US3022713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed concrete structures
Assignee: Individual
•
Filing: 1954-11-26
•
Granted: 1962-02-27
•
Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Bengt F Friberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:47
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; E04C5/12; E04C5/125; E01; E01C; E01C7/00; E01C7/08; E01C7/10; E01C7/14; E01C7/16
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) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |