US2877409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measurement of group delay in electric communication systems
Assignee: International Standard Electric Corp
•
Filing: 1955-02-16
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Granted: 1959-03-10
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Expires: 1975-02-16
Abstract
No abstract record available.
Inventors
- 👤 Jacobsen Bent Bulow
- 👤 Feldhusen Igor Vladimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:38
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/46; H04B3/48; H04B3/462
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1450966A
Cited
US2542627A
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US2554391A
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US2588094A
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US2625614A
Cited
US2774873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |