US2749246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug insulator containing ceric oxide
Assignee: Federal Mogul Ignition LLC
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Filing: 1951-10-26
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Granted: 1956-06-05
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Expires: 1971-10-26
Abstract
No abstract record available.
Inventors
- 👤 Harry G Schurecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:54
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; C; C04; C04B; C04B35/00; C04B35/01; C04B35/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
A CERAMIC SPARK PLUG INSULATOR PRODUCED BY SINTERING A SUBSTANTIALLY SILICA-FREE BLEND OF REFRACTORY MATERIALS CONSISTING ESSENTIALLY OF FROM 10 PER CENT TO 80 PER CENT OF AN OXIDE OF CERIUM, FROM 20 PER CENT TO 90 PER CENT OF BEO, AND FROM A TRACE TO 20 PER CENT OF ALUMINA, AND WHEREIN AN OXIDE OF CERIUM CONSTITUTES AT LEAST 20 PER CENT OF EVERY BLEND CONTAINING NOT MORE THAN 80 PER CENT OF BEO.
References Cited (Backward Citations)
US2152655A
Cited
US2491412A
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GB230445A
Cited
US2071452A
Cited
US2174390A
Cited
US2336182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |