Patent US2586825A successfully refreshed from Google Patents.
US2586825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal compression and expansion arrangements in electric communication systems
Assignee: International Standard Electric Corp
•
Filing: 1949-01-14
•
Granted: 1952-02-26
•
Expires: 1969-01-14
Abstract
No abstract record available.
Inventors
- 👤 Jacobsen Bent Bulow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04B14/04; H04B14/046; H04B14/048
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2185693A
Cited
US2213938A
Cited
US2272070A
Cited
US2314707A
Cited
US2449467A
Cited
CH249263A
Cited
US2438908A
Cited
US2451044A
Cited
US2464607A
Cited
US2437707A
Cited
US2453461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |