Patent US2864896A successfully refreshed from Google Patents.
US2864896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for recording sound oscillations in spiral grooves on a plate-shaped carrier
Assignee: US Philips Corp
•
Filing: 1954-03-22
•
Granted: 1958-12-16
•
Expires: 1974-03-22
Abstract
No abstract record available.
Inventors
- 👤 Boontje Jan
- 👤 Lauterslager Henk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:51
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/68; G11B3/72
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) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |