Patent US2448771A successfully refreshed from Google Patents.
US2448771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray oscillograph circuit
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1943-09-23
•
Granted: 1948-09-07
•
Expires: 1963-09-23
Abstract
No abstract record available.
Inventors
- 👤 Peter S Christaldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:33
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1622851A
Cited
US2210702A
Cited
US2137354A
Cited
US2179111A
Cited
US2196838A
Cited
US2059004A
Cited
US2222943A
Cited
US2230926A
Cited
US2289821A
Cited
US2313122A
Cited
US2265744A
Cited
US2315369A
Cited
US2363810A
Cited
US2343988A
Cited
US2369138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |