US2810122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Private line voice communication system
Assignee: Unisys Corp
•
Filing: 1953-09-23
•
Granted: 1957-10-15
•
Expires: 1973-09-23
Abstract
No abstract record available.
Inventors
- 👤 Walter C Lanning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:17
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04W88/187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1662877A
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US888153A
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US1004566A
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US1464565A
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US1882010A
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US1888985A
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US1960779A
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US2140138A
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US2387444A
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US2391868A
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US2589130A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |