US2259960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarized, two-wire, progressive, noninterfering signal system
Assignee: American District Telegraph Co
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Filing: 1937-09-21
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Granted: 1941-10-21
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Expires: 1957-09-21
Abstract
No abstract record available.
Inventors
- 👤 Manfred W Muehter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:28
CPC Classifications
H; H04; H04Q; H04Q5/00; H04Q5/02; H04Q5/14; H04Q5/16; G; G08; G08B; G08B25/00; G08B25/01; G08B25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-10-20 | 1945-04-21 | 1945-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-10-20 | 1949-04-21 | 1949-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-10-20 | 1953-04-21 | 1953-10-21 | $7700.00 | Window Closed / Lapsed |