Patent US4604298A successfully refreshed from Google Patents.
US4604298A
Expired / Lapsed
US
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Finger line screen printing method and apparatus
Assignee: Gulton Industries Inc
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Filing: 1985-02-12
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Granted: 1986-08-05
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Expires: 2005-02-12
Abstract
Abstract A method of screen printing a conductive ink onto a substrate to form a pattern of narrow, closely spaced conductive lines. Before screening, the conductive ink is exposed to ambient air until its viscosity is in the range 700,000 to 900,000 centipoise at 70° Fahrenheit.
Inventors
- 👤 Victor Shevtchuk
- 👤 Nhut Chau
- 👤 Richard C. Schuessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:20
CPC Classifications
B; B41; B41M; B41M1/00; B41M1/12; H; H05; H05K; H05K3/00; H05K3/10; H05K3/12; H05K3/1216; H05K3/1225; H05K1/00; H05K1/02; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A method of screen printing a conductive ink onto a substrate to form a pattern of conductive lines adapted to be narrow and closely spaced, said method comprising the steps: leaving said conductive ink exposed to air until said ink has a viscosity ranging from 700,000 to 900,000 centipoise at 70° Fahrenheit, said air having temperature ranging from 65° to 75° Fahrenheit, and after said exposure forcing said ink through a screen onto said substrate, said screen being a thin metallic sheet having a pattern of apertures.
Claim 2
Independent Claim
87 words
A method of screen printing a conductive ink onto a substrate to form a pattern of conductive lines adapted to be narrow and closely spaced, said method comprising the steps: leaving said conductive ink exposed to air until said ink has a viscosity ranging from 700,000 to 900,000 centipoise at 70° Fahrenheit, said air having temperature ranging from 65° to 75° Fahrenheit, and after said exposure forcing said ink through a screen onto said substrate, said screen being a thin metallic sheet having a pattern of apertures.
Claim 3
Dependent Claim
22 words
The method of claim 1, at least two of said apertures being evenly spaced less than 0.005 inches apart, center to center.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said sheet has a thickness of the order of 0.001 inch.
Claim 5
Dependent Claim
14 words
The method of claim 2 wherein said apertures are less than 0.002 inch wide.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein said sheet is tensioned to have between 8 to 15 mils deflection per pound-force centrally applied.
Claim 7
Dependent Claim
32 words
The method of claim 4 whrein said sheet has a thickness of the order of 0.001 inch and is tensioned to have between 8 to 15 mils deflection per pound-force centrally applied.
Claim 8
Dependent Claim
30 words
The method of screen printing a conductive ink according to claim 6, further comprising the step: thereafter firing said substrate at a peak temperature ranging from 800° to 900° Celsius.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |