Patent US4348255A successfully refreshed from Google Patents.
US4348255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of an optically transparent and electrically conductive film pattern
Assignee: US Philips Corp
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Filing: 1980-07-03
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Granted: 1982-09-07
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Expires: 2000-07-03
Abstract
Abstract An optically transparent and electrically conductive film pattern on a substrate, e.g., an electrooptical display plate provided with a patterned transparent electrode layer, is prepared by a process in which an optically transparent layer of electrically conductive material, coated on the substrate, is removed in predetermined areas by an etching treatment. In this process, the areas of the optically transparent layer on the substrate which are to be removed by etching are printed with an etchant composition which contains an etching agent for the electrically conductive material. The composition is then allowed to remain in contact with the electrically conductive material in order to etch through the areas covered by the composition. Finally, the products formed by reaction of the etchant products formed by reaction of the etchant with the conductive material are removed together with the unspent portions of the composition.
Inventors
- 👤 Walter Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:24
CPC Classifications
C; C03; C03C; C03C23/00; C09; C09K; C09K13/00; C09K13/04; C23; C23F; C23F1/00; C23F1/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/13439
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A process for producing a patterned, optically transparent electrically conducting film on a substrate comprising: (a) providing a substrate coated with a continuous layer of an optically transparent electrically conductive material; (b) depositing by screen printing on selected areas of said layer an etchant composition comprising an acid etchant for said optically transparent electrically conductive material and a carrier therefor, said etchant being capable of reacting with said optically transparent electrically conductive material to form soluble reaction products; (c) allowing said etchant composition to contact said optically transparent electrically conductive material until said material has reacted with said etchant in said selected areas; (d) removing from said substrate the etchant composition and the products of reaction between said etchant and said optically transparent electrically conductive material.
Claim 2
Dependent Claim
126 words
A process for producing a patterned, optically transparent electrically conducting film on a substrate comprising: (a) providing a substrate coated with a continuous layer of an optically transparent electrically conductive material; (b) depositing by screen printing on selected areas of said layer an etchant composition comprising an acid etchant for said optically transparent electrically conductive material and a carrier therefor, said etchant being capable of reacting with said optically transparent electrically conductive material to form soluble reaction products; (c) allowing said etchant composition to contact said optically transparent electrically conductive material until said material has reacted with said etchant in said selected areas; (d) removing from said substrate the etchant composition and the products of reaction between said etchant and said optically transparent electrically conductive material.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said inert carrier is a carrier suitable for screen printing.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein said carrier is a viscous essential oil.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said electrically conductive material comprises at least one semi-conducting metal oxide.
Claim 6
Dependent Claim
24 words
The process of claim 4 wherein said semiconductive metal oxide is selected from the group consisting of indium (III) oxide and tin (IV) oxide.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein said etching composition contains a mineral acid.
Claim 8
Dependent Claim
12 words
The process of claim 6 wherein said mineral acid is phosphoric acid.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein step (c) is carried out at temperatures between ambient temperature and 100° C.
Claim 10
Dependent Claim
19 words
The process of claim 8 wherein step (c) is carried out at a temperature between 30° and 60° C.
Claim 11
Dependent Claim
18 words
The process of claim 8 wherein step (c) is carried out at a temperature of about 60° C.
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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |