US3042474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vern m
Assignee: —
•
Filing: —
•
Granted: 1962-07-03
•
Expires: 1979-07-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:12
CPC Classifications
H; H01; H01T; H01T21/00; H01T21/02; H01T13/00; H01T13/20; H01T13/39; B; B22; B22F; B22F3/00; B22F3/02; B22F3/10; C; C22; C22C; C22C1/00; C22C1/04; C22C1/0466; B22F2998/00; B22F2998/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
A SPARK PLUG COMPRISING A METAL SHELL, A CERAMIC INSULATOR IN SAID SHELL HAVING A CENTERBORE THERETHROUGH AND AN ELECTRODE IN SAID CENTERBORE, SAID ELECTRODE CONSISTING ESSENTIALLY OF ABOUT 5% TO 30% BY WEIGHT SILVER AND THE REMAINDER A HARD HEAT RESISTANT METAL IN WHICH SAID SILVER IS SUBSTANTIALLY INSOLUBLE, AT LEAST A MAJOR PORTION OF SAID SILVER BEING UNALLOYED AND PRESENT AS A NETWORK OF ELONGATED STRINGERS WHICH EXTEND GENERALLY PARALLEL TO THE LONGITUDINAL AXIS OF THE ELECTRODE.
References Cited (Backward Citations)
US1907931A
Cited
US1907930A
Cited
US1907932A
Cited
US2406966A
Cited
US2358326A
Cited
US2476208A
Cited
US2730594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |