Patent US2721232A successfully refreshed from Google Patents.
US2721232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal-transmission circuit
Assignee: Siemens and Halske AG
•
Filing: 1952-10-25
•
Granted: 1955-10-18
•
Expires: 1972-10-25
Abstract
No abstract record available.
Inventors
- 👤 Kreuzer Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:09
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/22; H04L12/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |