US2998632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making spark plug electrode structures
Assignee: Union Carbide Corp
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Filing: 1959-06-10
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Granted: 1961-09-05
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Expires: 1979-06-10
Abstract
No abstract record available.
Inventors
- 👤 Donald M Yenni
- 👤 Walter A Runck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:12
CPC Classifications
H; H01; H01T; H01T21/00; H01T21/02; C; C23; C23C; C23C4/00; C23C4/01; C23C4/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
PROCESS OF MAKING SPARK PLUGS HAVING CONCENTRIC RING ELECTRODES FOR INTERNAL COMBUSTION ENGINES, WHICH COMPRISES THE STEPS OF ELECTRIC ARC SPRAYING CONSECUTIVE LAYERS OF REFRACTORY ELECTRODE METAL, REFRACTORY INSULATING MATERIAL AND REFRACTORY ELECTRODE METAL ONTO THE END REGION OF A SUITABLE BASE MEMBER, AND GRINDING AWAY AN
Claim 2
Dependent Claim
47 words
PROCESS OF MAKING SPARK PLUGS HAVING CONCENTRIC RING ELECTRODES FOR INTERNAL COMBUSTION ENGINES, WHICH COMPRISES THE STEPS OF ELECTRIC ARC SPRAYING CONSECUTIVE LAYERS OF REFRACTORY ELECTRODE METAL, REFRACTORY INSULATING MATERIAL AND REFRACTORY ELECTRODE METAL ONTO THE END REGION OF A SUITABLE BASE MEMBER, AND GRINDING AWAY AN
References Cited (Backward Citations)
US2265352A
Cited
US2864152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |