Patent US4878555A successfully refreshed from Google Patents.
Patent EP0586147A1 successfully refreshed from Google Patents.
US4837586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image contrast by thermal printers
Assignee: Eastman Kodak Co
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Filing: 1988-01-28
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Granted: 1989-06-06
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Expires: 2008-01-28
Abstract
Abstract A thermal paste or other thermal resistance material is placed between the ceramic substrate and heat sink of a thermal print head. By selecting the thermal resistance of the material to be sufficiently low, print contrast is improved.
Inventors
- 👤 Scott A. Brownstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:35
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/375
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A print head for a continuous tone thermal printer comprising: (a) an aluminum heat sink; (b) a ceramic substrate having first and second surfaces; (c) heaters mounted on the substrate first surface; (d) a thermal paste providing a thermal interface between the heat sink and the second surface of the ceramic substrate; and (e) the thermal paste having a thermal resistance, of less than about 0.6° C./Watt which will cause the contrast of a thermal print produced by this head to be improved by reducing both average print head temperature and lateral heat transfer between adjacent heaters.
Claim 2
Dependent Claim
97 words
A print head for a continuous tone thermal printer comprising: (a) an aluminum heat sink; (b) a ceramic substrate having first and second surfaces; (c) heaters mounted on the substrate first surface; (d) a thermal paste providing a thermal interface between the heat sink and the second surface of the ceramic substrate; and (e) the thermal paste having a thermal resistance, of less than about 0.6° C./Watt which will cause the contrast of a thermal print produced by this head to be improved by reducing both average print head temperature and lateral heat transfer between adjacent heaters.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |