US2323033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrier frequency telephone system
Assignee: Individual
•
Filing: 1941-04-22
•
Granted: 1943-06-29
•
Expires: 1961-04-22
Abstract
No abstract record available.
Inventors
- 👤 Hagen Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:46
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/36; H04B3/38; B; B62; B62H; B62H1/00; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/58; B62H2700/00; B62H2700/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-06-28 | 1946-12-28 | 1947-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-06-28 | 1950-12-28 | 1951-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-06-28 | 1954-12-28 | 1955-06-29 | $7700.00 | Window Closed / Lapsed |