US3420610A - Writing instruments and self-pressurizing assemblies therefor - Google Patents

Writing instruments and self-pressurizing assemblies therefor Download PDF

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Publication number
US3420610A
US3420610A US570824A US3420610DA US3420610A US 3420610 A US3420610 A US 3420610A US 570824 A US570824 A US 570824A US 3420610D A US3420610D A US 3420610DA US 3420610 A US3420610 A US 3420610A
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United States
Prior art keywords
cartridge
adapter
writing
piston
pressure
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US570824A
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English (en)
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Curtis L Malm
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Paper Mate Manufacturing Co
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Paper Mate Manufacturing Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K7/00—Ball-point pens
    • B43K7/02—Ink reservoirs; Ink cartridges

Definitions

  • a great variety of writing instruments is in use, most of them employing a cartridge which contains ink, such cartridge having a writing tip at one end and a rear end normally open to the ambient atmosphere.
  • the tips may be permanently attached to the ink reservoir portion of the cartridge or removably attached.
  • the cartridges vary in diameter, those of larger ink capacity being commonly called Jumbo.”
  • the barrels or housings may or may not include project-retract mechanisms; these mechanisms vary greatly.
  • the present invention provides a pressure control assembly which can be made separately and readily and substantially irremovably installed in any prior or desired form of cartridge for use in any prior or desired form of barrel or housing with any prior or desired form of project-retract mechanism.
  • An exemplary form of the present invention contemplates a replaceable cartridge which may be of essentially the same external dimensions as a customary Jumbo refill or replacement, which cartridge is usable in the same pen housing and with the same retracting mechanism as is the customary refill.
  • the cartridge has an ink reservoir which is normally 'vented at its rear to the atmosphere as in the case of the customary refill. Normal writing pressure on the writing tip of the cartridge depresses it a slight or nominal amount, which movement is sufficient however to close the atmospheric vent to the ink reservoir and to cause an elastic and resilient pressure element to be deformed so as to trap and compress the air in the reservoir and exert a small added pressure upon the ink in the reservoir. This permits easy free flowing and continuous writing with the pen, particularly on vertical or upside down surfaces.
  • the pressurizing mechanism is contained in the cartridge itself, which, as noted above, is of usual size and configuration for use with usual pen housings and retraction mechanisms.
  • the movement of the tip during writing is very small, on the order of 0.01" to 0.06", and normally not observed during use of the writing instrument.
  • Another object of the present invention is to provide a novel and improved writing instrument and/or cartridge of a kind which is pressurized automatically by normal writing pressure on the writing tip of the instrument, for providing increased writing capability and particularly for permitting continuous Writing on surfaces that are other than substantially horizontal.
  • a further object of the present invention is to provide a novel and improved automatically self-pressurizing writing instrument and/or cartridge which is relatively easy and economical to manufacture and assemble and which is durable and dependable in operation.
  • FIG. 1 is a longitudinal sectional view of a retractable ball point pen embodying various features of the present invention, the cartridge of the illustrated pen being shown in projecting, non-writing position;
  • FIG. 2 is an enlarged longitudinal section to reveal details of interior construction, of the upper portion of the cartridge of the pen shown in FIG. 1, said upper portion incorporating a pressure control assembly Which is shown in projecting, non-writing position;
  • FIG. 3 is a view like FIG. 2, showing the position of the control means under pressure during writing;
  • FIG. 4 is a sectional view of a modified form of pressure control assembly in a cartridge shown in non-writing position
  • FIG. 5 is a view like FIG. 4, but with the pressure control assembly shown in writing position.
  • FIGS. 1 through 3 One exemplary form of writing instrument of the present invention is shown in FIGS. 1 through 3 as a ball point pen 1.
  • the pen 1 is shown in a vertically extending position and will be described in that position as a matter of convenience, it being understood that a pen embodying the present invention may be used in other positions such as horizontally extending and even with its writing tip uppermost.
  • the illustrated pen 1 comprises a hollow housing or barrel 2 for a self-contained, automatically-pressurizing cartridge 10. While the cartridge may be permanently encased within a barrel, the illustrated barrel 2 is formed of upper and lower halves which are threadedly connected so that they can be separated to permit replacement of the cartridge.
  • the illustrated pen is of the re tractable type, of which there are a great variety.
  • the cartridge 10 is movable longitudinally of the housing 2 to an extended position as shown in FIG. 1 with a writing tip 4 at the forward end of the cartridge extending through an opening in the end of the barrel.
  • a coil retraction spring 5 disposed around the forward end of the cartridge urges it rearwardly to a retracted position (not shown).
  • FIG. 1 illustrates one exemplary form of such a mechanism, which is designated generally at 3 and which is generally as shown and described in detail in United States Letters Patent No. 2,941,510.
  • the retract-project mechanism 3 is operated by a depressible plunger 6 at the rear end of the pen to alternately and sequentially move the cartridge between the extended and retracted positions. Depressing the plunger 6 alternately supports a cam follower 7, which is in engagement with the upper end of the cartridge 10, on first a forward shoulder 8 and then a rearward shoulder 9. As shown in FIG. 1, when a forward shoulder 8 is supporting the cam follower 7, the cartridge is held in the extended Writing position against the retraction spring 5.
  • the cartridge 10 while it may be permanently installed or enclosed in the barrel, is illustrated as a replaceable cartridge which may be used to replace a used or defective prior cartridge of the same or other construction.
  • the overall size and configuration of the illustrated cartridge 10 generally 'is the same as that of thecustomary Jumbo refill, although other sizes and configurations may be used; this size and configuration is desirable in that it ordinarily permits the use of the cartridge with pens adapted to accommodate such Jumbo refills while providing more space for a pressure control assembly than would be provided in a thinner standard-size refill.
  • the cartridge may be used in non-retractable as well as retractable pens.
  • the cartridge 10 shown in FIG. 1 includes an elongated generally cylindrical tube or casing 12 which comprises a tubular reservoir of virtually uniform diameter for containing a supply of ink (FIG. 2).
  • the cartridge 10 also has a pressure control assembly or means 20 mounted at the rear end of the reservoir 12.
  • the forward end portion 14 of the reservoir 12 which is narrowed, supports the writing tip 4 at its forwardmost end in communication with the ink in the reservoir.
  • a grease follower 16 may be disposed across the reservoir 12 rearwardly of the ink supply 14 to follow the rearward end of the ink supply forwardly as the ink is used.
  • the pressure control assembly 20 may be produced separately for installation in the rearward end of a reservoir. Once it is installed, it becomes a relatively permanent or integral irremovable part of the cartridge. It operates, incident to writing pressure being applied to the writing tip, to exert a relatively low magnitude pressure force to the rear of the ink supply in the reservoir. This low pressure avoids leakage problems at the tip which could result from high cartridge pressure. It will be noted that the pressure control assembly 20 is quite compact so that it does not appreciably increase the length or width of the cartridge and does not require a large diameter barrel over that of the customary Jumbo size refill and does not require a reduction in the amount of ink held by the cartridge.
  • the assembly 20 comprises a cup-shaped adapter 22 including a generally cylindrical side wall 24, a bottom or forward. end wall 26 provided with a central port 28, and stop flange means 30 at the open end of the adapter.
  • the adapter 22 is preferably arranged for installation into the open rear end of the reservoir 12 by a press fit.
  • the adapter may be of one piece (as shown in FIGS. 4 and S), or may be of two pieces as shown in FIGS. 2 and 3, wherein it includes a generally cylindrical metal outer section 32 and an interlocked cup-shaped plastic composition inner section 34.
  • the adapter outer section 32 has its rear edge turned outwardly to form the stop flange means 30, which engages and overlies the rear edge of the reservoir 12.
  • the forward edge of the adapter outer section 32 is turned inwardly to form an annular locking flange that is received in an annular groove around the adapter inner section 34.
  • the adapter 22 forms a central pressure chamber or compartment 36 having its rearward end enlarged to provide a receptacle portion for receiving an elastic, resilient pressure element.
  • the chamber has a rearwardly directed annular retaining contact face 38 at the forward end of the receptacle portion and an annular inwardly extending sealing seat or shoulder 40 surrounding the rearward end of the receptacle portion.
  • the assembly 20 also includes a loosely fitting generally cylindrical piston 50 supported for limited relative axial movement within the open rear end of the cup-shaped adapter 22.
  • a retaining rod or stem 52 connected to the forward end of the piston 50 extends loosely through the port 28 of the adapter and limits such movement of the piston 50.
  • the piston 50 and stem 52 are provided in the exemplary embodiment of FIGS. 1 to 3 as integral parts of a movable member which also includes an integrally formed rear portion 54 having a forwardly directed annular stop shoulder 56 at the rear end of the piston 50 which can engage the flange 30 of the adapter to limit forward movement of the piston.
  • circumferentially spaced ears 58 at the forward end of the stem 52 provide means for limiting rearward movement of the piston 50.
  • Various other movement limiting means could also be used.
  • the assembly 20 also includes biasing means provided within the adapter 22 for normally biasing the piston 50 rearwardly.
  • the biasing means is provided by a coil pressure control spring 60 disposed around the stem 52.
  • the pressure control spring 60 urges the piston 50 rearwardly relative to the adapter 22 and to the reservoir 12 to the position shown in FIG. 2. If desired, other forms of springs may be used.
  • the pressure control spring 60 is stronger than the retraction spring 5 so that the depression of the plunger 6 against the cartridge 10 will compress the rertaction spring 5 without compressing the control spring 60.
  • the pressure spring may require about an 8 oz. force for its compression while the retraction spring may require only about a 6 oz. force.
  • the differential force between the retraction spring 5 and the pressure control spring is preferably between about 1 ounce and 5 ounces.
  • the pressure control assembly 20 further comprises a resilient and elastic element or means actuated by movement of the piston 50 against the biasing means 60 for expelling air from the adapter through the center port 28.
  • the resilient means is provided by a tflat circular disc or washershaped element 70 while in another embodiment (FIGS. 4 and 5), the resilient means is provided by a hollow cylindrical element 70a.
  • the washer shaped element 70 which is made of rubber or various elastomeric materials, is disposed around the upper portion of the stem 52 between the rear end of the spring 60 and the forward end of the piston 50.
  • the washer-shaped element 70- has a smaller diameter than the internal diameter of the adapter 22 to provide clearance and a passage for air.
  • the diameter of the washer-shaped element 70 is somewhat larger than that of the rear end of the receptacle portion of the pressure chamber 36 so that the element engages the seal seat 40 at the entrance to the receptacle portion and is flexed or deformed when the element is moved into the receptacle portion and contact face 38.
  • the washer-shaped element 70 is desirably quite thin, having for example a thickness of from about 0.02 to about 0.06 inch.
  • the element is preferably of moderate hardness, having for example a hardness of from about 30 to about 60 durorneters.
  • vent passage for air flow provided by the annular space between the piston 50 and the adapter 22, by the annular space between the washer-shaped element 70 and the adapter 22, by the annular opening between the lower edge of the washer-shaped element 70 and the shoulder 40 of the adapter, by the pressure chamber 36, and by the space between the lower end of the stem 52 and the port 28.
  • the operation of the ball point pen 1 may now be readily understood.
  • the plunger 6 is depressed to move the cartridge against the retract spring 5 into extended writing position as shown in FIGS. 1 and 2.
  • the pressure control spring 60 is stronger than the retract spring 5 so that the control spring 60 is not compressed at this time.
  • the cartridge 10 is locked in this extended position by the cam follower 7 abutting rearwardly against a forward shoulder 8 and the rear portion 54 of the movable element abutting the cam follower to prevent rearward movement of the piston 50.
  • the reservoir 12 and the adapter 22 are moved rearwardly relative to the restrained piston 50 and washer-shaped element 70.
  • the pressure chamber 36 and the upper end of the reservoir 12 being returned to a communication with ambient pressure. Subsequent applications of writing pressure will each impart a relatively low pressure surge or force to the rear of the ink supply so that pressure is automatically applied incident to the use of the pen.
  • the springs are designed to keep the cartridge vented both in retracted and projecting positions and to respond to a writing pressure of between 1 and 5 ounces to cause pressurization.
  • the annular shoulder or surface 56 provides means which prevent the piston 50 from moving too far forwardly into the adapter 22 to deform the elastic element 70 beyond its elastic limit.
  • FIGS. 4 and 5 show a modified form of the pressure control assembly 200:. Comparable elements are designated in general by the same number with an a sufiix.
  • the assembly 20a includes the cup-shaped metal adapter 22a, which has a cylindrical side wall 24a and forward end wall 26a with a central vent port 28a.
  • the adapter 22a is press fit into the rear open end of the reservoir 12 and the rear edge of the adapter is turned outwardly to provide a stop flange 30a which engages and rests upon the upper edge of reservoir.
  • the assembly 20a also includes a cylindrical piston 50a loosely fit in the adapter 22a for limited axial movement.
  • a stem 52a extends forwardly from the piston loosely through the port 28a and is provided with circumferentially spaced ears 58a to limit rearward movement of the piston 50a.
  • the piston 50a and the stem 52a are provided, in the exemplary embodiment of FIGS.
  • a movable member which also has a rear portion 54a having an annular forwardly facing shoulder 56a.
  • the shoulder 56a is at the rear end of the piston and is adapted to engage the stop flange 30a to limit forward movement of the piston 50a. This serves to protect the resilient elastic means from being deformed beyond its elastic limit.
  • the assembly 20a also includes biasing means in the form of a coiled pressure spring 60a disposed around the stern 52a between the piston 50a and the adapter 22 to urge the piston 50a relatively rearwardly.
  • the assembly 20a further includes an elastic, resilient deformable element or means in the form of a hollow cylindrical barrel or sleeve 70a of rubber or an elastomeric material.
  • the sleeve 70a is disposed generally coaxially within the adapter 50a and secured at its upper end around an enlarged cylindrical hub portion at the base of the stem 52a.
  • a pressure chamber 36a is defined within the deformable sleeve 70a.
  • the outer diameter of the sleeve 70a is approximately the same as that of the piston 50a, with the outer diameters of both being somewhat smaller than the inner diameter of the adapter to provide an air passage therebetween.
  • the parts are proportioned as shown in FIG. 4 so that there is also normally an air passage between the forward end of the sleeve 70a and the end wall 26a of the adapter.
  • a vent passage is provided between the flange 30a and the shoulder 56a, between the adapter side wall 24a and the piston 50a and sleeve 70a, between the adapter end wall 26a and the forward end of the sleeve, and through the port 28a around the stem 52a. This places the rear of the reservoir 12 in communication with the ambient atmosphere.
  • a pressure control assembly for the cartridge is compactly constructed and adapted to be relatively permanently assembled with an ink reservoir.
  • the reservoir may be of a usual or customary size and configuration and the compact assembly is such that, when it is mounted on the reservoir, the resultant cartridge is not appreciably longer or wider than a customary cartridge of that style; therefore, the cartridge may be utilized to replace a customary non-pressurizing cartridge.
  • the same ink capacity is also maintained.
  • the ink supply is normally vented to the atmosphere so that no partial vacuum results from repeated pressuring of the reservoir, which partial pressure could impair the ink flow to the writing tip.
  • Another advantage of the present invention is that pressure generated in the cartridge is kept relatively low; a Writing tip designed to operate at atmospheric pressure would tend to leak or gob around the ball when the cartridge pressure is high.
  • This invention takes advantage of the fact that the writing instrument is raised and lowered from the paper literally thousands of times while writing a single page, and at each application of the tip to the paper, a small pressure impulse is generated, tending to move the body of ink toward the tip.
  • the effect of a pressure impulse is not dissipated instantaneously upon raising of the writing tip (out of contact with the paper); the mode of operation utilizes the heretofore ignored elastic hysteresis, relaxation and elastic after effects of the elastomeric materials used, and although these effects are of a low order of magnitude, they assist in the attainment of the objects of this invention.
  • Another advantage of the invention is that the writing tip is moved or displaced only a slight amount when writing pressure is applied. This does not interfere with the use of the pen and is generally not perceptible to the user except as a slight give or cushioning effect when the pen tip is applied to the paper.
  • the tip movement which is the same as the relative movement of the resilient means to first close the reservoir from the atmosphere and then occupy a small portion of the pressure chamber, is kept small because it is not necessary (or desirable) to apply high pressure to the reservoir; thus, small movements provide the desired pressure surges.
  • a pressurizing control assembly for installation at the rear end of an ink reservoir of a writing instrument, comprising:
  • a hollow, cup-shaped adapter having side walls, a centrally ported bottom and stop flange means at the open end thereof, said adapter being arranged for installation into the open end of an ink reservoir;
  • a pressurizing control assembly as stated in claim 1, wherein the interior of said adapter is in communication with ambient air past said piston and with said bottom port when said piston is at the outward limit of its movement,
  • the elastic means is carried by the stern and said piston moves the elastic means into contact with said shoulder when said piston is moved against said biasing means.
  • a writing instrument having a replaceable unitary self-contained, ink-containing cartridge that is adapted to automatically apply pressure to the ink incident to use of a writing instrument, said writing instrument comprising:
  • a unitary self-contain6d pressurizing ink cartridge for a Writing instrument comprising:
  • a pressure control assembly mounted on the rearward end of said tube, said pressure control assembly including (1) a generally cup-shaped adapter that is secured in the rearward end of said tube and defines a pressure chamber having an enlarged receptacle at its rearward end, said cup-shaped adapter opening rearwardly to define an inlet to said pressure chamber in communication with the atmosphere, said inlet including a rearwardly facing annular shoulder surrounding said inlet and located at the rear of said compressor receptacle, said cup-shaped adapter having a center port at its forward end providing an outlet from said chamber to said rearward end of said tube,
  • a tubular cartridge of virtually uniform diameter having a writing tip of smaller diameter at its forward end in communication with a body of ink within the cartridge and an atmosphere in the rear end portion of the cartridge and rearwardly of said ink;
  • control assembly including:
  • a ported wall disposed within said cartridge adjacent its rear end
  • a virtually rigid member mounted for limited axial movement loosely extending through said ported wall and extending into said cartridge and having a head end extending rearwardly beyond the open end of the cartridge;
  • a spring means normally biasing the member rearwardly to place the atmosphere in the rear portion of the cartridge in communication with atmosphere ambient the cartridge, axial movement of said member against said biasing spring and with respect to the cartridge actuating the elastic element to compress the atmosphere within the cartridge.
  • the elastic resilient element is a disc Whose edge portions cooperate with said contact face to compress the atmosphere within the cartridge.
  • said pressure control assembly includes 'a pressure chamber and the elastic element is generally tubular and providing a side wall of said pressure chamber and adapted to deform radially incident to being axially compressed by the rigid member to reduce the volume of said chamber.
  • a retractable writing instrument including a rear :barrel portion carrying a manually operable projectretract mechanism, a front barrel portion having a forward opening adapted to receive the writing tip of a replaceable ink-containing cartridge, a replaceable ink-containing cartridge having a main tubular body ink reservoir portion of virtually uniform diameter provided with an open rear end and a forward extension of smaller diameter terminating in a Writing tip, and a retraction spring in the forward barrel portion normally biasing the cartridge into a retracted position against said project-retract mechanism, the provision of:
  • a pressure control assembly attached to and extending into the open rear end of the main body portion, said assembly including a cup-shaped adapter having a centrally ported bottom, an axially movable loosely fitting piston element on the adapter and extending rearwardly therefrom, said piston being provided with a stem loosely extending through the centrally ported bottom;
  • a retractable writing instrument including a rear barrel portion carrying a manually operable projectretract mechanism, a front barrel portion having a forward opening adapted to receive the writing tip of a replaceable ink-containing cartridge, a replaceable ink-containing cartridge having a main tubular body ink reservoir portion of virtually uniform diameter provided With an opening rear end and a forward extension of smaller diameter terminating in a writing tip, and a retraction spring in the forward barrel portion normally biasing the cartridge into a retracted position against said projectretract mechanism, the provision of:
  • a pressure control assembly attached to and extending into the open rear end of the main body portion, said assembly including a cup-shaped adapter having a centrally ported bottom, an axially movable loosely fitting piston element on the adapter and extending rearwardly therefrom, said piston being provided with a stem loosely extending through the centrally ported bottom;
  • stop means carried by the stem for cooperation with the bottom to limit outward axial movement of said stem and piston element
  • a writing instrument as stated in claim 11 wherein the resilient, elastic means comprise a washer of rubberlike material and the edge portion of said Washer is deformed by contact with said adapter to compress air when said piston is moved with respect to the cartridge by writing pressure upon the tip thereof.
  • a retractable writing instrument including a rear barrel portion carrying a manually operable projectretract mechanism, a front barrel portion having a forward opening adapted to receive the writing tip of a replaceable ink cartridge, and a retraction spring in the front barrel portion normally biasing the cartridge into a retracted position against said project-retract mechanism, the provision of:
  • a tubular cartridge of virtually uniform diameter having a writing tip of smaller diameter at its forward end in communication with a body of ink within the cartridge and an atmosphere in the rear end portion of the cartridge and rearwardly of said ink;
  • control assembly including;
  • a ported wall disposed within said cartridge adjacent its rear end
  • a virtually rigid member mounted for limited axial movement loosely extending through said ported wall and extending into said cartridge and having a head end extending rearwardly beyond the open end of the cartridge;
  • a spring means normally biasing the member rearwardly to place the atmosphere in the rear portion of the cartridge in communication with atmosphere ambient the cartridge, axial movement of said member against said biasing spring and with respect to 1 1 the cartridge actuating the elastic element to compress the atmosphere within the cartridge.

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  • Pens And Brushes (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US570824A 1966-08-08 1966-08-08 Writing instruments and self-pressurizing assemblies therefor Expired - Lifetime US3420610A (en)

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US57082466A 1966-08-08 1966-08-08

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US3420610A true US3420610A (en) 1969-01-07

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US570824A Expired - Lifetime US3420610A (en) 1966-08-08 1966-08-08 Writing instruments and self-pressurizing assemblies therefor

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US (1) US3420610A (de)
JP (1) JPS4832705B1 (de)
BR (1) BR6791925D0 (de)
CH (1) CH482555A (de)
DE (1) DE1561849C3 (de)
GB (1) GB1176193A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614246A (en) * 1969-11-24 1971-10-19 Gillette Co Pressurizing construction
US5628576A (en) * 1995-05-08 1997-05-13 Eversharp Pen Company Pressurized refill with double seal valve core plug and a method for pressurizing a refill
US5676481A (en) * 1991-09-26 1997-10-14 Gillette Company Marking instruments
US5738459A (en) * 1995-05-08 1998-04-14 Eversharp Pen Company "Pressurized refill with multiple seal valve core plug and a method for pressurizing a refill"
US5924810A (en) * 1997-11-05 1999-07-20 Bic Corporation Double seal system for pressurized writing device
US6075070A (en) * 1993-10-18 2000-06-13 The Gillette Company Marking instrument including liquid ink
US20030123921A1 (en) * 2000-05-15 2003-07-03 Abbas Ashraf Mahfouz Fluid applicator instrument
US7195415B1 (en) * 1999-01-18 2007-03-27 Senator Gmbh & Co Kgaa Writing instrument with variably inclinable tip
US9809722B2 (en) 2015-06-30 2017-11-07 Sanford, L.P. Transitorially erasable ink compositions and writing instruments containing same
CN110799347A (zh) * 2017-06-30 2020-02-14 株式会社百乐 加压式书写工具
US10787022B2 (en) * 2017-12-08 2020-09-29 Zebra Co., Ltd. Writing utensil with pressurizing mechanism

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT167758B (de) * 1949-02-05 1951-02-26 Alois Kosel Kugelschreiber
FR995271A (fr) * 1949-09-14 1951-11-29 Instrument à écrire, tel que stylographe ou porte-plume à réservoir
US2870742A (en) * 1956-10-19 1959-01-27 Technical Res Inc Pressure feed for cartridge type writing instrument
FR1191405A (fr) * 1958-02-10 1959-10-20 Appareil à écrire à bille à liaison élastique
US3113558A (en) * 1960-12-29 1963-12-10 Leonard L Marraffino Marking device
US3139864A (en) * 1959-02-12 1964-07-07 Henriksen Ernst Johan Jens Fountain pen structures

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT167758B (de) * 1949-02-05 1951-02-26 Alois Kosel Kugelschreiber
FR995271A (fr) * 1949-09-14 1951-11-29 Instrument à écrire, tel que stylographe ou porte-plume à réservoir
US2870742A (en) * 1956-10-19 1959-01-27 Technical Res Inc Pressure feed for cartridge type writing instrument
FR1191405A (fr) * 1958-02-10 1959-10-20 Appareil à écrire à bille à liaison élastique
US3139864A (en) * 1959-02-12 1964-07-07 Henriksen Ernst Johan Jens Fountain pen structures
US3113558A (en) * 1960-12-29 1963-12-10 Leonard L Marraffino Marking device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614246A (en) * 1969-11-24 1971-10-19 Gillette Co Pressurizing construction
US5676481A (en) * 1991-09-26 1997-10-14 Gillette Company Marking instruments
US6075070A (en) * 1993-10-18 2000-06-13 The Gillette Company Marking instrument including liquid ink
US6518329B1 (en) 1993-10-18 2003-02-11 Berol Corporation Liquid ink
US5738459A (en) * 1995-05-08 1998-04-14 Eversharp Pen Company "Pressurized refill with multiple seal valve core plug and a method for pressurizing a refill"
US5628576A (en) * 1995-05-08 1997-05-13 Eversharp Pen Company Pressurized refill with double seal valve core plug and a method for pressurizing a refill
US5924810A (en) * 1997-11-05 1999-07-20 Bic Corporation Double seal system for pressurized writing device
US7195415B1 (en) * 1999-01-18 2007-03-27 Senator Gmbh & Co Kgaa Writing instrument with variably inclinable tip
US20030123921A1 (en) * 2000-05-15 2003-07-03 Abbas Ashraf Mahfouz Fluid applicator instrument
US6986620B2 (en) * 2000-05-15 2006-01-17 Ashraf Mahfouz Abbas Fluid applicator instrument
US9809722B2 (en) 2015-06-30 2017-11-07 Sanford, L.P. Transitorially erasable ink compositions and writing instruments containing same
CN110799347A (zh) * 2017-06-30 2020-02-14 株式会社百乐 加压式书写工具
US11446953B2 (en) * 2017-06-30 2022-09-20 Kabushiki Kaisha Pilot Corporation Pressurized-type writing implement
US10787022B2 (en) * 2017-12-08 2020-09-29 Zebra Co., Ltd. Writing utensil with pressurizing mechanism

Also Published As

Publication number Publication date
DE1561849A1 (de) 1970-10-15
DE1561849C3 (de) 1974-07-25
GB1176193A (en) 1970-01-01
JPS4832705B1 (de) 1973-10-08
CH482555A (de) 1969-12-15
BR6791925D0 (pt) 1973-05-31
DE1561849B2 (de) 1974-01-03

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