US Patent 7515991 Self-propelled cleaning device and method of operation thereof
Is a
Date Filed
March 17, 2004
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Date of Patent
April 7, 2009
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Patent Application Number
10801861
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Patent Inventor Names
Yutaka Arai
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Hirofumi Tanaka
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Ryoko Ichinose
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Saku Egawa
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Yasuhiro Asa
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Patent Jurisdiction
Patent Number
Patent Primary Examiner
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