Patent US2840628A successfully refreshed from Google Patents.
US2840628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug
Assignee: —
•
Filing: —
•
Granted: 1958-06-24
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Expires: 1975-06-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:28
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/04; H01T13/05; H01T13/20; H01T13/36; H01T21/00; H01T21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1191162A
Cited
US2352481A
Cited
US1927500A
Cited
US1967480A
Cited
US2150725A
Cited
US2437209A
Cited
US2377481A
Cited
US2445777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |