US3567658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistor composition
Assignee: Motors Liquidation Co
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Filing: 1967-12-21
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Granted: 1971-03-02
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Expires: 1987-12-21
Abstract
Abstract AN IMPROVED RESISTOR COMPOSITION FOR USE IN RESISTOR SPARK PLUGS AND OTHER ELECTRICAL DEVICES IS DISCLOSED. THE RESISTOR COMPOSITION CONTAINS A COMPOUND TAKEN FROM THE GROUP CONSISTING OF LITHIUM CARBONATE, ZINC CARBONATE, MAGNESIUM CABONATE AND SODIUM CARBONATE AND A METAL POWDER TAKENFROM THE GROUP CONSISTING OF ZINC, ANTIMONY AND TELLURIUM IN ADDITION TO THE CONVENTIONAL RESISTOR COMPOSITION INGREDIENTS. THE CARBONATE, FOR EXAMPLE, LITHIUM CARBONATE, AND THE METAL, FOR EXAMPLE, ZINC, COMBINE TO YIELD A STRONG RESISTOR MASS HAVING A LOW POROSITY WHICH BONDS TIGHTLY TO THE CENTER ELECTRODE HEAD IN THE SPARK PLUG INSULATOR CENTERBORE.
Inventors
- 👤 Richard A Webb
- 👤 Patrick N Kesten
- 👤 Karl Schwartzwalder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
H; H01; H01C; H01C1/00; H01T; H01T13/00; H01T13/40; H01T13/41
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |