Patent US3682840A successfully refreshed from Google Patents.
US3682840A
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US
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Electrical resistor containing lead ruthenate
Assignee: Airco Inc
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Filing: 1970-10-19
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Granted: 1972-08-08
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Expires: 1990-10-19
Abstract
Abstract ELECTRICALLY RESISTIVE COMPOSITIONS AND RESISTIVE ELEMENTS ARE DISCLOSED COMPRISING LEAD RUTHENATE AND MIXTURES THEREOF WITH RUTHENIUM DIOXIDE DISPERSED IN ELECTRICALLY INSULATING INERT MATRICES.
Inventors
- 👤 Paul R Van Loan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:47
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C8/00; C03C8/02; C03C8/10; C03C8/14; H01B; H01B1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |