US2853559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal transfer selector
Assignee: Underwood Corp
•
Filing: 1954-05-03
•
Granted: 1958-09-23
•
Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 Leonard Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:35
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/50; H04B1/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2370166A
Cited
US2505655A
Cited
US2603743A
Cited
US2591484A
Cited
US2536666A
Cited
US2713618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |