Patent US2273193A successfully refreshed from Google Patents.
US2273193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave transmission and shaping
Assignee: AT&T Inc
•
Filing: 1938-10-07
•
Granted: 1942-02-17
•
Expires: 1958-10-07
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Helsing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:25
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/10; F; F23; F23K; F23K3/00; G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/34; H03; H03G; H03G5/00; H03G5/16; H03G5/24; H03G5/26; H03K; H03K9/00; H03K9/04; F23K2203/00; F23K2203/004
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1945-02-16 | 1945-08-18 | 1946-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-16 | 1949-08-18 | 1950-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-16 | 1953-08-18 | 1954-02-17 | $7700.00 | Window Closed / Lapsed |