Patent US2550803A successfully refreshed from Google Patents.
US2550803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record
Assignee: RCA Corp
•
Filing: 1949-08-24
•
Granted: 1951-05-01
•
Expires: 1969-08-24
Abstract
No abstract record available.
Inventors
- 👤 De Witt R Goddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1442682A
Cited
US1882336A
Cited
GB512766A
Cited
US2229293A
Cited
US2479868A
Cited
US2496047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |