US2263369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplex telephony system
Assignee: Hartford National Bank and Trust Co
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Filing: 1940-01-08
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Granted: 1941-11-18
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Expires: 1960-01-08
Abstract
No abstract record available.
Inventors
- 👤 Skillman Thomas Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:36
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/12
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) | 1944-11-17 | 1945-05-19 | 1945-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-11-17 | 1949-05-19 | 1949-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-11-17 | 1953-05-19 | 1953-11-18 | $7700.00 | Window Closed / Lapsed |