US4770558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink writing or drawing instrument
Assignee: GEBR SCHMIDT KG FABRIK fur FEINMECHANIK FELDBERGSTRASSE 1 7742 ST GEORGEN GERMANY A CORP OF GERMANY
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Filing: 1987-02-09
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Granted: 1988-09-13
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Expires: 2007-02-09
Abstract
Abstract In an ink writing instrument, the ink storage space is divided into individual chambers that are inside the housing and are arranged axially one behind one another. The chambers are connected with the writing point by an ink guide. The ink-filled chambers are emptied one after the other by capillaries in the ink guide, air entering the chambers by a ventilation duct in the mouthpiece and the capillary ventilation openings. When ink is removed, no enclosed air volume is formed inside the storage space. In a second embodiment, the chambers are emptied simultaneously, the ventilation duct being opposite the writing point.
Inventors
- 👤 Klaus Frietsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:33
CPC Classifications
B; B43; B43K; B43K7/00; B43K7/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
An ink writing instrument having a housing with a storage chamber therein for writing fluid, axially spaced separating walls dividing said storage chamber into multiple chambers, a hollow point having a writing ball therein, ink guiding means extending from said storage chamber and into said hollow writing point for connecting the storage chamber and the writing point, said ink guiding means comprising only capillary passage means for guiding ink from said storage chamber into said writing point, a ventilating duct communicating the storage chamber with atmosphere, means consisting of capillary openings for connecting said ventilation duct to the storage chamber and for connecting the multiple chambers with each other, said separating walls being sufficiently spaced from each other so that the writing fluid is not held between them by capillary forces.
Claim 2
Dependent Claim
131 words
An ink writing instrument having a housing with a storage chamber therein for writing fluid, axially spaced separating walls dividing said storage chamber into multiple chambers, a hollow point having a writing ball therein, ink guiding means extending from said storage chamber and into said hollow writing point for connecting the storage chamber and the writing point, said ink guiding means comprising only capillary passage means for guiding ink from said storage chamber into said writing point, a ventilating duct communicating the storage chamber with atmosphere, means consisting of capillary openings for connecting said ventilation duct to the storage chamber and for connecting the multiple chambers with each other, said separating walls being sufficiently spaced from each other so that the writing fluid is not held between them by capillary forces.
Claim 3
Dependent Claim
35 words
An ink writing instrument in accordance with claim 1, said separating walls comprising ring discs, connecting webs between said ring discs, said separating walls having bores, and said ink guiding means extending through said bores.
Claim 4
Dependent Claim
63 words
An ink writing instrument in accordance with claim 1, wherein the separating wall closest to the writing point has a bore through which said ink guiding means extends, said ink guiding means forming a capillary annular passage with said bore of said separating wall, the other separating walls being without bores, and axially extending webs extending between and connected to said separating walls.
Claim 5
Dependent Claim
33 words
An ink writing instrument in accordance with claim 1, wherein the separating walls are connected in series by connecting webs, and wherein said separating walls and connecting webs comprise a one piece insert.
Claim 6
Dependent Claim
50 words
An ink writing instrument in accordance with claim 1, wherein said instrument comprises a mouthpiece, said mouthpiece comprising said ventilation duct, a ventilation chamber in said mouthpiece and communicating with said ventilation duct, said capillary openings for connecting the ventilation duct to the storage chamber being in said separating walls.
Claim 7
Dependent Claim
54 words
An ink writing instrument in accordance with claim 1, wherein said instrument comprises a rear plug for the housing, a ventilation duct in said rear plug, a ventilation chamber in said instrument adjacent to said rear plug, and at least one of said capillary openings connecting said multiple chambers being in the separating walls.
Claim 8
Dependent Claim
42 words
An ink writing instrument in accordance with claim 1, wherein said ventilation openings for said ink are provided between the housing and the edges of said chamber separating walls, and between said bores in said separating walls and the ink guiding means.
Claim 9
Dependent Claim
33 words
An ink writing instrument in accordance with claim 1, wherein said ink guiding means comprises first and second linearly extending segments in axial alignment, and means for connecting said segments to each other.
Claim 10
Dependent Claim
24 words
An ink writing instrument in accordance with claim 1, wherein said ink guiding means consists of a plastic rod having a capillary axial duct.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |