US2812509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Private line system
Assignee: Unisys Corp
•
Filing: 1953-08-31
•
Granted: 1957-11-05
•
Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 Richard J Phelps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:49
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1665622A
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US1888904A
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US2387444A
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US2409696A
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US2562176A
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US2497936A
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US2601393A
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US2649502A
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US2670463A
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US2669706A
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US2677119A
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US2626314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |