US3493213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highway barrier
Assignee: Bethlehem Steel Corp
•
Filing: 1968-09-17
•
Granted: 1970-02-03
•
Expires: 1988-09-17
Abstract
No abstract record available.
Inventors
- 👤 Thomas G Ackerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:23
CPC Classifications
E; E01; E01F; E01F15/00; E01F15/02; E01F15/04; E01F15/0407; E01F15/0438
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1424395A
Cited
US893815A
Cited
US1814868A
Cited
US1828071A
Cited
US1883879A
Cited
US1895670A
Cited
US2776116A
Cited
CH376535A
Cited
US3390865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-02 | 1973-08-04 | 1974-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-02 | 1977-08-04 | 1978-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-02 | 1981-08-04 | 1982-02-03 | $7700.00 | Window Closed / Lapsed |