US Patent 7852224 Door announcement system
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Patent abstract
A door announcement system for indicating the presence of a person or on animal outside a door includes at least one transmitting assembly sending an indicator signal when the at least one transmitting assembly is actuated. At least one receiving assembly engages an electrical outlet to provide power to the at least one receiving assembly. The at least one receiving assembly is in electrical communication with a lamp to turn the lamp on and off when the at least one receiving assembly receives the indicator signal.
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Patent Inventor Names
Donn A. Keehn, Sr.0
Randall S. Wilhelm0
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US Patent 07852224 Door announcement system US Patent 7852224 Door announcement system
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Patent Number
07852224
Patent Number
7852224
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Official Website
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US Patent 07852224 Door announcement system
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Is a
Patent jurisdiction
Patent number
07852224
Date of patent
December 14, 2010
Patent application number
11971729
Date Filed
January 9, 2008
Patent primary examiner
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