US3400228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and circuit arrangement for central supervision of time measuring circuits of several functional units in telecommunications, particularly telephone exchange systems
Assignee: International Standard Electric Corp
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Filing: 1965-06-07
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Granted: 1968-09-03
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Expires: 1985-06-07
Abstract
No abstract record available.
Inventors
- 👤 Bubber Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:32
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/08; H04M3/12; H04M3/14
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) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |