US2816273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial transmission line
Assignee: Sprague Electric Co
•
Filing: 1952-08-01
•
Granted: 1957-12-10
•
Expires: 1972-08-01
Abstract
No abstract record available.
Inventors
- 👤 David B Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:35
CPC Classifications
H; H01; H01P; H01P11/00; H01P11/001; H01P11/003; H01C; H01C7/00; H01P9/00; H01P9/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1784611A
Cited
GB340144A
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US2375097A
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US2537959A
Cited
US2614524A
Cited
US2504178A
Cited
US2593829A
Cited
US2721311A
Cited
US2634314A
Cited
US2721310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |