Patent US4768044A successfully refreshed from Google Patents.
US4768044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printing device
Assignee: Toshiba TEC Corp
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Filing: 1987-08-20
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Granted: 1988-08-30
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Expires: 2007-08-20
Abstract
Abstract The present invention provides a printing device wherein drying of ink in a recording electrode and resulting choking of the recording electrode can be prevented and ordinary ink can be used. The printing device includes a recording electrode which has formed at the center of the section along the entire length thereof a narrow hole for sucking and supplying ink to a front end portion of the recording electrode by a capillary phenomenon. The recording electrode further has a through-hole formed therein and communicating with the narrow hole and a rear end portion of the recording electrode so that ink may be supplied at a high speed from the narrow hole to the end portion of the recording electrode by a capillary phenomenon. Drying of ink is prevented by the fact that ink comes around in the through-hole communicating with the narrow hole.
Inventors
- 👤 Masashi Shimosato
- 👤 Shigeru Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:29
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/04; B41J2/06; B41J2002/061
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A printing device, comprising: a conductive recording electrode having formed at the center of the section along the entire length thereof a narrow hole for supplying ink to a front end portion of said recording electrode by a capillary phenomenon, said recording electrode further having a through-hole formed therein along the direction of the length thereof, said through-hole communicating with said narrow hole and a rear end portion of said recording electrode; and an opposing electrode located in an opposing relationship to said recording electrode with a record medium interposed therebetween.
Claim 2
Dependent Claim
91 words
A printing device, comprising: a conductive recording electrode having formed at the center of the section along the entire length thereof a narrow hole for supplying ink to a front end portion of said recording electrode by a capillary phenomenon, said recording electrode further having a through-hole formed therein along the direction of the length thereof, said through-hole communicating with said narrow hole and a rear end portion of said recording electrode; and an opposing electrode located in an opposing relationship to said recording electrode with a record medium interposed therebetween.
Claim 3
Dependent Claim
25 words
A printing device according to claim 1, further comprising a driving means for applying an electric field between said recording electrode and said opposing electrode.
Claim 4
Dependent Claim
18 words
A printing device according to claim 1, wherein said printing device comprises a plurality of such recording electrodes.
Claim 5
Dependent Claim
71 words
A printing device according to claim 1, wherein said recording electrode has a plurality of ribs formed so as to extend radially inwardly from an inner circumferential wall thereof toward the center of the section thereof, said narrow hole being provided by a spacing at which radially inner ends of said ribs oppose to each other while said through-hole is provided by a spacing defined by other portions of said ribs.
Claim 6
Dependent Claim
75 words
A printing device according to claim 4, wherein said ribs include four main ribs of a same profile formed in an equally spaced relationship and defining said narrow hole by the radially inward ends thereof, four smaller ribs of a same profile formed in an equally spaced relationship between said main ribs, and eight further smaller ribs of a same profile formed in an equally spaced relationship between said main ribs and said smaller ribs.
Claim 7
Dependent Claim
40 words
A printing device according to claim 5, wherein each of said main ribs, said smaller ribs and said further smaller ribs has portions of a smaller cross sectional area and portions of a greater cross sectional area formed successively therein.
Claim 8
Dependent Claim
44 words
A printing device according to claim 1, wherein each of at least said narrow hole and a portion of said through-hole adjacent said narrow hole has portions of a smaller cross sectional area and portions of a greater cross sectional area formed successively therein.
Claim 9
Dependent Claim
19 words
A printing device according to claim 1, wherein the end portion of said recording electrode has a tapered shape.
Claim 10
Dependent Claim
26 words
A printing device according to claim 1, wherein the cross sectional area of said through-hole is greater than the cross sectional area of said narrow hole.
Claim 11
Dependent Claim
46 words
A printing device according to claim 1, wherein a recording electrode formed by applying a thin metal film to a surface of a molded body which has been formed by extrusion molding using a plastics material as a molding material is used as said recording electrode.
Claim 12
Dependent Claim
37 words
A printing device according to claim 1, wherein a recording electrode formed by extrusion molding using, as a molding material, a conductive plastics material in which a conductive substance is mixed is used as said recording electrode.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |