US3057271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cast structural gratings
Assignee: Alcoa Corp
•
Filing: 1957-12-13
•
Granted: 1962-10-09
•
Expires: 1977-12-13
Abstract
No abstract record available.
Inventors
- 👤 William R Butler
- 👤 George L Moore
- 👤 Wayne C Keith
- 👤 Jr Frederick D Sanborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/42; E04C2/427
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |