US4423425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal print head having glazed metal substrate
Assignee: International Business Machines Corp
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Filing: 1982-02-01
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Granted: 1983-12-27
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Expires: 2002-02-01
Abstract
Abstract A porcelain glazed metal bar has a rounded edge carrying a line of deposited print elements. Conductive lands deposited on both sides of the glazed bar connect the print elements to contacts for external circuitry.
Inventors
- 👤 Dennis L. Reese
- 👤 John L. Regehr
- 👤 Albert E. Schierhorst
- 👤 Ronald L. Soderstrom
- 👤 James M. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:58
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/345
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
A thermal print head, comprising: a substantially planar metal substrate having a rounded edge; an insulating glaze on said substrate; a plurality of thermal print elements disposed on said rounded edge; and a plurality of conductive lands on said substrate and contacting each of said print elements.
Claim 2
Dependent Claim
47 words
A thermal print head, comprising: a substantially planar metal substrate having a rounded edge; an insulating glaze on said substrate; a plurality of thermal print elements disposed on said rounded edge; and a plurality of conductive lands on said substrate and contacting each of said print elements.
Claim 3
Dependent Claim
62 words
The thermal print head of claim 1, wherein said substrate has two substantially flat surfaces, each of said surfaces carrying a subset of said lands connected to respective ones of a subset of said print elements, a common land connected to all of another subset of said print elements and an insulating layer separating said subset of lands from said common land.
Claim 4
Dependent Claim
19 words
The thermal print head of claim 1, wherein said print elements comprise thin-film resistive layers deposited on said substrate.
Claim 5
Dependent Claim
17 words
The thermal print head of claim 1, wherein said rounded edge is substantially semicircular in cross section.
Claim 6
Dependent Claim
15 words
The thermal print head of claim 1, wherein said glaze is a sprayed procelain glaze.
Claim 7
Dependent Claim
21 words
The thermal print head of claim 1, wherein said print elements are disposed in a single line on said rounded edge.
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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |