US2806971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass seal for spark plug electrode assembly
Assignee: Individual
•
Filing: 1952-05-21
•
Granted: 1957-09-17
•
Expires: 1972-05-21
Abstract
No abstract record available.
Inventors
- 👤 Twells Robert
- 👤 Frank C Arrance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:14
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/34; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2100187A
Cited
US2293381A
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US2265352A
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US2267571A
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US2317305A
Cited
US2321840A
Cited
US2436644A
Cited
US2508354A
Cited
US2696652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |