US2594633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Record changer
Assignee: Philips North America LLC
•
Filing: 1945-11-29
•
Granted: 1952-04-29
•
Expires: 1965-11-29
Abstract
No abstract record available.
Inventors
- 👤 Freimann Frank
- 👤 Sr Arthur L Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:24
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)
US1377027A
Cited
US1883238A
Cited
US1868846A
Cited
US2007054A
Cited
GB490551A
Cited
US2323365A
Cited
US2340418A
Cited
US2348766A
Cited
US2406355A
Cited
US2458496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |