US3011028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signaling system
Assignee: LEICH ELECTRIC CO
•
Filing: 1958-05-07
•
Granted: 1961-11-28
•
Expires: 1978-05-07
Abstract
No abstract record available.
Inventors
- 👤 Hans P Boswan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:33
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/515; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2306087A
Cited
US2367522A
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US2347108A
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US2386609A
Cited
US2386133A
Cited
US2406001A
Cited
US2636946A
Cited
US2672523A
Cited
US2864079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-27 | 1965-05-29 | 1965-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-27 | 1969-05-29 | 1969-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-27 | 1973-05-29 | 1973-11-28 | $7700.00 | Window Closed / Lapsed |