Dispenser for error correcting fluids

Claim 2

Apparatus for dispensing a volatile pigmented fluid comprising: an elongated housing; a fluid dispensing opening at the lower end of the housing; a valve adjacent the fluid dispensing opening which includes a valve seat formed by the interior wall of the opening, a valve stem having an annular sealing surface urged against the valve seat by a spring member, and spring retaining means; a capillary vent positioned at the upper end of the housing; and a partition interposed between the valve and the capillary vent and including a passage therethrough sized to prevent counter-current flow of air and volatile pigmented fluid.

Claim 3

The apparatus of claim 1 including a cap member having a rod-like portion extending into the interior of the housing and wherein the upper end of the housing has a solid portion with a cylindrical bore therethrough and wherein the capillary vent is formed by a capillary size space between the rod-like portion of the cap member and the cylindrical bore.

Claim 4

The apparatus of claim 2 wherein the cap member rod portion has an upper end having a diameter approximately equal to the diameter of the cylindrical bore so as to provide a slidable friction fit between the cylindrical bore and the rod portion and wherein the section of the rod portion below the rod portion upper end and within the cylindrical bore is generally cylindrical and has a flat side.

Claim 5

The apparatus of claim 3 wherein the cap member has an upper and lower position relative to the housing and including means for limiting upward movement of the cap member relative to the housing.

Claim 6

The apparatus of claim 4 wherein the cap member rod portion has a lower end sized to fit into and plug the partitIon passage when the cap member is in the lower position.

Claim 7

Apparatus for dispensing a fluid which includes a pigment and volatile solvent comprising: a housing capable of holding the fluid having an opening in the lower end of the housing; a stylus extending through the opening in the lower end of the housing; a valve located adjacent the opening in the lower end of the housing; a valve located adjacent the opening in the lower end of the housing capable of preventing flow of the fluid to the opening in the housing and the stylus; a capillary vent having a cross-sectional area which is small compared to the mean free path of molecules of vapor of the volatile solvent; a partition interposed between the opening and the lower end of the housing and the capillary vent which forms in the housing a liquid chamber and a vapor chamber which are interconnected by an orifice in the partition sized to prevent simultaneous flow of liquid and gas; and movable means for selectively plugging the partition orifice and the capillary vent.

Claim 8

Apparatus for dispensing a fluid which includes a pigment and volatile solvent comprising: a housing capable of holding the fluid having an opening in the lower end of the housing; a stylus extending through the opening in the lower end of the housing; a valve located adjacent the opening in the lower end of the housing; a valve located adjacent the opening in the lower end of the housing capable of preventing flow of the fluid to the opening in the housing and the stylus; a capillary vent having a cross-sectional area which is small compared to the mean free path of molecules of vapor of the volatile solvent; a partition interposed between the opening and the lower end of the housing and the capillary vent which forms in the housing a liquid chamber and a vapor chamber which are interconnected by an orifice in the partition sized to prevent simultaneous flow of liquid and gas; and movable means for selectively plugging the partition orifice and the capillary vent.

Claim 9

The apparatus of claim 6 wherein the selective plugging means includes a vertically movable cap member having an upper end positioned atop the housing and having a diameter greater than the diameter of the housing, and a rod portion extending below the cap member having a lower end capable of plugging the partition orifice.

Claim 10

The apparatus of claim 7 wherein the cap member rod portion has an upper end capable of plugging the capillary vent and including means for limiting vertical movement of the cap member.

Claim 11

Apparatus for dispensing a volatile pigmented fluid comprising: a housing capable of containing the volatile pigmented fluid and having an opening in the lower end of the housing and having an enclosed cylindrical conduit in its upper end; a stylus projecting through the opening in the lower end of the housing; valve means located adjacent the opening in the housing and arranged to control fluid flow through the opening; capillary vent means including a movable rod positioned in the housing conduit and sized to provide a friction fit with the conduit and having a reduced diameter portion for providing a capillary space between the conduit and the rod; a partition interposed between the vent means and the opening in the housing having an aperture therethrough sized to prevent countercurrent flow of air and the volatile pigmented fluid; and means for controlling the flow of fluids through the capillary vent means comprising a fully diametered upper end of the movable rod.

Claim 12

Apparatus for dispensing a volatile pigmented fluid comprising: a housing capable of containing the volatile pigmented fluid and having an opening in the lower end of the housing and having an enclosed cylindrical conduit in its upper end; a stylus projecting through the opening in the lower end of the housing; valve means located adjacent the opening in the housing and arranged to control fluid flow through the opening; capillary vent means including a movable rod positioned in the housing conduit and sized to provide a friction fit with the conduit and having a reduced diameter portion for providing a capillary space between the conduit and the rod; a partition interposed between the vent means and the opening in the housing having an aperture therethrough sized to prevent countercurrent flow of air and the volatile pigmented fluid; and means for controlling the flow of fluids through the capillary vent means comprising a fully diametered upper end of the movable rod.

Claim 13

The apparatus of claim 9 including a cap means attached to the upper end of the rod and located atop the housing; including a stop member which limits vertical movement of the cap means and rod and permits the fully diametered upper end of the rod to clear the housing conduit, and wherein the rod has a lower end sized to plug the partition aperture, and wherein the lower rod end plugs the partition aperture when the upper rod end is positioned in the housing conduit.