US2549828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulation system
Assignee: Individual
•
Filing: 1945-08-30
•
Granted: 1951-04-24
•
Expires: 1965-08-30
Abstract
No abstract record available.
Inventors
- 👤 Melvin L Leppert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:15
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/16; H03C1/18; H03C1/22; H04; H04N; H04N5/00; H04N5/38; H04N5/40
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |