Stephen Alan Levie - Burnsville MN Bradley Dale Brown - Minnetonka MN Gregory John Loxtercamp - Minneapolis MN Michael E. Hermansen - Shorewood MN Emmett E. O'Hare - Eden Prairie MN Ahmad Ghanbarzadeh - Eden Prairie MN
Assignee:
IVI Checkmate Inc.
International Classification:
G06K 710
US Classification:
23546247
Abstract:
A modular terminal apparatus including a core unit interchangeable with a plurality of communication modules.
A power supply circuit for a microwave oven which includes a magnetron, a transformer, a plural capacitor, and a current rectifier. The power supply circuit is particularly adapted to provide constant power output from the magnetron using either a 50Hz or 60Hz input power by selecting an appropriate one of said plural capacitances.
A front programmable timer provides for the programming, selecting, and operating according to desired operating times in a set of input switches for a microwave oven controller. Retention of the times programmed is provided for in the event of loss of power. A TEST mode provides for exercising a visible display, an audible indicator and a microwave command output signal from the controller. A tamper-proof switch assembly is provided to select OPERATE or PROGRAM modes.
Stephen A. Levie - Burnsville MN William E. Taylor - Golden Valley MN
Assignee:
Litton Systems, Inc. - Beverly Hills CA
International Classification:
H05B 3700 H05B 4114
US Classification:
315101
Abstract:
A mode detector for microwave oven magnetrons is disclosed including means for sensing interruption of anode current and providing a discrete indication thereof. An alternative embodiment discloses means to count the number of such interruptions. A method of detecting incipient failure of the magnetron is disclosed wherein the discrete output of a mode detector is observed and a determination is made that an incipient failure exists when the mode detector output frequency exceeds a predetermined limit.