Patent US2540481A successfully refreshed from Google Patents.
US2540481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal for model railroads
Assignee: Individual
•
Filing: 1945-12-19
•
Granted: 1951-02-06
•
Expires: 1965-12-19
Abstract
No abstract record available.
Inventors
- 👤 Heise Paul Alexis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:36
CPC Classifications
A; A63; A63H; A63H19/00; A63H19/34
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB189620786A
Cited
US856273A
Cited
US801543A
Cited
US921625A
Cited
US910911A
Cited
US1057038A
Cited
US1427881A
Cited
US1775422A
Cited
US1744794A
Cited
US1966031A
Cited
US2088174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |