be set to a maximum predetermined value P where the ware at location L 2 after a predetermined time T p for the machine causes the controller to initiate the required machine processes for incoming ware.
• ti and t 2 correspond to Li and L 2 , respectively.
• Equations (3a) to (4a) will provide information on ware locations relative to a radar transceiver in or around a machine (e.g., regardless of whether the radar transceiver is in the chamber or outside of the chamber).
• the different location of the ware(s) may be used to control the machine effectively to achieve the desired wash quality while saving energy and maximizing the machine efficiency (e.g., turning certain operations ON/OFF as needed according to ware location).
• Radar reflection is a function of the nature of the surface and material type against which the radar energy impacts. In addition, different material thicknesses can result in different energy absorption, which also impacts the amount of reflected radar energy. A perfect reflection will result in the radar transceiver receiving sufficient reflected radar energy back while a diffuse reflection may not.
• the emitted energy (Io) incident on a ware or material is distributed into reflected energy (Ir), absorbed energy (la) and transmitted energy (It) as in Equations (5a) and (5b).
• Equation 5b (Ir/ Io) + (Ia/Io) + (It /Io)
• Ir/Io reflectivity
• Ia/Io absorptivity
• It/Io transmissivity
• the combined absorptivity and transmissivity can be defined as in Equation (5c) and can be used to differentiate ware materials, ware shape and/or ware location.
• the reflected energy is what goes back to the radar transceiver while the absorbed and transmitted energies are what the material absorbs and transmits,
• the graph 200 of Fig. 3 shows that the reflected energy received back by the radar transceiver is generally lower than that emitted.
• the different material types with different densities will result in different intensities of the reflected energy (Ir) as well as absorbed energy (Ia).
• the emitted energy (Io) compared with the reflected energy (Ir) (Fig. 3) is what is used to identify the different materials to control the machine efficiently for the necessary savings while achieving the wash quality while maximizing the machine productivity.
• an operational range of reflectivity, absorptivity or transmissivity that distinguishes each predetermined ware material type may be defined and used.
• reflectivity and combined absorptivity and transmissivity the following ranges could be defined for each material type with the following as examples.
• This functionality may typically employ sets of radar transceivers positioned to use either the reflected, absorbed or transmitted radar energy to determine the size and shape of wares.
• the same arrangement could also be used to determine material type and location.
• emitted radar energy with no ware interception will result in no reflected energy back to the radar transceiver(s).
• the various reflected energy from a ware is what defines the size and shape of the ware. Knowledge of the shape or size of the ware will enhance controlling the machine appropriately for the required wash quality and use of resources.
• the identified ware material type, size, conveyor ware load and/or ware speed can be used by the controller 100 as a measure of how much energy will be required to keep, for example, the wash tank 30, at the minimum required operating temperature, facilitating proper control of heating element 32.
• knowing the ware material type, shape, size and/or location will enable the controller 100 to control machine parameters to achieve expected wash quality while using resources accordingly.
• the radar transceiver(s) is/are ready for operation once the machine is ready to wash, and the transceivers are activated when the conveyor starts to move.
• the radar transceiver(s) once activated, emit and receive energy. Intersection of emitted energy with ware(s) produces reflected energy which is received by the
• transceiver(s) to determine the location, size, shape and/or material type of the ware.
• Processed radar emitted and received energy is used to control or regulate one or more of the machine operating parameters simultaneously or in series to better operate the machine to meet the need of the specific wares and includes, for example, regulating the conveyor speed to a constant speed or vary in between zones; regulating the heating elements to a constant temperature or vary in between zones; regulating wash pressures in the various zone by regulating the pump in the zones; regulating the rinse rate or rinse volume per rack or cycle for the different ware types, size and/or shape; regulating the rinse temperature for the different ware types, size and shape; changing the water input source if machine is connected with multiple water sources (e.g., tap water, softened water, demineralized water) based on ware types; regulating chemical dosage for washing, rinsing, sanitizing and/or deliming; and/or regulating blower dryer heat or air flow rate.
• water sources e.g., tap water, softened water, demineralized water
• the wares are mixed and sensing the same material over a predetermined time will switch the machine mode to better serve the material(s) to be washed or being washed until a new material(s) sensed switches the machine to suit the new material.
• Machine switches in-between modes to suit the ware material, shape, and size to optimize machine and use resources appropriately is thereby achieved.
• Scheduling of wares is possible across multiple manually or automatically fed machines based upon machine capacity, operational configuration (e.g. equipment package, chemicals, etc.), or other relevant status. Sorting of wares is also possible across multiple manually or automatically fed machines with the capacity or operational configuration (e.g. equipment package, chemicals, etc.), to wash a particular ware type.
• radar transceivers of the type commonly used in vehicle safety system, which radar transceivers tend to operate at frequencies in the 20-100 GHz range (e.g., commonly 60 - 90 GHz).
• frequencies in the 20-100 GHz range e.g., commonly 60 - 90 GHz.
• any frequency in the radar frequency range e.g., VHF, UHF, SHF or EHF may be used as determined to be suitable to the circumstances and requirements of a given warewash machine.

Applications Claiming Priority (2)

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• 2017
  • 2017-07-27 CN CN201780046621.5A patent/CN109475264A/zh active Pending
  • 2017-07-27 EP EP17749063.8A patent/EP3490421A1/de not_active Withdrawn
  • 2017-07-27 WO PCT/US2017/044081 patent/WO2018022833A1/en unknown
  • 2017-07-27 US US15/661,630 patent/US20180028043A1/en not_active Abandoned

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