US3203830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical resistor
Assignee: International Resistance Co
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Filing: 1961-11-24
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Granted: 1965-08-31
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Expires: 1981-11-24
Abstract
No abstract record available.
Inventors
- 👤 William J Ostrander
- 👤 Carl H Schenskie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:35
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/006; H01C17/00; H01C17/06; H01C17/075; H01C17/08; H01C7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
AN ELECTRICAL RESISTOR HAVING A RELATIVELY HIGH RESISTANCE AND LOW TEMPERATURE COEFFICIENT TO RESISTANCE COMPRISING A BASE SUBSTRATE OF AN ELECTRICAL INSULATING MATERIAL, AND A LAYER OF A RESISTANCE MATERIAL ON THE SURFACE OF SAID BASE SUBSTRATE, SAID RESISTANCE MATERIAL LAYER CONSISTING ESSENTIALLY OF A HOMOGENEOUS MIXTURE OF CHROMIUM AND SILICON OXIDE WITH AT LEAST 42% BY VOLUME OF THE MIXTURE BEING CHROMIUM.
Claim 2
Dependent Claim
63 words
AN ELECTRICAL RESISTOR HAVING A RELATIVELY HIGH RESISTANCE AND LOW TEMPERATURE COEFFICIENT TO RESISTANCE COMPRISING A BASE SUBSTRATE OF AN ELECTRICAL INSULATING MATERIAL, AND A LAYER OF A RESISTANCE MATERIAL ON THE SURFACE OF SAID BASE SUBSTRATE, SAID RESISTANCE MATERIAL LAYER CONSISTING ESSENTIALLY OF A HOMOGENEOUS MIXTURE OF CHROMIUM AND SILICON OXIDE WITH AT LEAST 42% BY VOLUME OF THE MIXTURE BEING CHROMIUM.
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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |