Writing instrument

Office supplies; artists and teachers materials – Equipment for writing – drawing – or for fine arts – Marking instrument

Design Patent

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Details

Design Patent

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D0575820

CLAIM:
The ornamental design for a writing instrument, as shown and described.

REFERENCES:
patent: D93736 (1934-10-01), Riddel
patent: D141858 (1945-07-01), Ullman
patent: D141859 (1945-07-01), Ullman
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patent: D507599 (2005-07-01), Qiu
patent: D539347 (2007-03-01), Hamilton
patent: D548791 (2007-08-01), Santa Maria et al.
patent: D557744 (2007-12-01), Lecce
patent: D563471 (2008-03-01), Qiu et al.
patent: D564025 (2008-03-01), Oas
patent: D565653 (2008-04-01), Freed et al.
patent: D565654 (2008-04-01), Siegel
patent: 3010217 (2003-01-01), None
patent: DM/064576 (2003-01-01), None

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