US3377053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guard rail structures for highways
Assignee: MILTON F WALLING
•
Filing: 1966-05-16
•
Granted: 1968-04-09
•
Expires: 1986-05-16
Abstract
No abstract record available.
Inventors
- 👤 Harold D Burdett
- 👤 Milton F Walling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:55
CPC Classifications
E; E01; E01F; E01F15/00; E01F15/02; E01F15/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US953060A
Cited
US1711898A
Cited
US1718877A
Cited
US1921129A
Cited
US2005418A
Cited
US2163809A
Cited
US3193255A
Cited
FR1358973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |