Abstract: A writing implement includes a cylindrical shaft member, a pen tip member which is fixed to one end of the shaft member and from which colored ink seeps out, liquid for ink which is stored in the shaft member and which comprises a part of the colored ink seeping out from the end of the pen tip member, and colorant to be added to the above described liquid for ink to be the colored ink. Moreover, at least a part of a cylindrical side surface of the shaft member corresponding to the storing part of the liquid for ink is formed to be transparent. Between the liquid for ink and the colorant-storing part storing the colorant is provided a colorant-adsorbing core which introduces the liquid for ink into the colorant-storing part while capturing the colorant diffusing toward the storing part of the liquid for ink.

Abstract: A writing assembly is provided. The writing assembly includes a writing instrument having a first end with a marking point depending therefrom and a second, opposite end, and a cap having a first end with a receptacle defined therein and a second end, the first end of the writing instrument disposed into the receptacle of the cap in a first, storage state and the second end of the writing instrument disposed into the receptacle of the cap in a second, operational state. The writing assembly also includes an eraser assembly including a carrier and an eraser material attached to the carrier, the carrier attached to the second end of the cap.

Abstract: A highlighting device is disclosed. The device has a body having a reservoir for a quantity of ink and at the first end an applicator tip. The applicator tip has a face for applying ink to a surface. The face is generally rectangular and has a length and a width. The ratio of the length of the face to the width of the face being at least 1:3.

Abstract: A free ink marking instrument for dispensing an ink, including a housing, a reservoir for storing ink within the housing, a feed tube to convey ink communicating with the reservoir, a tip disposed within the feed tube for conveying ink to a substrate at a marking end of the tip, a porous buffer disposed within the housing adjacent the feed tube and configured for storing ink during periods of a decreasing pressure differential between the reservoir and the atmosphere, and bubble separation area in the form of either a hole in the feed tube or a hole or passage formed between the feed tube and the tip, is disclosed.

Abstract: In a free-ink type collector writing instrument, a collector (5) is formed with a passage hole (10) for providing commutation between the interior and the outside air so as to prevent the point assembly from being affected by the variation in inner pressure upon freezing or upon increase or decrease in pressure. At the same time, the passage hole is constructed in a shape so as not to present a stronger capillary attraction than that of an air/liquid exchanger (9) and than that of an ink feeder portion (3,6), whereby the problem of exudation leakage over time can be prevented.

Abstract: A wet writing implement comprises a shaft (30) for holding a capillary writing tip (32) and a closure cap (10) which can be reversibly fitted on to the shaft (30) for protecting the writing tip (32). Arranged in the closure cap (10) is a writing fluid storage device (12) for receiving a writing fluid.

Abstract: A direct-feed ballpoint writing implement includes a barrel internally provided with an ink tank, a grooved member placed in a front part of the barrel and provided with a groove for guiding air and ink, an ink feed member pressed in the grooved member, a barrel tip fixedly joined to a front end part of the grooved member, a ball holder inserted in the barrel tip and put on a front end part of the ink feed member, and a ball held in a front end part of the ball holder. A compression spring may be extended at least between the ink feed member and the ball in the ball holder.

Abstract: A marking pen having an excellent cap-off performance which comprises at least a colorant, a solvent and a resin and, if necessary, an erasability-providing agent as ink components and in which a pen tip comprising a fibrous feed or a plastic feed is coated with a coating agent comprising a substance providing a cap-off property, wherein the above coating agent comprises petroleum waxes comprising hydrocarbons having side chains as a principal component (50% by weight or more). Preferably, the above petroleum waxes comprising hydrocarbons having side chains as a principal component have a melting point of 63° C. or lower and are solid at room temperature.

Abstract: A writing implement having a feeder core for feeding ink in an ink tank to a pen tip and an ink collector in which a plurality of comb-tooth like elements formed with an air-liquid exchange groove are arranged at intervals in a feeder core axial direction. An ink holding plate is provided so as to face a rear end face of the ink collector in such a manner as to form a gap for holding the ink in the ink tank by way of the capillary phenomenon between the ink holding plate an the rear end face. A plurality of air exchange grooves in which ink flows and is discharged in an amount responding to a change in pressure in the ink tank into and from grooves between the comb-tooth like elements which are formed between an outer edge portion of the comb-tooth like element and a feeder core contact.

Abstract: A free ink marking instrument for dispensing an ink, including a housing, a reservoir for storing ink within the housing, a feed tube to convey ink communicating with the reservoir, a tip disposed within the feed tube for conveying ink to a substrate at a marking end of the tip, a porous buffer disposed within the housing adjacent the feed tube and configured for storing ink during periods of a decreasing pressure differential between the reservoir and the atmosphere, and bubble separation area in the form of either a hole in the feed tube or a hole or passage formed between the feed tube and the tip, is disclosed.

Abstract: A unit (1) for packaging and applying a liquid product (P) includes a reservoir (2) containing the product and having a neck (4), a free edge which defines an opening (8); a removable part (5) for closing off the opening in a leaktight manner; and an applicator (10) in the form of at least one block (12) of foam with open or semi-open cells capable of being loaded with product by pumping and fitted inside the neck. The applicator includes a first end (13) in permanent liquid communication with the product inside the reservoir and a second end (14) opposite the first end (13), the second end (14) forming an application surface (15) which is movable axially between a first position in which the application surface (15) emerges outside the neck (4) through the opening (8) in order to apply the product, and a second position in which the application surface (15) is contained in a leaktight manner inside the reservoir (2).

Abstract: Provided is a writing instrument in which a pen tip comprising a fibrous feed or a plastic feed is coated with a coating agent comprising a substance providing a cap-off property, wherein a fluorine base surfactant and/or a silicone base surfactant are added to an ink for the above writing instrument, and/or a substance which is solid at room temperature and has a solubility of 5% or less in an ink solvent at room temperature and which has a polar functional group is added to the coating agent, whereby the writing instrument having an excellent cap-off performance can be obtained.

Abstract: A flask for medicinal preparations comprises an elastic receptacle (1) with an orifice in the form of a neck (2), a porous plug-rod (3) arranged inside the receptacle and having one end extending out of the receptacle, and a sealing cap (7) placed above the neck of the receptacle. The elastic receptacle (1) is provided with a head piece (5) having an orifice of size not exceeding a cross-sectional area of the porous rod. A part of the porous rod disposed inside the receptacle has a cross-sectional area larger than the passage area of the receptacle neck orifice. The porous rod (3) is provided with axial notches (9) located on opposite sides of the rod. The porous rod (3) can be of circular or rectangular or polygonal cross-section. The flask is equipped additionally with a rigid body (8) embracing the elastic receptacle and mounted on the head piece (5) of the receptacle by means of a releasable connection. In addition, a spring clip (10) mounted on the outer surface of the sealing cap is provided.

Abstract: Disclosed is a writing implement capable of preventing ink from being excessively dispensed in response to change of temperature or pressure in a reservoir, or an outer impact. The writing implement according to the one embodiment of the present invention includes a housing, a reservoir for storing ink within the housing, an ink supplying pipe for guiding flow of the ink, an ink feeder for absorbing and storing the ink moving through the ink supplying pipe from the reservoir to control a current rate of the ink, a buffer for temporally storing the ink during reducing pressure differential between the reservoir and atmosphere, and a tip for conveying the ink from the ink feeder to a substrate. In the writing implement as constructed above, even though the ink excessively moves to the tip with expansion in response to change of temperature or pressure in the reservoir, the ink feeder and buffer temporarily stores a part of the ink, resulting in regularly supplying the ink to the tip.

Abstract: A writing implement is provided and includes a pen element that feeds and retain ink from a writing implement body. The pen element has an ink leader, a writing part delivering ink from the ink leader portion and a viewer portion directly above with respect to the axial direction of the writing part allowing observation of the view in the writing direction. The present writing implement therefore allows easy observation of the view on the opposite side of the pen element as the pen point and allows the end point of the drawn line to be readily distinguished.

Abstract: Provided is an ink introducing tube which realizes a stabilized ink supply from an ink tank located at the rear portion of a felt pen into a tip at the front end thereof, and a writing instrument incorporating it. On the inner peripheral wall of an ink introducing tube through which an ink tank is communicated with a tip located at the front end, a plurality of protrusions are formed to provide therebetween a passage for downward flow which utilizes the capillary action of the protrusions, and the interior space of the ink introducing tube which is surrounded by the tips of the plural protrusions is formed as a large space so that the capillary action can take place. Thus, the flow of air to the ink tank moves upwardly through the interior space while changing into air foam during the ascent, whereas the ink flows downward while being retained between the protrusions. Therefore, replacement of the ink by the air can be performed smoothly whereby ink blobbing is prevented and flawless writing is realized.

Abstract: A writing instrument has a housing containing an ink reservoir. The writing instrument further has a writing nib in communication with one (or both) end of the ink reservoir by an ink induction device. In connection with the ink reservoir, there is also at least one set of pressure balance system. The pressure balance system includes a nano hydrophobic venting material that allows air to flow in and out of the reservoir to compensate pressure differential between ambient atmosphere and the interior of the ink reservoir, while prevents ink to flow from the ink reservoir to the atmosphere.

Abstract: The invention concerns a writing implement (1) comprising ink (5) in a fibrous or non-fibrous reservoir, a retarding agent soluble or dispersible in the ink and a nib (7) for transferring ink (5) from the reservoir to the writing medium and a method for making such a nib (7). The invention is characterised in that a retarding agent is included in the writing nib (7) and is adapted to be carried by the ink (5) when it is transferred into said nib (7). The inventive method consists in impregnating an already machined writing nib with a solution containing a specific amount of a retarding agent, drying the impregnated writing nib, without stirring, by heating at a temperature less than 60° C.

Abstract: An applicator for a fabric treatment to effect mechanical stain removal has a no rinse fabric treatment composition and an application device. The application device induces a certain frictional stress upon the fabric and has a frictional stress value on the fabric optimally chosen to effect fabric treatment and is at the same time kind to the fabric. Advantageously, the application device has a frictional stress value of from 0.05 N mm−2 to 1 N mm−2. The frictional stress should be high enough to ensure good mechanical stain removal, good delivery of the fabric treatment composition into the fabric and allow fabric treatment with fabric friendly chemical compositions at low levels.

Abstract: A liquid applicator device comprising an applicator liquid container and a liquid dispensing mechanism. The device has a valve element movable disposed between an open position and a closed position for controlling the flow of the applicator liquid from the container. The liquid dispensing mechanism has a hollow cylindrical portion for supporting an applicator tip. The inner end of the applicator tip communicates with the valve element. An axial displacement of the applicator tip moves the valve element into the open position for enabling the applicator liquid to migrate through the applicator tip for applying the liquid to a surface. The improvement comprises a recess cooperating with a retainer for preventing the removal of the applicator tip from the liquid applicator device.

Abstract: A capillary wick running through the reservoir so that at least a portion of the capillary wick along the longitudinal axis is in direct contact with the liquid within the reservoir. This allows liquid in the reservoir to convey to a tip with minimal flow resistance. As such, a sufficient amount of liquid is provided to the tip, even when the writing instrument is used in quick strokes or for a long duration of time. In a writing position, a capillary storage is above the reservoir so that the capillary storage remains substantially dry without the head pressure affecting the capillary storage. The present invention is also directed to providing a porous divider wall between a reservoir that is below the storage, but without a capillary wick. Here, the porous divider wall is used to regulate air flow into the reservoir. Without the capillary wick, the unit costs and the manufacturing costs are substantially reduced.

Abstract: Melt blown bicomponent fibers comprising a sheath of polyethylene terephthalate or a copolymer thereof and a core of nylon 6,6 and a reservoir or a nib in a writing or marking instrument comprising a porous element formed from such fibers bonded to each other at spaced points of contact. For use as a nib the core polymer may also be polybutylene terephthalate.

Abstract: A free ink marking instrument for dispensing a fluid is disclosed. The instrument includes a feeder, a passage of reduced capillarity surrounding the feeder for conveying at least one of fluid and air to the reservoir during an increasing pressure differential between air in the reservoir and the atmosphere, a porous buffer configured for storing ink during periods of a decreasing pressure differential between air in the reservoir and the atmosphere, and a divider tube separating the buffer and the passage along a majority of the length of the buffer. The fluid and air may enter the feeder through a minor surrounding portion of the buffer during the period of the increasing pressure differential. An ink and air conveyor for use in a free ink marking instrument is also disclosed. A method for compensating for changes in ambient temperature and pressure in a free ink marking instrument is also disclosed.

Abstract: A tool designed to efficiently apply sealant to tile grout—it is a plastic, round bottle (4), with ounce indicator lines marked on the exterior (8); and a plastic nozzle (10) that tightly screws onto the bottle, via embedded threads inside the top of the bottle (16) and inside the base of the nozzle (18). Cellulose sponge (6 and 12) is fitted tightly inside the bottle (4) is fitted tightly inside the bottle (4) and nozzle (10); which controls the amount of sealant flow so that there is minimal dripping or waste of sealant. The applicator holds approximately 5 to 6 ounces of liquid grout sealant. The tip of the nozzle is marked (14) and gradated (14) so it can be cut with a razor to match the flow of sealant to the width of the grout. The application of sealant is controlled by gently applying pressure to the flexible bottle (4) and moving the tip at a 45 degree angle along the line of grout to be sealed.

Abstract: In a writing instrument with a collector of the present invention, an ink absorber made up of a fabric sliver etc., capable of keeping ink therein is disposed inside the ink tank and is connected to the center core, longitudinal groove or the like as an ink feeder portion. The ink absorber is adapted to have a length at least reaching to a position more rearwards than the approximate center of the ink tank and has an outside diameter that is sized to be smaller than the inside diameter of the ink tank so as to create a space around itself for permitting free-state ink to move freely while the collector has a lead portion for establishing connection enabling ink to be led from the ink absorber to the air/liquid exchanger. Specifically, the lead portion of the collector may be configured of a projecting portion directly inserted into and connected with the ink absorber and a lead channel formed on the projecting portion.

Abstract: A liquid applicator having a predetermined applying part (3) at the front end of a cylindrical main part (2), wherein a liquid squeezing mechanism (4) attached to the main part (2) is caused to push an application liquid (L) having a viscosity of 500 mPa.s or lower stored in the main part (2), forwards so as to feed applying part (3), is constructed so that an application liquid feeder (3c) also serving as a liquid leakage preventing structure is arranged between the applying part (3) and the main part (2).

Abstract: A writing instrument of the present invention has an ink chamber 2 formed inside a main body 1 of the writing instrument, a writing element 5 provided on a front end portion of the main body 1 of the writing instrument, a reservoir chamber 10 which is formed between the ink chamber 2 and the writing element 5 and communicates with the atmosphere and with the writing element 5, a plurality of walls 14 and 14a which partitions the reservoir chamber 10 and the ink chamber 2 and further partitions the ink chamber 10 into a plurality of small chambers in the axis direction, and an ink supply member 16 which penetrates the plurality of walls and supplies ink from the ink chamber 2 to the writing element 5, where each of the walls is provided with a communication hole 15 capable of holding the ink by capillary force, and these communication holes are sealed with an ink membrane.

Abstract: A writing instrument equipped with an exchangeable inner pen filled with an ink containing a solvent having a vapor pressure of 1 to 50 mm Hg (20° C.) in a writing instrument main body which is a barrel part, wherein the inner pen described above has a pen tip comprising a fiber feeder or a plastic feeder, and the above pen tip is coated with a substance having a vaporization-inhibiting action in an amount of 0.01 to 20% by weight in terms of a weight ratio based on the pen tip. It is more effective to further add a substance having a vaporization-inhibiting action to the ink. The substance having a vaporization-inhibiting action includes glycerin derivatives, polyoxyethylenesorbit fatty acid esters, alkyl phosphates, waxes and lecithin.

Abstract: An ink including an aqueous dispersion of a metallic pigment and a film-forming resin, optionally together with one or more of a pH-adjusting agent, a color agent, a linking agent, an anti-settling agent, and a preservative, is disclosed. A marking instrument, particularly suitable for use with an ink according to the invention, and including a low-density reservoir for storing ink joined in capillary coupling relation to a porous nib, is also disclosed.

Abstract: This invention relates to an instrument, preferably a marking instrument, for applying a fluid to a surface and particularly, though not exclusively, to a writing pen, including a marker pen, or a brush, especially an artist's brush. Other types of brushes are contemplated, such as those for applying cleaner, mouthwash or perfume to teeth. The instrument (2) comprises a tip (6), a holder for the tip (4), a cartridge (14) containing the fluid mounted within or connectable to the holder (4), and a manually-operable spray pump arrangement (10) for repeatedly dispensing a predetermined amount of the fluid under pressure from the cartridge (14) to the tip (4) of the instrument (2). A disposable or re-fillable cartridge for the instrument is also described.

Abstract: An applicator comprising:

Abstract: A permanent ink marker for re-identifying insulated wire. The marker has a container for ink, and a nib that is disposed on the container and in communication with the interior thereof. The nib is provided with a slit that extends from an end of the nib that is remote from the container in a direction toward the container. The end of the slit remote from the end of the nib is preferably widened, and can have a circular cross-section. The end of the nib preferably has a notch where the slit starts.

Abstract: The invention concerns a writing implement (1) comprising ink (5) in a fibrous or non-fibrous reservoir, a retarding agent soluble or dispersible in the ink and a nib (7) for transferring ink (5) from the reservoir to the writing medium and a method for making such a nib (7). The invention is characterised in that a retarding agent is included in the writing nib (7) and is adapted to be carried by the ink (5) when it is transferred into said nib (7). The inventive method consists in impregnating an already machined writing nib with a solution containing a specific amount of a retarding agent, drying the impregnated writing nib, without stirring, by heating at a temperature less than 60° C.

Abstract: To provide a direct liquid type writing instrument capable of being used without running-over of ink even in an environment in which an internal pressure is higher than an external pressure. There are included an ink reservoir containing ink, a junction core extending on a center axis, and a pen body provided integrally on a tip end side of the junction core. The ink reservoir includes a main ink reservoir, a pen core chamber in which the junction core is disposed, and a sub ink reservoir which is provided between the main ink reservoir and the pen core chamber and communicates with the main ink reservoir via a small hole. Between the sub ink reservoir and the pen core chamber, an opening/closing valve is provided to normally isolate the pen core chamber from the sub ink reservoir and to be operated so that the pen core chamber communicates with the sub ink reservoir when the pen body is operated.

Abstract: An ink composition or system for writing instruments constructed with a polyester fiber reservoir and a porous oriented fiber nib. This ink system will write on both black and white surfaces. On black surfaces, it will reveal itself as being opaque and metallic almost iridescent in appearance. On white surfaces, a tint of color is observed with distinct flecks of silver. The ink system is composted of water as a carrier, a permanent water-based binder, a colored pigmented permanent water-based dispersion of sub-micron particle size, a unique aluminum dispersion of specific particle size in a special carrier, a humectant, a surfactant that lowers surface tension, an anti-settling additive, a preservative and a base acting as a pH adjuster.

Abstract: Apparatuses using gel ink to create images, particularly, generally pen shaped stampers and markers, wherein gel ink of various types are used. The gel ink travels from an ink tip through an ink conduit to saturate the applicator. The ink tip forms the top end of the ink conduit and the applicator forms the bottom end of the ink conduit. All three components are made of a porous material that will absorb the gel ink. The apparatus using gel ink for creating images can then be used to stamp or to draw on a surface.

Abstract: A writing instrument of the present invention has an ink chamber 2 formed inside a main body 1 of the writing instrument, a writing element 5 provided on a front end portion of the main body 1 of the writing instrument, a reservoir chamber 10 which is formed between the ink chamber 2 and the writing element 5 and communicates with the atmosphere and with the writing element 5, a plurality of walls 14 and 14a which partitions the reservoir chamber 10 and the ink chamber 2 and further partitions the ink chamber 10 into a plurality of small chambers in the axis direction, and an ink supply member 16 which penetrates the plurality of walls and supplies ink from the ink chamber 2 to the writing element 5, where each of the walls is provided with a communication hole 15 capable of holding the ink by capillary force, and these communication holes are sealed with an ink membrane.

Abstract: A dispenser for dispensing shaving liquids/gels. The dispenser has a tubular member and a closure member. The closure member is fitted above the tubular member with the help of threaded grooves. The tubular member of the dispenser has indentations to provide a firm grip of the dispenser especially when used in bath or shower. In order to dispense the liquid, openings are formed on the tubular member and the closure member. The closure member can be rotated from a use position, where the openings are aligned with each other, to a non-use position where the openings are opposite each other. A nylon mesh sponge is attached to the closure member to aerate and foam the liquid and to avoid wetting of hands while the shaving liquid/gel is being applied to the affected area of skin.

Abstract: The object is to provide a writing instrument in which a large-diametric ink retaining portion with narrow grooves in width and still capable of securing a large enough air channel can be formed so that the replacement of the sufficient amount of air can be effected between the ink retaining portion and the outside air. To achieve this, in an ink retaining portion (12), a plurality of cutouts (32) are formed so that each cutout (32) is formed to a right angle direction with respect to a center line (16a) of the sheet element (16) with a length equal to or greater than half the radius (R) (A≧(R/2), B≧(R/2)) and that one end of the cutout (32) is extended to the periphery.

Abstract: An applicator (1) is provided, such that an end closure or a proximal plug (3) fitted in a cylindrical body (2) of the applicator can be removed easily without use of a coin or the like tool. Repeated easy operations for attaching and detaching the plug will not impair firm engagement of the plug with the body, protecting the plug from inadvertently slipping off.

Abstract: The present invention relates to an applicator for a fabric treatment composition and its application. More specifically the invention relates to a versatile, effective convenient to apply fabric treatment applicator. Claimed and described is an applicator for a fabric treatment composition, which does not require rinsing, comprising an application device, which induces a certain frictional stress upon fabric.

Abstract: A free-ink type writing instrument having a temporary ink collector having a sectionally combed configuration, between an ink tank chamber and an writing tip and inside the front barrel, wherein all or part of the gaps between neighboring combed teeth for retaining ink in the temporary ink collector are set equal to 0.15 mm or smaller, and the ink tank is charged with an ink having a surface tension equal to 30 mN/m or lower at 25° C.

Abstract: A non-erasable liquid ink for a marking instrument including a colorant and a solvent and having a water content of about 0-15% by weight and a viscosity of about 15 to 4,500 cps. Also disclosed is a marking instrument filled with an ink of such a viscosity or lower in its reservoir.

Abstract: A marking pen has a hollow shank 10 that supports an applicator 11 having a marking face 12. The applicator part 16 extends through a channel formed by a seal 14 into and sealingly connected to a liquid ink reservoir 13. Small air vent passages 17 and 18 provided around the applicator part 15 lead to a buffer zone 20 partially filled with porous material 21. Air may pass during use of the pen into the buffer zone but liquid ink will not flow along the passages and out of the pen. The configuration enables free liquid ink to be stored in the reservoir inside the shank.

Abstract: A device for applying a fluid, notably a writing pen or cosmetic pencil, includes a tubular shaft, a fluid container that is positioned therein, a tip, and a conducting system for the fluid. The container ensures constant pressure equalization with the atmosphere by having its front and rear ends each being fluidically connected to the atmosphere. At the rear end of the container a ventilation opening is positioned. The ventilation opening opens into the container interior containing the fluid and is sealed by a semi-permeable membrane.

Abstract: An ink composition or system for writing instruments constructed with a polyester fiber reservoir and a porous oriented fiber nib. This ink system will write on both black and white surfaces. On black surfaces, it will reveal itself as being opaque and metallic almost iridescent in appearance. On white surfaces, a tint of color is observed with distinct flecks of silver. The ink system is composted of water as a carrier, a permanent water-based binder, a colored pigmented permanent water-based dispersion of sub-micron particle size, a unique aluminum dispersion of specific particle size in a special carrier, a humectant, a surfactant that lowers surface tension, an anti-settling additive, a preservative and a base acting as a pH adjuster.

Abstract: A liquid applicator implement includes a container for freely movable liquid (6), a capillary storage (16) for temporarily receiving liquid upon a change in air pressure and/or temperature of the environment, an applicator element (12) and a capillary air inlet for compensation in respect of liquid taken from the container. A passage (20) for conveying the liquid entirely or partially bridges over the distance between the container with the liquid (6) and the applicator element (12). The passage is not directly in communication with the storage (16) and it is of lower capillarity than the storage (16).

Abstract: A liquid marker system utilizes three primary components to permit marking of lines of various widths from a single nib. The three components are a porous nib, a transfer wick and a squeezable container. Operation relies on different squeeze pressures applied to the housing to produce different line widths from the single nib as the nib is moved across a marked surface. The porous wick provides a resistance to flow until the bottle is squeezed and then supplies a minimum of capillary flow to the nib. The user squeezes the container to overcome the resistance of the wick. No venting of the container interior is required because the wick and nib system allows the passage of air into the container when the container is returned to its unstressed (i.e., un-squeezed) condition.

Abstract: A writing instrument has a housing containing an ink reservoir. The writing instrument further has a writing nib in communication with one (or both) end of the ink reservoir by an ink induction device. In connection with the ink reservoir, there is also at least one set of pressure balance system. The pressure balance system includes a nano hydrophobic venting material that allows air to flow in and out of the reservoir to compensate pressure differential between ambient atmosphere and the interior of the ink reservoir, while prevents ink to flow from the ink reservoir to the atmosphere.

Abstract: A free ink marking instrument for dispensing an ink, including a housing, a reservoir for storing ink within the housing, a feed tube to convey ink communicating with the reservoir, a tip disposed within the feed tube for conveying ink to a substrate at a marking end of the tip, a porous buffer disposed within the housing adjacent the feed tube and configured for storing ink during periods of a decreasing pressure differential between the reservoir and the atmosphere, and bubble separation area in the form of either a hole in the feed tube or a hole or passage formed between the feed tube and the tip, is disclosed.