US4517444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal printhead
Assignee: Hitachi Ltd
•
Filing: 1984-01-20
•
Granted: 1985-05-14
•
Expires: 2004-01-20
Abstract
Abstract Disclosed is a thermal printhead made of an insulating substrate, and a heat generating resistor layer formed on the substrate, and wherein the heat generating resistor layer is supplied with electric current. The heat generating resistor layer is made of Cr-Si-SiO alloy, and with the Cr, Si and SiO contents falling within a region defined by points A, B, C and D in a triangular diagram, where the points A, B, C and D are determined as follows: -Cr (mol %) (Si (mol %) SiO (mol %) -A 79.4 2.1 18.5 -B 58.6 40.9 0.5 -C 10.1 89.4 0.5 -D 24.4 3.7 71.9.
Inventors
- 👤 Tsuneyoshi Kawahito
- 👤 Katsuo Abe
- 👤 Tsuneaki Kamei
- 👤 Kazuyuki Fujimoto
- 👤 Masao Mitani
- 👤 Shigetoshi Hiratsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:18
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/335; B41J2/33505; B41J2/33515; B41J2/3355; B41J2/33555; B41J2/3357; H; H05; H05B; H05B3/00; H05B3/10; H10; H10N; H10N97/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
A thermal printhead comprising an insulating substrate, a heat generating resistor layer formed on said substrate and means for supplying said heat generating resistor layer with electric current, wherein said heat generating resistor layer is made of Cr-Si-SiO alloy, the Cr, Si and SiO contents falling within a region defined by points A, B, C and D in a triangular diagram, where said points A, B, C and D are determined as follows: ______________________________________
Cr (mol %) Si (mol %)
(SiO (mol %)
______________________________________
A 79.4 2.1 18.5
B 58.6 40.9 0.5
C 10.1 89.4 0.5
D 24.4 3.7 71.9.
______________________________________
Claim 2
Dependent Claim
101 words
A thermal printhead comprising an insulating substrate, a heat generating resistor layer formed on said substrate and means for supplying said heat generating resistor layer with electric current, wherein said heat generating resistor layer is made of Cr-Si-SiO alloy, the Cr, Si and SiO contents falling within a region defined by points A, B, C and D in a triangular diagram, where said points A, B, C and D are determined as follows: ______________________________________
Cr (mol %) Si (mol %)
(SiO (mol %)
______________________________________
A 79.4 2.1 18.5
B 58.6 40.9 0.5
C 10.1 89.4 0.5
D 24.4 3.7 71.9.
______________________________________
Claim 3
Dependent Claim
54 words
A thermal printhead according to claim 1, wherein said heat generating resistor layer has a heat generating peak temperature, and wherein said Cr-Si-SiO alloy constituting said heat generating resistor layer has been subjected to a heat treatment conducted at a temperature higher than the heat generating peak temperature of said heat generating resistor layer.
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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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |