US3620795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent mask and method for making the same
Assignee: Signetics Corp
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Filing: 1968-04-29
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Granted: 1971-11-16
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Expires: 1988-04-29
Abstract
Abstract Transparent glass mask having a copper stain formed therein, the outer perimeters of which have a depth greater than the inner portion of the stain and a method for making the same in which a pattern of aluminum is formed on the glass and serves as a mask for driving the copper into the glass.
Inventors
- 👤 William M Kiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:00
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
A method as in claim 1 together with the step of reducing the copper which has been driven into the glass substrate into an elemental copper by exposing the glass substrate to a reducing gas at an elevated temperature.
Claim 2
Dependent Claim
32 words
A method as in claim 1 wherein the aluminum is deposited to a thickness of approximately 500 Angstroms and wherein the copper is deposited to a thickness of greater than 500 Angstroms.
Claim 3
Dependent Claim
56 words
A method as in claim 1 wherein the step of causing the copper to be driven into the glass includes the steps of first heating the substrate and carrying the copper to an elevated temperature and subjecting the copper to a strong electric field to aid in the diffusion of the copper into the glass substrate.
Claim 4
Dependent Claim
35 words
A method as in claim 4 wherein the electric field has lines which are substantially perpendicular to the layer of copper carried by the substrate so that the copper is driven straight into the substrate.
Claim 5
Dependent Claim
38 words
A method as in claim 4 wherein the substrate is heated to a temperature of approximately 345* C. and wherein said substrate is subjected to a voltage of approximately 1500 volts for a period of approximately 10 seconds.
Claim 6
Dependent Claim
23 words
A method as in claim 1 wherein a layer of aluminum is deposited first and wherein the openings are formed in the aluminum.
Claim 7
Dependent Claim
23 words
A method as in claim 1 wherein a layer of copper is deposited first and wherein the openings are formed in the copper.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |