Patent US2551350A successfully refreshed from Google Patents.
US2551350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical apparatus
Assignee: OPERADIO Manufacturing CO
•
Filing: 1947-05-23
•
Granted: 1951-05-01
•
Expires: 1967-05-23
Abstract
No abstract record available.
Inventors
- 👤 Michael C Supitilov
- 👤 Robert H Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:30
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2153211A
Cited
US1888910A
Cited
US1759581A
Cited
US1975928A
Cited
US1926879A
Cited
US2022665A
Cited
US2096020A
Cited
US2379505A
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 |