US4343986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal printhead
Assignee: Hitachi Ltd
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Filing: 1981-03-19
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Granted: 1982-08-10
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Expires: 2001-03-19
Abstract
Abstract A thermal printhead comprising a substrate, heat generating thin film resistor bodies formed on the substrate and electric conductors for supplying the heat generating thin film resistor bodies with electric power, characterized in that the heat generating thin film resistor bodies are made of a Cr-Si alloy subjected to a stabilization aging heat treatment.
Inventors
- 👤 Masao Mitani
- 👤 Toyoji Tsunoda
- 👤 Tsuneyoshi Kawahito
- 👤 Tsuneaki Kamei
- 👤 Akira Yabushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:54
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/032; H10; H10N; H10N97/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A thermal printhead comprising a substrate, heat generating thin film resistor bodies formed on said substrate and electric conductors for supplying said heat generating thin film resistor bodies with electric power, characterized in that said heat generating thin film resistor bodies are made of a Cr-Si alloy subjected to a stabilization aging heat treatment.
Claim 2
Dependent Claim
54 words
A thermal printhead comprising a substrate, heat generating thin film resistor bodies formed on said substrate and electric conductors for supplying said heat generating thin film resistor bodies with electric power, characterized in that said heat generating thin film resistor bodies are made of a Cr-Si alloy subjected to a stabilization aging heat treatment.
Claim 3
Dependent Claim
30 words
A thermal printhead as claimed in claim 1, wherein said Cr-Si alloy subjected to said heat treatment consists essentially of 50 to 75 atm.% of Si and the balance Cr.
Claim 4
Dependent Claim
68 words
A thermal printhead comprising a substrate, heat generating thin film resistor bodies formed on said substrate, electric conductors for supplying said heat generating thin film resistor bodies with electric power and a wear resistant layer formed to cover said heat generating thin film resistor bodies, characterized in that said heat generating thin film resistor bodies are made of a Cr-Si alloy subjected to a stabilization aging heat treatment.
Claim 5
Dependent Claim
68 words
A thermal printhead comprising a substrate, heat generating thin film resistor bodies formed on said substrate, electric conductors for supplying said heat generating thin film resistor bodies with electric power and a wear resistant layer formed to cover said heat generating thin film resistor bodies, characterized in that said heat generating thin film resistor bodies are made of a Cr-Si alloy subjected to a stabilization aging heat treatment.
Claim 6
Dependent Claim
30 words
A thermal printhead as claimed in claim 3, wherein said Cr-Si alloy subjected to said heat treatment consists essentially of 50 to 75 atm.% of Si and the balance Cr.
Claim 7
Dependent Claim
48 words
A thermal printhead as claimed in claim 1, wherein said heat treatment is conducted for 30 to 60 minutes in the atmosphere of air, oxygen or nitrogen at a temperature which is, at the highest, 50° C. higher than the maximum normal operation temperature of said thermal printhead.
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) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |