Patent US3407326A successfully refreshed from Google Patents.
US3407326A
Expired / Lapsed
US
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Spark plug having a composite gold or gold alloy electrode and a process for its manufacture
Assignee: Ford Motor Co
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Filing: 1967-03-14
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Granted: 1968-10-22
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Expires: 1987-03-14
Abstract
No abstract record available.
Inventors
- 👤 Donald J Romine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:06
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1296938A
Cited
US1515866A
Cited
US2171249A
Cited
US2296033A
Cited
US2391458A
Cited
US2831138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |