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US2784264A
Expired / Lapsed
US
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Supervisory equipment for carrier-wave telephone systems
Assignee: Hartford National Bank and Trust Co
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Filing: 1953-11-16
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Granted: 1957-03-05
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Expires: 1973-11-16
Abstract
No abstract record available.
Inventors
- 👤 Hansen Hendrik Nicolaas
- 👤 Vitha Franz Anton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:48
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/74; H04B17/00; H04B17/40; H04B17/401; H04B17/402; H04B17/403
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) | 1960-03-04 | 1960-09-03 | 1961-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-04 | 1964-09-03 | 1965-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-04 | 1968-09-03 | 1969-03-05 | $7700.00 | Window Closed / Lapsed |