Patent US3348091A successfully refreshed from Google Patents.
US3348091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug seal having a lower coefficient of expansion than the ceramic insulator core
Assignee: Motors Liquidation Co
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Filing: 1965-04-12
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Granted: 1967-10-17
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Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 Harold H Abdella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:20
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/16; H01T13/20; H01T13/34; H01T13/46; H01T13/462
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A SPARK PLUG COMPRISING AN INSULATOR HAVING A CENTERBORE THERETHROUGH, A FUSED HERMETIC METAL-GLASS SEAL OF HIGH ELECTRICAL CONDUCTIVITY IN SAID CENTERBORE, SAID SEAL BEING POSITIONED PERPENDICULARLY TO THE LONGITUDINAL AXIS OF SAID CENTERBORE AND BONDED TO THE INSULATOR WALLS TO PREVENT THE FLOW OF GAS THROUGH THE CENTERBORE, SAID SEAL HAVING A COEFFICIENT OF EXPANSION LOWER THAN SAID INSULATOR WHICH IS SUFFICIENT FOR SAID INSULATOR TO EXERT A COMPRESSIVE FORCE ON SAID SEAL, SAID SEAL CONTAINING METAL POWDER HAVING METAL PARTICLES HAVING A SIZE SMALLER THAN 10 MESH
Claim 2
Dependent Claim
89 words
A SPARK PLUG COMPRISING AN INSULATOR HAVING A CENTERBORE THERETHROUGH, A FUSED HERMETIC METAL-GLASS SEAL OF HIGH ELECTRICAL CONDUCTIVITY IN SAID CENTERBORE, SAID SEAL BEING POSITIONED PERPENDICULARLY TO THE LONGITUDINAL AXIS OF SAID CENTERBORE AND BONDED TO THE INSULATOR WALLS TO PREVENT THE FLOW OF GAS THROUGH THE CENTERBORE, SAID SEAL HAVING A COEFFICIENT OF EXPANSION LOWER THAN SAID INSULATOR WHICH IS SUFFICIENT FOR SAID INSULATOR TO EXERT A COMPRESSIVE FORCE ON SAID SEAL, SAID SEAL CONTAINING METAL POWDER HAVING METAL PARTICLES HAVING A SIZE SMALLER THAN 10 MESH
References Cited (Backward Citations)
US2988662A
Cited
US2248415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |