US3244556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion for thin film resistance control
Assignee: Xerox Corp
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Filing: 1962-10-01
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Granted: 1966-04-05
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Expires: 1982-10-01
Abstract
No abstract record available.
Inventors
- 👤 Casimir J Mytych
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:05
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; H01C17/245; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE METHOD FOR FORMING A TEMPERATURE STABLE THIN FILM ELECTRICAL RESISTOR OF PREDETERMINED RESISTANCE, COMPRISING: (A) DEPOSITING A FILM OF RESISTIVE MATERIAL ON A DIELECTRIC SUBSTRATE HAVING A SURFACE OF MINUTE PEAKS AND VALLEYS, SAID FILM HAVING (1) A RESISTANCE LOWER THAN THE PREDETERMINED RESISTANCE, (2) AN OVERALL NEGATIVE TEMPERATURE COEFFICIENT OF RESISTANCE, AND, (3) A NON-UNIFORM THICKNESS, WITH RELATIVELY THINNER DEPOSITS OF RESISTIVE MATERIAL OVER THE MINUTE PEAKS AS COMPARED WITH DEPOSITS OF RESISTIVE MATERIAL IN THE VALLEYS OF SAID DIELECTRIC SUBSTRATE; AND (B) RANDOMLY REMOVING SOME OF SAID THINNER DEPOSITS FROM SAID FILM, WHEREBY, THE PREDETERMINED RESISTANCE IS ACHIEVED AND SAID TEMPERATURE COEFFICIENT OF RESISTANCE IS MADE LESS NEGATIVE.
Claim 2
Independent Claim
111 words
THE METHOD FOR FORMING A TEMPERATURE STABLE THIN FILM ELECTRICAL RESISTOR OF PREDETERMINED RESISTANCE, COMPRISING: (A) DEPOSITING A FILM OF RESISTIVE MATERIAL ON A DIELECTRIC SUBSTRATE HAVING A SURFACE OF MINUTE PEAKS AND VALLEYS, SAID FILM HAVING (1) A RESISTANCE LOWER THAN THE PREDETERMINED RESISTANCE, (2) AN OVERALL NEGATIVE TEMPERATURE COEFFICIENT OF RESISTANCE, AND, (3) A NON-UNIFORM THICKNESS, WITH RELATIVELY THINNER DEPOSITS OF RESISTIVE MATERIAL OVER THE MINUTE PEAKS AS COMPARED WITH DEPOSITS OF RESISTIVE MATERIAL IN THE VALLEYS OF SAID DIELECTRIC SUBSTRATE; AND (B) RANDOMLY REMOVING SOME OF SAID THINNER DEPOSITS FROM SAID FILM, WHEREBY, THE PREDETERMINED RESISTANCE IS ACHIEVED AND SAID TEMPERATURE COEFFICIENT OF RESISTANCE IS MADE LESS NEGATIVE.
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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |