US2521683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traffic detection apparatus
Assignee: Eastern Ind Inc
•
Filing: 1944-06-29
•
Granted: 1950-09-12
•
Expires: 1964-06-29
Abstract
No abstract record available.
Inventors
- 👤 John L Barker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2106770A
Cited
US2206903A
Cited
US695764A
Cited
US1973563A
Cited
US2011392A
Cited
US1939436A
Cited
US2144535A
Cited
US2122410A
Cited
US2238107A
Cited
US2300613A
Cited
US2268587A
Cited
US2248599A
Cited
US2347194A
Cited
US2280109A
Cited
US2311837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |