US2803868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuous prestressing of articles
Assignee: Preload Co Inc
•
Filing: 1954-09-14
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Granted: 1957-08-27
•
Expires: 1974-09-14
Abstract
No abstract record available.
Inventors
- 👤 Dobell Curzon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:47
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; B; B28; B28B; B28B23/00; B28B23/02; B28B23/04; B28B23/12; E04G2021/127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |