Patent US3663276A successfully refreshed from Google Patents.
US3663276A
Expired / Lapsed
US
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Method of adjusting the resistivity of thick-film screen-printed resistors
Assignee: RCA Licensing Corp
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Filing: 1970-05-25
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Granted: 1972-05-16
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Expires: 1990-05-25
Abstract
Abstract Method of adjusting the resistivity of a thick-film resistor of the type made by screen printing on a substrate a composition comprising metal particles, glass frit, a temporary organic binder and a temporary solvent, drying to remove the solvent, and firing the composition to fuse the glass frit and burn off the binder, said method comprising determining the relationship between the resistivity of the fired composition and the drying time that elapses between screen printing the composition on the substrate and the beginning of the firing cycle, and setting this elapsed time in accordance with a desired resistivity value.
Inventors
- 👤 Trevor Richard Allington
- 👤 James Richard Mcclellan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:24
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/26; H01C17/265; H01C17/06; H01C17/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A method according to claim 1 including the further steps of monitoring resistivity of the fired resistors as they are produced and, as the resistivity drifts away from the desired value, adjusting the length of said time the printed composition is permitted to stand between printing and firing to bring the resistivity of subsequently fired resistors back to the desired value.
Claim 2
Dependent Claim
39 words
A method according to claim 1 in which the screen printing is done with a screen of about 200 mesh and said time the printed composition is permitted to stand between printing and firing is at least 7 minutes.
Claim 3
Dependent Claim
21 words
A method according to claim 1 in which the solvent constitutes about 18.9 to 29.3% by weight of the printed-on composition.
Claim 4
Dependent Claim
24 words
A method according to claim 4 in which the amount of said binder is about 2-6% by weight of the composition after solvent removal.
References Cited (Backward Citations)
US2886476A
Cited
US2950995A
Cited
US2950996A
Cited
US3052573A
Cited
US3252831A
Cited
US3539392A
Cited
US3484284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |