Patent GB615110A successfully refreshed from Google Patents.
US2547001A
Expired / Lapsed
US
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Drop channel pulse multiplex system
Assignee: STC PLC
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Filing: 1944-01-26
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Granted: 1951-04-03
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Expires: 1964-01-26
Abstract
No abstract record available.
Inventors
- 👤 Donald D Grieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:02
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US913521A
Cited
US1573959A
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US1655520A
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US2016452A
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US2048081A
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US2064907A
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US2262838A
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US2213941A
Cited
GB536963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |