US3215131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glow plugs and installation in the engine head
Assignee: Industrie Magneti Marelli SRL
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Filing: 1964-03-16
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Granted: 1965-11-02
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Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Testerini Francesco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
F; F23; F23Q; F23Q7/00; F23Q7/001; H; H01; H01T; H01T13/00; H01T13/20; H01T13/34; H01T13/46; H01T13/467; H01T13/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
AN IGNITION SPARK PLUG WITH A SPARK PATH PARTLY GRAZING THE SURFACE OF ITS INSULATOR COMPRISING A CENTER ELECTRODE SURROUNDED TO ITS TIP BY A THIN INSULATOR, AN OUTER ELECTRODE COMPRISING A METAL BODY PORTION CONCENTRICALLY SURROUNDING THE INSULATOR AND TERMINATING IN A PLANE CONFINED WITHIN THE END OF THE PLUG AND COMMON WITH THE END OF THE CENTER ELECTRODE AND THE END OF ITS SURROUNDING INSULATOR TO CAUSE, THEREBY, THE SPARK BETWEEN THE ELECTRODES TO GRAZE THE INSULATOR, AN ANNULAR CHAMBER BETWEEN SAID BODY AND SAID INSULATOR, AND RADIALLY EXTENDING SYMMETRICAL PASSAGES IN THE METAL BODY ABOUT SAID CENTER ELECTRODE COMMUNICATING WITH THE CHAMBER THEREBY TO PROVIDE HOMOGENEOUS INTERCHANGE OF GASES WITHIN SAID CHAMBER WHEREIN THE OUTER ELECTRODE IS AN INTEGRAL PORTION OF A PLUG BODY MEMBER PROVIDED WITH MOUNTING THREADS FOR INSERTION INTO AN ENGINE HEAD WHICH HAS THE END OF THE BODY FLARED INWARDLY.
Claim 2
Dependent Claim
147 words
AN IGNITION SPARK PLUG WITH A SPARK PATH PARTLY GRAZING THE SURFACE OF ITS INSULATOR COMPRISING A CENTER ELECTRODE SURROUNDED TO ITS TIP BY A THIN INSULATOR, AN OUTER ELECTRODE COMPRISING A METAL BODY PORTION CONCENTRICALLY SURROUNDING THE INSULATOR AND TERMINATING IN A PLANE CONFINED WITHIN THE END OF THE PLUG AND COMMON WITH THE END OF THE CENTER ELECTRODE AND THE END OF ITS SURROUNDING INSULATOR TO CAUSE, THEREBY, THE SPARK BETWEEN THE ELECTRODES TO GRAZE THE INSULATOR, AN ANNULAR CHAMBER BETWEEN SAID BODY AND SAID INSULATOR, AND RADIALLY EXTENDING SYMMETRICAL PASSAGES IN THE METAL BODY ABOUT SAID CENTER ELECTRODE COMMUNICATING WITH THE CHAMBER THEREBY TO PROVIDE HOMOGENEOUS INTERCHANGE OF GASES WITHIN SAID CHAMBER WHEREIN THE OUTER ELECTRODE IS AN INTEGRAL PORTION OF A PLUG BODY MEMBER PROVIDED WITH MOUNTING THREADS FOR INSERTION INTO AN ENGINE HEAD WHICH HAS THE END OF THE BODY FLARED INWARDLY.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |