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US4490731A
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Ink dispenser with "frozen" solid ink
Assignee: HP Inc
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Filing: 1982-11-22
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Granted: 1984-12-25
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Expires: 2002-11-22
Abstract
Abstract A new type of apparatus for dispensing "frozen" solid ink and the ink for use therein for printing on paper is disclosed. The ink dye vehicle is chosen to have a melting point above room temperature, so that the ink which is melted in the apparatus will not be subject to evaporation or spillage during periods of non-printing. The vehicle is also chosen to have a low critical temperature to permit the use of the solid ink in a thermal ink jet printer.
Inventors
- 👤 John L. Vaught
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:13
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/34; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175; B41J2/17593
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
An apparatus for dispensing ink which is a solid at 25° C. from a reservoir onto a recording media, said apparatus comprising: a feed tube having an entrance in contact with the ink in the reservoir; a nozzle coupled to the feed tube; and a resistance heater for melting the ink, said resistance heater extending from the reservoir through the feed tube to the nozzle.
Claim 2
Independent Claim
65 words
An apparatus for dispensing ink which is a solid at 25° C. from a reservoir onto a recording media, said apparatus comprising: a feed tube having an entrance in contact with the ink in the reservoir; a nozzle coupled to the feed tube; and a resistance heater for melting the ink, said resistance heater extending from the reservoir through the feed tube to the nozzle.
Claim 3
Dependent Claim
36 words
An apparatus for dispensing ink as in claim 1 wherein the resistance heater is positioned so as to melt only the solid ink in the reservoir in immediate proximity with the entrance of the feed tube.
Claim 4
Dependent Claim
34 words
An apparatus for dispensing ink as in claim 1 further comprising: a jet resistor in proximity with the nozzle whereby the melted ink is forced out of the nozzle as a jet of droplets.
Claim 5
Dependent Claim
33 words
An apparatus for dispensing ink as in claim 3 wherein electric current is continuously applied to the ink jet resistor so that the ink in the nozzle is maintained in a liquid state.
Claim 6
Dependent Claim
94 words
An ink for writing on paper with a non-impact printer having expulsion means for expelling said ink from an orifice, said ink consisting essentially of: a dye; and a vehicle which is a solid at 25° C. consisting of solvent for said dye, said solvent having a high vapor pressure, a melting point greater than 25° C., and a critical temperature less than the degradation temperature of said expulsion means, and a binder with a low vapor pressure for binding said dye to said paper when said solvent has sublimed off of the paper.
Claim 7
Dependent Claim
94 words
An ink for writing on paper with a non-impact printer having expulsion means for expelling said ink from an orifice, said ink consisting essentially of: a dye; and a vehicle which is a solid at 25° C. consisting of solvent for said dye, said solvent having a high vapor pressure, a melting point greater than 25° C., and a critical temperature less than the degradation temperature of said expulsion means, and a binder with a low vapor pressure for binding said dye to said paper when said solvent has sublimed off of the paper.
Claim 8
Dependent Claim
14 words
An ink as in claim 5 wherein said solvent consists essentially of neopentyl alcohol.
Claim 9
Dependent Claim
18 words
An ink as in claim 6 wherein said binder consists essentially of a varnish soluable in said solvent.
Claim 10
Dependent Claim
13 words
An ink as in claim 5 wherein said solvent consists essentially of difluorotetrachlorenthane.
Claim 11
Dependent Claim
18 words
An ink as in claim 8 wherein said binder consists essentially of a varnish soluable in said solvent.
Claim 12
Dependent Claim
18 words
an ink as in claim 5 wherein said binder consists essentially of a varnish soluable in said solvent.
References Cited (Backward Citations)
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |