US4309242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing an electrostatically controlled picture display device
Assignee: US Philips Corp
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Filing: 1979-05-09
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Granted: 1982-01-05
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Expires: 1999-05-09
Abstract
Abstract A method for manufacturing an electrode which is secured to a supporting plate by means of flexible strip-shaped parts so as to be movable. The method includes the steps of providing a first layer of material which can be etched by means of a first etchant and a second layer which can be etched by means of a second etchant. The method also includes the step of providing by means of a photoetching method and a second etchant a plurality of apertures in the parts of the second layer which should not remain secured to the supporting plate. Parts of the first layer are removed by underetching by the apertures in the second layer with the first etchant.
Inventors
- 👤 Ties S. Te Velde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:20
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/372
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A method of manufacturing an electrode which is secured to a supporting plate by means of flexible stripshaped parts so as to be movable, characterized by (a) providing a first layer of a material which can be etched by means of a first etchant, (b) providing a second layer of an electrode material which can be etched by means of a second etchant, (c) providing by means of a photoetching method and the second etchant a plurality of apertures in the parts of the second layer which should not remain secured to the supporting plate, (d) removing parts of the first layer by underetching, via the apertures in the second layer, by means of the first etchant.
Claim 2
Independent Claim
117 words
A method of manufacturing an electrode which is secured to a supporting plate by means of flexible stripshaped parts so as to be movable, characterized by (a) providing a first layer of a material which can be etched by means of a first etchant, (b) providing a second layer of an electrode material which can be etched by means of a second etchant, (c) providing by means of a photoetching method and the second etchant a plurality of apertures in the parts of the second layer which should not remain secured to the supporting plate, (d) removing parts of the first layer by underetching, via the apertures in the second layer, by means of the first etchant.
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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |