US2677957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed concrete structure
Assignee: RAYMOND CONCRETE PILE CO
•
Filing: 1952-06-12
•
Granted: 1954-05-11
•
Expires: 1972-06-12
Abstract
No abstract record available.
Inventors
- 👤 Maxwell M Upson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:11
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; E04C5/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1987794A
Cited
US2086152A
Cited
US2270240A
Cited
GB541437A
Cited
US2413990A
Cited
US2378584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-10 | 1957-11-09 | 1958-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-10 | 1961-11-09 | 1962-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-10 | 1965-11-09 | 1966-05-11 | $7700.00 | Window Closed / Lapsed |