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Patent US2520185A successfully refreshed from Google Patents.
US2520185A
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Pulse intercommunication telephone system
Assignee: International Standard Electric Corp
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Filing: 1947-08-06
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Granted: 1950-08-29
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Expires: 1967-08-06
Abstract
No abstract record available.
Inventors
- 👤 Stanislas Van Mierlo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:14
CPC Classifications
H; H04; H04J; H04J3/00; H04M; H04M9/00; H04M9/02; H04M9/022; H04M9/025; H04Q; H04Q5/00; H04Q5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2406165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |