Patent US1366548A successfully refreshed from Google Patents.
US1366548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Change-sign device
Assignee: Individual
•
Filing: 1919-09-25
•
Granted: 1921-01-25
•
Expires: 1939-09-25
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Willison
- 👤 Clifford N Esberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:48
CPC Classifications
G; G09; G09F; G09F11/00; G09F11/02; G09F11/025
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) | 1924-01-25 | 1924-07-26 | 1925-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-01-25 | 1928-07-26 | 1929-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-01-25 | 1932-07-26 | 1933-01-25 | $7700.00 | Window Closed / Lapsed |