US4413168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating time coupling factor for microwave oven
Assignee: Raytheon Co
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Filing: 1982-03-08
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Granted: 1983-11-01
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Expires: 2002-03-08
Abstract
Abstract A microprocessor controlled microwave oven having a scale for providing a signal corresponding to the weight of a food body in the cavity to a microprocessor which calculates the microwave exposure time period as a nonlinear function of the weight. Generally, as the weight of the food body is increased, the time period of exposure per weight unit is decreased by a factor equal to the weight of the food divided by the weight of the food plus a constant where the constant may preferably be 0.1.
Inventors
- 👤 Wesley W. Teich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:51
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/6435; H05B6/6447; H05B6/645; H05B6/6452; H05B6/6464; H05B6/647; H05B6/6482; H05B6/72; H05B6/725; Y; Y10; Y10S; Y10S99/00; Y10S99/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A microwave oven comprising: a conductive cavity; a magnetron for supplying microwave energy to said conductive cavity; a weight sensitive device coupled to said cavity for generating a signal corresponding to the initial weight of food positioned in said cavity; and a microprocessor responsive to said signal and an operator actuated control corresponding to the initial temperature of said food for determining a time period of exposure of said food to microwave energy and for controlling said magnetron in accordance with said time period, said time period being determined as a nonlinear function of said initial weight and calculated by an equation including a denominator term equal to said initial food weight divided by the sum of said initial food weight plus a constant; wherein said constant corresponding to microwave energy losses to said oven, said losses being expressed in terms of equivalent food weight and said constant being approximately 0.1.
Claim 2
Dependent Claim
151 words
A microwave oven comprising: a conductive cavity; a magnetron for supplying microwave energy to said conductive cavity; a weight sensitive device coupled to said cavity for generating a signal corresponding to the initial weight of food positioned in said cavity; and a microprocessor responsive to said signal and an operator actuated control corresponding to the initial temperature of said food for determining a time period of exposure of said food to microwave energy and for controlling said magnetron in accordance with said time period, said time period being determined as a nonlinear function of said initial weight and calculated by an equation including a denominator term equal to said initial food weight divided by the sum of said initial food weight plus a constant; wherein said constant corresponding to microwave energy losses to said oven, said losses being expressed in terms of equivalent food weight and said constant being approximately 0.1.
Claim 3
Dependent Claim
157 words
A microwave oven comprising: a housing of substantially rectangular shape; a conductive cavity positioned in said housing; a source of microwave energy coupled to said cavity; a scale positioned in said housing and providing a signal corresponding to the initial weight of food positioned in said cavity; a microprocessor responsive to said signal and an operator actuated control corresponding to the initial temperature of said food for determining a time interval of exposure of said food to microwave energy, said time interval being determined as a nonlinear function of said initial weight and calculated by an equation including a denominator term equal to said initial weight divided by the sum of said initial weight plus a constant; wherein said constant corresponding to microwave energy losses to said oven, said losses being expressed in terms of equivalent food weight and said constant being approximately 0.1; and said microprocessor also controlling said source in accordance with said time interval.
Claim 4
Dependent Claim
157 words
A microwave oven comprising: a housing of substantially rectangular shape; a conductive cavity positioned in said housing; a source of microwave energy coupled to said cavity; a scale positioned in said housing and providing a signal corresponding to the initial weight of food positioned in said cavity; a microprocessor responsive to said signal and an operator actuated control corresponding to the initial temperature of said food for determining a time interval of exposure of said food to microwave energy, said time interval being determined as a nonlinear function of said initial weight and calculated by an equation including a denominator term equal to said initial weight divided by the sum of said initial weight plus a constant; wherein said constant corresponding to microwave energy losses to said oven, said losses being expressed in terms of equivalent food weight and said constant being approximately 0.1; and said microprocessor also controlling said source in accordance with said time interval.
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