US2421333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplex carrier current communication system with transmission line impedance control means
Assignee: International Standard Electric Corp
•
Filing: 1943-04-13
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Granted: 1947-05-27
•
Expires: 1963-04-13
Abstract
No abstract record available.
Inventors
- 👤 Katchatouroff Leon
- 👤 Marc A Lalande
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:00
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |