US2503574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined pedestrian traffic signal and advertising device
Assignee: WALKOLITE Co Inc
•
Filing: 1947-05-06
•
Granted: 1950-04-11
•
Expires: 1967-05-06
Abstract
No abstract record available.
Inventors
- 👤 John S Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:38
CPC Classifications
G; G09; G09F; G09F13/00; G09F13/26; E; E01; E01F; E01F9/00; E01F9/50; E01F9/535; E01F9/547
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US682117A
Cited
US1051354A
Cited
GB191411906A
Cited
US1963293A
Cited
US1965874A
Cited
US2280010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |