Patent US4342453A successfully refreshed from Google Patents.
Patent US2772888A successfully refreshed from Google Patents.
US2772888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of stereophonic phonograph records
Assignee: CBS Broadcasting Inc
•
Filing: 1952-12-18
•
Granted: 1956-12-04
•
Expires: 1972-12-18
Abstract
No abstract record available.
Inventors
- 👤 Daniel P Doncaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:43
CPC Classifications
G; G11; G11B; G11B3/00
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) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |