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The ornamental design for a writing instrument, as shown and described.
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| Patent | Priority | Assignee | Title |
| D631508, | Oct 23 2009 | Klio-Eterna Schreibgerate GmbH & Co. KG | Writing pen |
| D642620, | Sep 27 2010 | Pagani Pens SA | Writing instrument |
| D646325, | Mar 23 2010 | Ritter-Pen GmbH | Ballpoint pen |
| D650012, | Oct 23 2009 | Ritter-Pen GmbH | Ballpoint pen |
| D663772, | Sep 16 2010 | Ritter Pen GmbH | Ballpoint pen |
| D687888, | Oct 18 2011 | Intermed Asia Limited | Pen |
| D688305, | Nov 06 2011 | Hangzhou Prostar Enterprises Ltd. | Ballpoint pen |
| D690359, | Nov 06 2011 | Hangzhou Prostar Enterprises Ltd. | Ballpoint pen |
| D694327, | Feb 02 2012 | Klio-Eterna Schreibgerate GmbH & Co KG | Ballpoint pen |
| D700238, | Apr 20 2012 | Klio-Eterna Schreibgeräte GmbH & Co. KG | Ballpoint pen |
| D706347, | Feb 02 2012 | Klio-Eterna Schreibgeräte GmbH & Co KG | Ballpoint pen |
| D765784, | Sep 24 2015 | Ballpoint pen |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Sep 18 2006 | Senator GmbH & Co. KGaA | (assignment on the face of the patent) | / | |||
| Oct 06 2007 | ROMMEL, VOLKMAR | SENATOR GMBH & CO KGAA | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 020046 | /0565 |
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