Patent ID: 8393814

Claim:
A cap-less retractable writing instrument comprising: a writing nib extending from a reservoir holder; a valve and a lid selectively sealing the writing nib, the valve and the lid being disposed on one end of the reservoir holder; and a closure assembly comprising: a closure ring; a retention ring spaced apart from the closure ring; at least one closure arm connecting the closure ring and the retention ring; a curved cam surface on an inner surface of the at least one closure arm, the curved cam surface interacting with the lid during protraction of the lid to open the lid prior to the nib contacting the lid; and at least one tab on the lid, the at least one tab riding on the cam surface during protraction of the nib, wherein the closure assembly retains the valve, the closure assembly being secured to the reservoir holder by a retention stop disposed on the reservoir holder, the retention stop being integral with the reservoir holder.