Patent US3254154A successfully refreshed from Google Patents.
US3254154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic-to-metal seal for spark plugs
Assignee: —
•
Filing: —
•
Granted: 1966-05-31
•
Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:40
CPC Classifications
H; H01; H01T; H01T21/00; H01T21/02; H01T13/00; H01T13/20; H01T13/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A SPARK PLUG INCLUDING A GENERALLY TUBULAR SHAPED METAL SHELL HAVING AN INTERNAL ANNULAR SHOULD THEREIN, A CERAMIC INSULATOR IN SAID SHELL HAVING AN EXTERNAL ANNULAR SHOULDER POSITIONED ADJACENT THE INTERNAL ANNULAR SHOULDER OF SAID SHELL AND AN ANNULAR GASKET PRESSED TIGHTLY BETWEEN SAID SHOULDERS TO FORM A SEAL BETWEEN SAID INSULATOR AND SAID SHELL, SAID ANNULAR GASKET BEING OF AN ALUMINUM BASE ALLOY HAVING A ROCKWELL H HARDNESS OF AT LEAST 65 AND A TENSILE STRENGTH OF AT LEAST 16,000 P.S.I.
Claim 2
Dependent Claim
82 words
A SPARK PLUG INCLUDING A GENERALLY TUBULAR SHAPED METAL SHELL HAVING AN INTERNAL ANNULAR SHOULD THEREIN, A CERAMIC INSULATOR IN SAID SHELL HAVING AN EXTERNAL ANNULAR SHOULDER POSITIONED ADJACENT THE INTERNAL ANNULAR SHOULDER OF SAID SHELL AND AN ANNULAR GASKET PRESSED TIGHTLY BETWEEN SAID SHOULDERS TO FORM A SEAL BETWEEN SAID INSULATOR AND SAID SHELL, SAID ANNULAR GASKET BEING OF AN ALUMINUM BASE ALLOY HAVING A ROCKWELL H HARDNESS OF AT LEAST 65 AND A TENSILE STRENGTH OF AT LEAST 16,000 P.S.I.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |