US3463456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railing construction
Assignee: Walker Iron Works Inc
•
Filing: 1968-01-25
•
Granted: 1969-08-26
•
Expires: 1988-01-25
Abstract
No abstract record available.
Inventors
- 👤 James Henry Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:17
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/18; E04F11/181
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2655345A
Cited
US2723107A
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US3101929A
Cited
US3246879A
Cited
US3315943A
Cited
US3305221A
Cited
US3385567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |