Patent EP0425783A1 successfully refreshed from Google Patents.
Patent US6379368B1 successfully refreshed from Google Patents.
US2740106A
Expired / Lapsed
US
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Private line communication system
Assignee: GAYE MARVIN
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Filing: 1954-10-26
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Granted: 1956-03-27
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Expires: 1974-10-26
Abstract
No abstract record available.
Inventors
- 👤 Richard J Phelps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:18
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04L; H04L1/00; H04L1/12; H04L1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US784393A
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US1933650A
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US2059204A
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US2440118A
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US2497936A
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US2666911A
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US2533242A
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US2626383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |