US2921981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified two-channel multiplex system
Assignee: RCA Corp
•
Filing: 1954-04-26
•
Granted: 1960-01-19
•
Expires: 1974-04-26
Abstract
No abstract record available.
Inventors
- 👤 Marshall C Kidd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:56
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H04J; H04J3/00; H04J7/00; H04J7/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1906269A
Cited
US2262764A
Cited
US2352634A
Cited
GB552807A
Cited
US2344633A
Cited
US2424961A
Cited
US2607035A
Cited
US2683770A
Cited
US2773982A
Cited
US2706811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |