US3144576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug and method of manufacture
Assignee: Individual
•
Filing: 1962-02-14
•
Granted: 1964-08-11
•
Expires: 1982-02-14
Abstract
No abstract record available.
Inventors
- 👤 Hagmaier Eugen
- 👤 Riethmuller Paul
- 👤 Leinert Paula
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:06
CPC Classifications
H; H01; H01T; H01T21/00; H01T21/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
IN A SPARK PLUG, AN ELECTRODE, SAID ELECTRODE COMPRISING A CLOSED ENDED TUBE OF A RELATIVELY HIGH-TEMPERATURE, OXIDATION-RESISTANT METAL, A CORE IN SAID TUBE OF A RELATIVELY SOFTER METAL HAVING A HIGHER HEAT CONDUCTIVITY AND BETWEEN SAID CORE AND SAID TUBE THE SUBSTANTIALLY UNIFORM INITIMATE BOND OBTAINED BY CONCURRENTLY COLD EXTRUDING SAID CORE AND SAID TUBE METAL.
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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |