Abacus
Description
Claims
The ornamental design for an abacus, as shown and described.
Referenced Cited
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Patent History
Patent number: D797847
Type: Grant
Filed: Mar 16, 2016
Date of Patent: Sep 19, 2017
Inventor: Shi Zhang (Beijing)
Primary Examiner: Ian Simmons
Assistant Examiner: Mark Cavanna
Application Number: 29/558,322
Type: Grant
Filed: Mar 16, 2016
Date of Patent: Sep 19, 2017
Inventor: Shi Zhang (Beijing)
Primary Examiner: Ian Simmons
Assistant Examiner: Mark Cavanna
Application Number: 29/558,322
Classifications
Current U.S. Class:
Teaching Material (D19/59)