Back to results
US 4,017,871 AGranted
Marker with three phase ink circuit
AssigneeGraphic Controls Corporation
InventorJames R. Hubbard
Life of this patent
Estimating the term…
Abstract
Marker includes a three-phase ink circuit to transport ink from a large capacity reservoir through an intermediate capillary phase to a generally porous writing tip. Each phase of the ink circuit contains capillary ink transporting material. Arrangement of the phases in order of increasing capillarity draws ink from the low capillarity reservoir through a small diameter intermediate conduit to the generally porous writing tip.
Claims13
A pen, designed to include a writing tip remote from the pen's ink supply, including in combination:
- a. a reservoir body;
- b. capillary reservoir material, housed inside of said reservoir body, having a degree of capillarity suitable to retain an ink supply under normal handling, yet able to release the ink to a member of preferred capillarity;
- c. an intermediate conduit having a distal end and a proximal end;
- d. intermediate capillary material, housed inside of said intermediate conduit having a higher degree of capillarity than said capillary reservoir material, said intermediate capillary material to have both a distal and proximal end;
- e. a generally porous writing tip, having a higher degree of capillarity than said intermediate capillary material, said distal end of said intermediate capillary mating with said capillary reservoir material, and said proximal end of said intermediate capillary material mating with said writing tip.
2 more elements
Dependencies are inferred from the claim text.