US2696040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for prestressing
Assignee: Preload Co Inc
•
Filing: 1950-09-15
•
Granted: 1954-12-07
•
Expires: 1970-09-15
Abstract
No abstract record available.
Inventors
- 👤 John M Crom
- 👤 Crom Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:28
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; E04G21/121; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49616; Y10T29/49623; Y10T29/49632; Y10T29/49826; Y10T29/49863; Y10T29/49874; Y10T29/49947; Y10T29/49959; Y10T29/53; Y10T29/53796; Y10T29/5383
Claims Analysis
Total Claims: 0
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US2516020A
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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) | 1957-12-06 | 1958-06-07 | 1958-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-06 | 1962-06-07 | 1962-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-06 | 1966-06-07 | 1966-12-07 | $7700.00 | Window Closed / Lapsed |