Abstract: A method of filtering water contained in a squeezable bottle includes filling the squeezable water bottle with water; screwing a portable filtration apparatus onto the squeezable water bottle, the portable filtration apparatus includes a cap piece, the cap piece having a mouthpiece and a threaded portion, wherein the threaded portion is configured to screw onto the squeezable bottle; and a filter fluidly connected to the cap piece, wherein the filter comprises a plurality of hydrophilic hollow fibers and hydrophobic hollow fibers, the hydrophobic fibers are configured to allow air to flow into the squeezable bottle; flowing a filtrate out through the mouthpiece from the filter in response to a pressure differential between an inside portion of the squeezable bottle and an outside portion of the squeezable bottle.

Abstract: A refill of a low viscosity water-based ink ballpoint pen is provided with a housing, a pen tip attached to a front end of the housing, an ink tank (4) formed inside the housing, an ink guide member guiding ink in the ink tank (4) to the pen tip, and an air passage formed between the ink tank and the pen tip in the housing and connecting the ink tank and outside of the housing. The inside of the ink tank is divided by partition walls (11) into a plurality of ink chambers arranged in the longitudinal direction, and the ink guide member is used to guide the ink in these ink chambers from the ink chambers close to the pen tip successively to the pen tip. A substantially uniform clearance (13) is provided over the entire circumferences between the outer circumferential surface of each partition wall (11) and the inner circumferential surface of the ink tank (4). A ring-shaped ink film formed at each clearance (13) is used to hold the ink in each ink chamber.

Abstract: A dosing device for demand-dosing a liquid includes a primary container, a point of release for releasing the liquid, a main liquid channel between the primary container and the point of release and a vented secondary container, wherein the secondary container is coupled to the main liquid channel at a branch point, wherein the secondary container and the main liquid channel are designed such that the main liquid channel preferably fills with the liquid before the secondary container. The dosing device further includes a liquid valve between the primary container and the branch point, a sensor for measuring the filling level in the secondary container and finally means for opening the valve responsive to a predetermined filling level in the secondary container.

Abstract: A writing instrument has an ink storing chamber 12 formed inside a main body 10 of the writing instrument, a writing element 17 provided on a front end of the main body 10, a reservoir chamber 14 formed between the ink storing chamber 12 and the writing element 17 that communicates with the atmosphere, a partition wall 11 that divides the reservoir chamber 14 and the ink storing chamber 12 with a through hole 11a formed in a central portion of the wall, and an elongated ink supply member 20 which supplies ink inside the ink storing chamber 12 to the writing element 17, while being inserted into the through hole 11a and maintaining a predetermined gap. The ink supply member 20 is inserted into the through hole 11a, while coming into contact with an inner wall of the through hole 11a in two or more positions.

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 pen includes a reservoir tube holding a reservoir tube and a writing tip at one end for writing, a barrel fastened to one end of the reservoir tube remote from the writing tip by a connector to hold a barrel, a top cap capped on the barrel and adapted to hold a spare writing tip, a spring holder fixedly provided inside the barrel to hold a spring holder, and a movable stopper supported on a spring at the spring holder and adapted to open an air passage hole between the atmosphere and the inside space of the reservoir tube subject to the level of ink in the reservoir tube.

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: A correction pen with a pressure adjusting structure having an increased interior pressure of the pen so that the correction liquid may flow out of the pen successfully. The correction pen comprises a pen tube, a penpoint seat, and a ventilating ring. The ventilating ring is installed at an end portion of the pen tube. The lower edge thereof extends to the pen tube, and the penpoint seat is inserted into an end portion of the pen tube. The tightening portion at the lower end of the ventilating ring encloses the periphery of the penpoint seat. Thereby, a pressure adjusting structure with the ventilating ring is formed so that air flows unidirectionally, and thus a correction pen with a pressure adjusting structure is formed.

Abstract: Ink and a follower advancing with consumption of the ink are stored directly in the inside of a barrel having a pen point at its forward end. An outer tail plug constituted by a closed-end cylinder is fitted to a rear outer surface of the barrel. An air course is formed between the rear outer surface of the barrel and an inner surface of the outer tail plug to communicate with the inside of the barrel through a rear end aperture portion of the barrel. At least one air hole is provided ahead of the rear end aperture portion of the barrel to make the air course communicate with the outside air.

Abstract: A writing unit for a cartridge fountain pen comprising an ink feeder 3, a writing nib 1 mounted to the forward end portion of the ink feeder, and a gripping piece 2 enclosing the rearward end portion of the ink feeder. A capillary gap 3a extends along the longitudinal length of the rearward end portion of the ink feeder and to the writing nib, and an air channel 3c of generally triangular outline overlies the gap 3a. To compensate for an expansion of air in the writing unit caused by temperature fluctuations, a plurality of lamellar collecting chambers 3e are formed in the ink feeder along each side of the capillary gap, with each collecting chamber communicating with one of the two upper corners of the triangular air channel via an overflow capillary 3d. Also, to avoid a dripping or leakage of ink after tapping the cartridge, there is provided a fluid control valve which communicates with one of the two upper corners of the triangular air channel at a location adjacent the writing nib.

Abstract: In a writing instrument including an ink reservoir and an air hole, the air hole is spanned by a barrier formed as a porous non-absorbent ink repellent membrane of substantially uniform pore size. The barrier is non-porously sealed, for example by direct heating or ultrasonic welding, along its entire periphery to the wall of the air hole, the barrier allowing air to pass freely therethrough in both directions, but preventing escape of ink therethrough and therearound. The barrier is preferably formed of polytetrafluoroethylene with a pore radius of not more than 10 .mu.m and a thickness of not more than 200 .mu.m. The ink for use in the writing instrument preferably has a surface tension of not less than 30 mN m.sup.-1, a viscosity of not more than 10 cp and a wetting angle with the barrier of not less than 100.degree..

Abstract: Improvements in stylographic technical writing pens, particularly through a venting channel design which provides for a pressure balancing, or equalization, between an ultimate ink reservoir pressure and the total pressure at the writing tip; as writing depletes ink within the reservoir. Particularly, a venting channel, extending from the reservoir to ambient air, has the size of its cross-sectional shape vary as a function of the distance from its communication with the reservoir, with the variation calculated to offset gravitational forces attendant to a moving ink meniscus inside the vent channel. The balancing of total pressures also provides a constant ink flow through the writing tip when writing since the total pressure at the tip is maintained constant by the vent channel configuration.

Abstract: A writing implement with a sealing element on a closing cap is mountable over a writing insert having a concentric writing tip, wherein the projecting part of the writing insert is provided with abutment faces and threads on which the closing cap is screwed.

Abstract: A pen core for a writing instrument, particularly, for use in a recorder in which writing must be continuously carried out over long periods using a relatively small ink supply. The instrument has an ink conducting core for conducting ink to a writing member, and a barrel with an ink reservoir, the barrel being fitted on the outer wall of the pen core body. An annular groove in the form of a single continuous passageway is formed in the outer wall of the pen core body, the annular groove having a front end connected to an ink sucking groove, which is in turn communicated with the ink conducting core. An air passageway having a front end communicated with an air hole and a rear end communicated with the rear end of the annular groove is formed in the outer wall of the pen core body in such a manner that the air passageway does not cross the annular groove.

Abstract: A ball point pen writing instrument capable of being simply filled in aqueous ink solution and fitted with a ball point pen to be used as an ordinary writing instrument. When the ink is exhausted it can be refilled for use in the same manner as an ordinary fountain pen.

Abstract: A capillary writing pen of the type having an expansion or compensation chamber intermediate the ink reservoir and ambient air. The expansion chamber is improved such that inadvertent flowing of ink from the reservoir to the capillary pen tip due either to pressure or temperature changes is avoided. The interior wall of the expansion chamber is profiled as a contiguous series of transverse indentations which extend circumferentially about the tubular pen body to provide successive expansion areas for entrapment of air and constrictive areas where menisci of ink are formed. The forming of the menisci entraps air bubbles within the ink and, accordingly, provides increased resistance to capillary flow of ink.

Abstract: A capillary writing pen of the type having an expansion or compensation chamber intermediate the ink reservoir and ambient air. The expansion chamber is improved such that inadvertent flowing of ink reservoir to the capillary pen tip due either to pressure or temperature changes is avoided. The interior wall of the expansion chamber is profiled as a contiguous series of transverse indentations which provide successive expansion areas for entrapment of air and constrictive areas where menisci of ink are formed. The forming of the menisci entraps air bubbles within the ink and, accordingly, provides increased resistance to capillary flow of ink.