Patent US2254498A successfully refreshed from Google Patents.
US2254498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic display device and method of making same
Assignee: QUIXET Inc
•
Filing: 1938-10-05
•
Granted: 1941-09-02
•
Expires: 1958-10-05
Abstract
No abstract record available.
Inventors
- 👤 John H Scharf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:28
CPC Classifications
G; G09; G09F; G09F7/00; G09F7/02; G09F7/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-09-01 | 1945-03-03 | 1945-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-09-01 | 1949-03-03 | 1949-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-09-01 | 1953-03-03 | 1953-09-02 | $7700.00 | Window Closed / Lapsed |