Patent ID: 7168105

Claim:
A convertible multi-use writing instrument comprising: a cap comprising a first end and a second end; a tip comprising a writing end and a fastening end opposite the writing end; and a plug; the cap being operable to encapsulate at least the writing end of the tip to facilitate providing a quick-use arrangement; the fastening end of the tip being: fastenable to the plug to facilitate providing the quick-use arrangement; and fastenable to the first end of the cap to facilitate providing a full-size arrangement; and the second end of the cap being fastenable to the plug to facilitate providing the full-size arrangement; wherein: the fastening end of the tip comprises female threading; the first end of the cap comprises male threading; the plug comprises male threading and an o-ring; to facilitate providing the quick-use arrangement: the fastening end of the tip is fastenable to the plug using the female threading of the fastening end of the writing tip and the male threading of the plug; and the o-ring of the plug is operable to secure the tip in the cap when the tip is encapsulated in the cap; and to facilitate providing the full-size arrangement: the fastening end of the tip is fastenable to the first end of the cap using the female threading of the fastening end of the tip and the male threading of the first end of the cap; and the second end of the cap is fastenable to the plug using the o-ring of the plug.