CA2011485A1 - Hydrophobic venting of free liquid ink reservoir pen - Google Patents
Hydrophobic venting of free liquid ink reservoir penInfo
- Publication number
- CA2011485A1 CA2011485A1 CA 2011485 CA2011485A CA2011485A1 CA 2011485 A1 CA2011485 A1 CA 2011485A1 CA 2011485 CA2011485 CA 2011485 CA 2011485 A CA2011485 A CA 2011485A CA 2011485 A1 CA2011485 A1 CA 2011485A1
- Authority
- CA
- Canada
- Prior art keywords
- reservoir
- pen
- ink
- vent
- hydrophobic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K8/00—Pens with writing-points other than nibs or balls
- B43K8/14—Pens with writing-points other than nibs or balls with coreless tubular writing-points
- B43K8/146—Ink cartridges, ink reservoirs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K5/00—Pens with ink reservoirs in holders, e.g. fountain-pens
- B43K5/02—Ink reservoirs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K8/00—Pens with writing-points other than nibs or balls
- B43K8/02—Pens with writing-points other than nibs or balls with writing-points comprising fibres, felt, or similar porous or capillary material
- B43K8/03—Ink reservoirs; Ink cartridges
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pens And Brushes (AREA)
Abstract
Abstract of the Disclosure A pen containing free liquid ink in which the ink reservoir is vented to atmosphere by use of hydrophobic material whereby the pen is prevented from leaking ink through capillary vents or the like while having the pressure in the reservoir equalized with ambient elf pressure by the hydrophobic venting material.
Description
'~ ~ a ~
HYDROPHOBIC VENTING OF FREE LIQUID INK RESERVOIR PEN
Bac.kg_ound of_the_Invention and_Prior Art The present invention is direrted to the field of : relatively inexpensive dlsposable ink pens which nse a self : co~talned supply ~of liquid ink. Such pen~ are of w~despread use wherever a continuous steady flow of ink is requlred and interruptlons, i.é. "skipping" in the line ;drawn by the pen! cannot be tolerated. Such applications ' :: :
, . . ...
,: ~ , . . : , :, ~ :
~:; ' ' : ~: ~ '' , : : ,, ' '' :
- . : , 2 ~
include, but are not limited to, computer driven plotter pens. The present invention is particularly concerned with a replaceable liquid ink pen useful as a plotter pen.
Prior art liquid lnk pens have a sealed reservolr of liquid ink whlch ls provided with a capillary or channel vent of small dimensions so as to prevent ink laakage through the caplllary or channel vent. These pens deliver ink to a writing media from the tip of the pen via the capillary force of the pen nib and the media. As ink supply in the reservoir is depleted, the pressure in the reservoir drops until an air bubble forms at the lnterface between the reservoir and the vent. The bubble enters the reservoir and replaces the depleted ink with air, lS momentarily relieving the pressure difference. This process occurs throughout the life of the pen;
When the pen ls not in use, its storage condltions may change. For example, the temperature of the ambient air may decrease cau~ing the re~ervoir to cool with a resultlng internal pressure drop which causes air to bubble into the reservoir. Subsequent temperature rises reverse the process and may cause movement of ink into the vent1ng channel or venting capillaries if the orientation of the pen is such that the ink in the reservoir covers the end of the venting channel or capillaries. If the ~ir expansion i9 sufficient, ink completely fills the venting channel or capillaries followed by leakage out of the pen.
The same scenario occurs with decreases in ambient pressure.
One solution to the leakage problem is to use a fibrous filler ln the liquid ink reservoir. Such fillers have an adverse effect on ink flow resulting in thin or uneven lines, particularly when the supply of ink is . , ~., :. .
: ~ . -, :. ' : . : :
~: , . - ~
2 ~
substantially depleted.
A maJor problem with using an air vent to control ink flow in free liquid lnk reservoir pens is that different inks have different viscosities, and thus different sizes of vents are necessary to obtain ldentical flow rates for each diPferent ink. One attempt to avoid this problem is dlsclosed ln U.S. Patent No. 4,588,319 issued May 13, 1986 to Niemayer, which uses a foam flow re~trictor positioned in the pen housing between the air vent and the main ink reservoir. Ink leakage to the outside of the pen through the capillary or channel vent~
due to pressure differentlals as discussed above, is not, however, provided by the foam flow restrictor.
Summarv of_the In ention It is accordingly the ob~ect of the invention to provide a substantially leakproof free liquid ink reservoir pen.
The present invention accordingly provides a free liquid ink reservoir pen comprising:
a) a reservoir containlng a supply of liquid ink;
b) a pen nlb attached to said reservoir for delivering ink from said supply thereof to a writing medium;
c) a vent for venting said reservoir to atmosphere; and d) a body of hydrophobic venting material .
:: -, :~ :'': i .
. ' -' ~ ' ; ' .
. .
' ~ ~
2 ~
arranged to prevent the flow of ink from said reservoir through said vent to atmosphere, said hydrophobic venting material permitting air flow into and out of said reservolr through said vent to compensate for pressure differentials S between the ambient atmosphere and the lpterlor of said reservoir.
Unlike capillary and channel vented pens, air flow to vent the reservoir is not restricted by bubble generation. Air ventlng of the pens disclosed herein does not regulate ink flow since the reservoir is es~entially open to atmosphere.
Br ef DescriPtion of_ he Drawing In the drawings wherein like reference numerals designate 11ke parts:
Figure 1 i~ an elevation view in cross section of 20 a first embodlment of the invention showing the pen in its vertical writing position;
Figure 2 ls a top plan view of the embodiment - shown in Fig. 1:
Figure 3 is a vlew.similar to Fig. 1. of a second embodiment of the present lnvention showing a vented bottom reservoir wall;
30Figure 4 is a vertical cross sectional view taken at lines 4 - 4 of Fig. 3;
Figure 5 is an elevation view in cross section of a third embodiment of the inventlon showing the pen in an 1nverted position; and .. . . .
- . . . . . . . .
,. . . . ~
: . : . . - : :. : : -- ~ : :
.:
,, . . .. : - ~ , :: ' ~ ' . .
- 2~418~
Figure 6 is a graph comparing the ink flow characteristics of the present invention with those of the prior art.
s Descri~tion of_the Prefe~rred Embodiment Figures 1 and 2 show an elongated pen reservoir body 2 of cylindrical configuration having a retaining collar 3 and a tapered tip portion 4 provided with a porous of hollow pen nlb 6 centrally mounted therein. The upper end of the reservoir body 2 is preferably closed by a vent cap 10 which is press fit into the upper end of the reservoir body 2 to define an ink chamber 12 therein. The reservoir body 2 is conveniently made of clear plastic material so that the color and amount of the ink therein is easlly determined.
The upper end of the reservoir body 2 has a vent in the form of one or more radlally dlstributed vent ~assageways 13 and a piece 14 of hydrophoblc venting material disposed between the ink chamber 12 and the passageways 13 therein to prevent flow of liquid ink - through the passageways 13. The hydrophobic venting material may be a generally flat sheet of material as shown or may be a plug of material or any suitable shape so long a~ it permits air to freely pass therethrough bu~ also prevents passage of ink to thereby prevent leakage of ink from the chamber 12. A presently preferred hydrophobic venting material ls a porous plastic materlal sold under the trademark GORETEX by Gore, Inc. of Elkton, Maryland.
Other materials believed suitable are porous polytetrafluoroethylene materials such as TEFLON (Trademark of Dupont Company).
' :: . .
: . ' . ~' .: : -.: ~ : ~ ~ - : -: .. . -o ~
Figures 3 and 4 show an embodiment like the embodiment of Fig. 1, but which is also provided with a vented wall 20 near the tlp portlon 4 of the pen. As ~hown, the vent wall 20 is planar and has a plurality of vent bores 22 therethrough arranged in circular pattern around the pen nib 6. An annular ring 24 of hydrophobic venting material i8 dlsposed inside the ink chamber 12 in tight engagement with the interior surface of the vent wall 20 whereby lnk in the chamber is prevented from leaking between ring 24 and end wall 20 then through the vent bores 22 which are closed by the hydrophobic material.
Regardless of the orlentation of the pen, atmospheric venting of the ink chamber through the hydrophobic material and vents at the cap end or at the vent wall end of the ink chamber takes place without leakage of the pen.
Flgure 5 shows a third embodiment of the inventio~ ~imllar to the embodiment of Fig. 1, but in which a conical plug 30 of hydrophob~c venting material extends inwardly into the iDk chamber 12 from the vent cap 10.
Figure 5 is shown in inverted non-writing position with the liquid level L of the ~nk of the filled reservoir as shown slightly below the apex 32 of the conical plug 30 of hydrophobic material. The air in th~ ink chamber 12 of the Fig. 3, embodlment is thus permitted to pass back and forth to atmosphere through conical plug 30 of hydrophobic venting material regardless of the orientation of the pen.
Flgure 6 is a graph comparing ink flow characteristics of the present invention with those of filler reservoir pens of the prior art. As seen in the graph, the amount of ink delivered to the media gradually decreases as the ink supply is exhausted in prior art filler reservo`ir pens. In comparison, the amount of ink dellvered to the paper or other m~dia remalns substantially :
",, .,~ ,,,, , , .. , .. ~ . . . :
. . ~ . .
.
- .
:: ~ ~ : .
:
2 0 1 1 4 8 ~
constant regardles~ of the amount of ink which has been used for the free liquid ink vented pens of the invention.
Persons skilled in the art will readily appreclate that varlous modifications can be made from the preferred embodiment thus the srope of protection is intended to be defined only by the limitations of the appended claims.
~:
' :
.
: , , : ,:- :
- , .
- : ~: :
,
HYDROPHOBIC VENTING OF FREE LIQUID INK RESERVOIR PEN
Bac.kg_ound of_the_Invention and_Prior Art The present invention is direrted to the field of : relatively inexpensive dlsposable ink pens which nse a self : co~talned supply ~of liquid ink. Such pen~ are of w~despread use wherever a continuous steady flow of ink is requlred and interruptlons, i.é. "skipping" in the line ;drawn by the pen! cannot be tolerated. Such applications ' :: :
, . . ...
,: ~ , . . : , :, ~ :
~:; ' ' : ~: ~ '' , : : ,, ' '' :
- . : , 2 ~
include, but are not limited to, computer driven plotter pens. The present invention is particularly concerned with a replaceable liquid ink pen useful as a plotter pen.
Prior art liquid lnk pens have a sealed reservolr of liquid ink whlch ls provided with a capillary or channel vent of small dimensions so as to prevent ink laakage through the caplllary or channel vent. These pens deliver ink to a writing media from the tip of the pen via the capillary force of the pen nib and the media. As ink supply in the reservoir is depleted, the pressure in the reservoir drops until an air bubble forms at the lnterface between the reservoir and the vent. The bubble enters the reservoir and replaces the depleted ink with air, lS momentarily relieving the pressure difference. This process occurs throughout the life of the pen;
When the pen ls not in use, its storage condltions may change. For example, the temperature of the ambient air may decrease cau~ing the re~ervoir to cool with a resultlng internal pressure drop which causes air to bubble into the reservoir. Subsequent temperature rises reverse the process and may cause movement of ink into the vent1ng channel or venting capillaries if the orientation of the pen is such that the ink in the reservoir covers the end of the venting channel or capillaries. If the ~ir expansion i9 sufficient, ink completely fills the venting channel or capillaries followed by leakage out of the pen.
The same scenario occurs with decreases in ambient pressure.
One solution to the leakage problem is to use a fibrous filler ln the liquid ink reservoir. Such fillers have an adverse effect on ink flow resulting in thin or uneven lines, particularly when the supply of ink is . , ~., :. .
: ~ . -, :. ' : . : :
~: , . - ~
2 ~
substantially depleted.
A maJor problem with using an air vent to control ink flow in free liquid lnk reservoir pens is that different inks have different viscosities, and thus different sizes of vents are necessary to obtain ldentical flow rates for each diPferent ink. One attempt to avoid this problem is dlsclosed ln U.S. Patent No. 4,588,319 issued May 13, 1986 to Niemayer, which uses a foam flow re~trictor positioned in the pen housing between the air vent and the main ink reservoir. Ink leakage to the outside of the pen through the capillary or channel vent~
due to pressure differentlals as discussed above, is not, however, provided by the foam flow restrictor.
Summarv of_the In ention It is accordingly the ob~ect of the invention to provide a substantially leakproof free liquid ink reservoir pen.
The present invention accordingly provides a free liquid ink reservoir pen comprising:
a) a reservoir containlng a supply of liquid ink;
b) a pen nlb attached to said reservoir for delivering ink from said supply thereof to a writing medium;
c) a vent for venting said reservoir to atmosphere; and d) a body of hydrophobic venting material .
:: -, :~ :'': i .
. ' -' ~ ' ; ' .
. .
' ~ ~
2 ~
arranged to prevent the flow of ink from said reservoir through said vent to atmosphere, said hydrophobic venting material permitting air flow into and out of said reservolr through said vent to compensate for pressure differentials S between the ambient atmosphere and the lpterlor of said reservoir.
Unlike capillary and channel vented pens, air flow to vent the reservoir is not restricted by bubble generation. Air ventlng of the pens disclosed herein does not regulate ink flow since the reservoir is es~entially open to atmosphere.
Br ef DescriPtion of_ he Drawing In the drawings wherein like reference numerals designate 11ke parts:
Figure 1 i~ an elevation view in cross section of 20 a first embodlment of the invention showing the pen in its vertical writing position;
Figure 2 ls a top plan view of the embodiment - shown in Fig. 1:
Figure 3 is a vlew.similar to Fig. 1. of a second embodiment of the present lnvention showing a vented bottom reservoir wall;
30Figure 4 is a vertical cross sectional view taken at lines 4 - 4 of Fig. 3;
Figure 5 is an elevation view in cross section of a third embodiment of the inventlon showing the pen in an 1nverted position; and .. . . .
- . . . . . . . .
,. . . . ~
: . : . . - : :. : : -- ~ : :
.:
,, . . .. : - ~ , :: ' ~ ' . .
- 2~418~
Figure 6 is a graph comparing the ink flow characteristics of the present invention with those of the prior art.
s Descri~tion of_the Prefe~rred Embodiment Figures 1 and 2 show an elongated pen reservoir body 2 of cylindrical configuration having a retaining collar 3 and a tapered tip portion 4 provided with a porous of hollow pen nlb 6 centrally mounted therein. The upper end of the reservoir body 2 is preferably closed by a vent cap 10 which is press fit into the upper end of the reservoir body 2 to define an ink chamber 12 therein. The reservoir body 2 is conveniently made of clear plastic material so that the color and amount of the ink therein is easlly determined.
The upper end of the reservoir body 2 has a vent in the form of one or more radlally dlstributed vent ~assageways 13 and a piece 14 of hydrophoblc venting material disposed between the ink chamber 12 and the passageways 13 therein to prevent flow of liquid ink - through the passageways 13. The hydrophobic venting material may be a generally flat sheet of material as shown or may be a plug of material or any suitable shape so long a~ it permits air to freely pass therethrough bu~ also prevents passage of ink to thereby prevent leakage of ink from the chamber 12. A presently preferred hydrophobic venting material ls a porous plastic materlal sold under the trademark GORETEX by Gore, Inc. of Elkton, Maryland.
Other materials believed suitable are porous polytetrafluoroethylene materials such as TEFLON (Trademark of Dupont Company).
' :: . .
: . ' . ~' .: : -.: ~ : ~ ~ - : -: .. . -o ~
Figures 3 and 4 show an embodiment like the embodiment of Fig. 1, but which is also provided with a vented wall 20 near the tlp portlon 4 of the pen. As ~hown, the vent wall 20 is planar and has a plurality of vent bores 22 therethrough arranged in circular pattern around the pen nib 6. An annular ring 24 of hydrophobic venting material i8 dlsposed inside the ink chamber 12 in tight engagement with the interior surface of the vent wall 20 whereby lnk in the chamber is prevented from leaking between ring 24 and end wall 20 then through the vent bores 22 which are closed by the hydrophobic material.
Regardless of the orlentation of the pen, atmospheric venting of the ink chamber through the hydrophobic material and vents at the cap end or at the vent wall end of the ink chamber takes place without leakage of the pen.
Flgure 5 shows a third embodiment of the inventio~ ~imllar to the embodiment of Fig. 1, but in which a conical plug 30 of hydrophob~c venting material extends inwardly into the iDk chamber 12 from the vent cap 10.
Figure 5 is shown in inverted non-writing position with the liquid level L of the ~nk of the filled reservoir as shown slightly below the apex 32 of the conical plug 30 of hydrophobic material. The air in th~ ink chamber 12 of the Fig. 3, embodlment is thus permitted to pass back and forth to atmosphere through conical plug 30 of hydrophobic venting material regardless of the orientation of the pen.
Flgure 6 is a graph comparing ink flow characteristics of the present invention with those of filler reservoir pens of the prior art. As seen in the graph, the amount of ink delivered to the media gradually decreases as the ink supply is exhausted in prior art filler reservo`ir pens. In comparison, the amount of ink dellvered to the paper or other m~dia remalns substantially :
",, .,~ ,,,, , , .. , .. ~ . . . :
. . ~ . .
.
- .
:: ~ ~ : .
:
2 0 1 1 4 8 ~
constant regardles~ of the amount of ink which has been used for the free liquid ink vented pens of the invention.
Persons skilled in the art will readily appreclate that varlous modifications can be made from the preferred embodiment thus the srope of protection is intended to be defined only by the limitations of the appended claims.
~:
' :
.
: , , : ,:- :
- , .
- : ~: :
,
Claims (7)
1. A free liquid ink reservoir pen comprising:
a) a reservoir containing a supply of liquid ink;
b) a pen nib attached to said reservoir for delivering ink from said supply thereof to a writing medium;
c) a vent for venting said reservoir to atmosphere; and d) a body of hydrophobic venting material arranged to prevent the flow of ink from said reservoir through said vent to atmosphere, said hydrophobic venting material permitting air flow into and out of said reservoir through said vent to compensate for pressure differentials between the ambient atmosphere and the interior of said reservoir.
a) a reservoir containing a supply of liquid ink;
b) a pen nib attached to said reservoir for delivering ink from said supply thereof to a writing medium;
c) a vent for venting said reservoir to atmosphere; and d) a body of hydrophobic venting material arranged to prevent the flow of ink from said reservoir through said vent to atmosphere, said hydrophobic venting material permitting air flow into and out of said reservoir through said vent to compensate for pressure differentials between the ambient atmosphere and the interior of said reservoir.
2. The pen of claim 1, wherein said vent is located at an area of said reservoir remote from said nib.
3. The pen of claim 2, further comprising a second reservoir vent located at an area of said reservoir proximate said nib, and a second body of said hydrophobic venting material arranged to prevent flow of ink from said reservoir through said second vent to atmosphere.
4. The pen of claim 3, wherein said reservoir has a cylindrical portion and said nib is located at one end of said cylindrical portion.
5. The pen of claim 4, wherein said second vent comprises a plurality of conduits arranged in a circular pattern around said nib and said second body of hydrophobic material is of generally annular shape.
6. The pen of claim 1, wherein said reservoir is of generally cylindrical shape and has said nib at one end thereof and said body of hydrophobic venting material comprises a cone shaped plug which has its apex extending into said reservoir to provide air venting of said reservoir in any orientation of said reservoir.
7. The pen of claim 5, wherein said reservoir is of generally cylindrical shape and has said nib at one end thereof and said first body of hydrophobic venting material comprises a cone shaped plug which has its apex extending into said reservoir to provide air venting of said reservoir in any orientation of said reservoir.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US37373589A | 1989-06-29 | 1989-06-29 | |
| US373,735 | 1989-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2011485A1 true CA2011485A1 (en) | 1990-12-29 |
Family
ID=23473654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2011485 Abandoned CA2011485A1 (en) | 1989-06-29 | 1990-03-05 | Hydrophobic venting of free liquid ink reservoir pen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0405768A1 (en) |
| JP (1) | JPH0338397A (en) |
| CA (1) | CA2011485A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11597231B2 (en) * | 2019-10-29 | 2023-03-07 | SOCIéTé BIC | Nib for writing felt pen |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19926488B4 (en) * | 1999-06-10 | 2004-05-27 | Dataprint R. Kaufmann Gmbh | Device, especially a writing instrument |
| US5600358A (en) * | 1993-06-30 | 1997-02-04 | Hewlett-Packard Company | Ink pen having a hydrophobic barrier for controlling ink leakage |
| DE4416880A1 (en) * | 1993-10-04 | 1995-07-27 | Draegerwerk Ag | Fountain pen with variable length ink reservoir |
| US6322268B1 (en) | 1993-11-12 | 2001-11-27 | Avery Dennison Corporation | Efficient fluid dispensing utensil |
| US6416242B1 (en) | 1993-11-12 | 2002-07-09 | Dataprint R. Kaufmann Gmbh | Efficient fluid dispensing utensil |
| DE19529865C2 (en) | 1995-08-14 | 2002-02-28 | Kaufmann R Dataprint | Device for applying liquids to a base by means of an application element |
| US6457892B1 (en) | 2001-04-20 | 2002-10-01 | Avery Dennison Corporation | Writing instrument having a capillary hole through the container |
| US6637965B1 (en) | 2001-06-22 | 2003-10-28 | Avery Dennison Corporation | Writing instrument having a reservoir between a tip and a capillary storage |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE232439C (en) * | ||||
| FR60745E (en) * | 1950-07-04 | 1955-01-25 | Ballpoint Pen Improvements | |
| CH329410A (en) * | 1956-07-12 | 1958-04-30 | Caran D Ache Crayons | Reservoir pen |
| CA1209093A (en) * | 1982-03-16 | 1986-08-05 | Thomas D. Hall | Writing instruments and their manufacture |
| US4588319A (en) * | 1984-10-25 | 1986-05-13 | Nicolet Instrument Corporation | Marking instrument |
| EP0210469A3 (en) * | 1985-08-02 | 1987-08-19 | Montblanc-Simplo GmbH | Ink writer |
| DE3703349A1 (en) * | 1986-04-28 | 1987-10-29 | Gore W L & Co Gmbh | INK CARTRIDGE WITH VENTILATION BODY |
-
1990
- 1990-03-05 CA CA 2011485 patent/CA2011485A1/en not_active Abandoned
- 1990-06-05 EP EP90306121A patent/EP0405768A1/en not_active Withdrawn
- 1990-06-29 JP JP2172573A patent/JPH0338397A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11597231B2 (en) * | 2019-10-29 | 2023-03-07 | SOCIéTé BIC | Nib for writing felt pen |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0338397A (en) | 1991-02-19 |
| EP0405768A1 (en) | 1991-01-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0110499B1 (en) | Ink reservoir with negative back pressure | |
| US3951555A (en) | Modular writing pen | |
| US4588319A (en) | Marking instrument | |
| US5352052A (en) | Device for applying writing, drawing, printing and painting fluids onto a surface | |
| EP0493058B1 (en) | Method and apparatus for supplying ink to an ink jet printer | |
| WO1995007191A1 (en) | Nib units for pens | |
| CA2011485A1 (en) | Hydrophobic venting of free liquid ink reservoir pen | |
| US4496258A (en) | Writing pen with space behind nib | |
| US4923317A (en) | Brushless white-out correcting fluid applicator | |
| US6457819B2 (en) | Vent for an ink-jet print cartridge | |
| US5556215A (en) | Writing instrument with overflow chamber | |
| US6416242B1 (en) | Efficient fluid dispensing utensil | |
| US6186620B1 (en) | Ink pressure control apparatus for ink-jet pens | |
| US20030038866A1 (en) | Method of regulating pressure of ink cartridge and the pressure regulating device thereof | |
| US6322269B1 (en) | Free ink system | |
| JP2688324B2 (en) | Post-fillable aqueous writing instruments and associated post-filling containers | |
| CA2042520A1 (en) | Device for depositing a writing, drawing, printing or marking fluid on a background | |
| US6572297B2 (en) | Pressure modulated free ink marker for producing variable line width | |
| US6648539B2 (en) | Free ink writing instrument with nano technology | |
| EP1437224A1 (en) | Method of regulating pressure of ink cartridge and the pressure regulating device thereof | |
| US6632041B1 (en) | Free ink system | |
| US3901608A (en) | Writing instrument | |
| US3251299A (en) | Tumbler bed stamp with cartridge ink supply | |
| EP0340046B1 (en) | Liquid container | |
| EP0976577A1 (en) | Pen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |