Self-sealing retractable writing instrument

Details Self-sealing retractable writing instrument Self-sealing retractable writing instrument

2006-06-13

2006-06-13

Walczak, David J. (Department: 3751)

Coating implements with material supply

Projectable and retractable tool

With movable closure or gate

C401S109000

Reexamination Certificate

active

07059796

ABSTRACT:
A retractable writing instrument that substantially prevents writing fluid from evaporating through the tip when the tip is in a retracted position to eliminate the need for a cap. Within the writing instrument is an enclosure member that has a vapor chamber. In the retracted position, the tip of the writing instrument is within the vapor chamber to substantially seal the tip from ambient air so that writing fluid does not evaporate through the tip. The enclosure member has a lip that opens to allow the tip to move forward and extend from the writing instrument so that writing fluid can be delivered to the writing surface for writing. When the tip is moved back into the retracted position the lip closes to substantially seal the tip from the ambient air. An external compression force may be applied to the lip to assist in sealing the lip. The enclosure member may be made of a material that is durable so that the lip does not wear out after many cycles of moving the tip between the retracted and protracted positions, such as silicone, butyl rubber, and thermoplastic vulcanizate (TPV) material including butyl rubber cross-linked with polypropylene.

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