US2708780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Form for concrete structure
Assignee: Individual
•
Filing: 1954-03-24
•
Granted: 1955-05-24
•
Expires: 1974-03-24
Abstract
No abstract record available.
Inventors
- 👤 Norton R Burkhalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:38
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/22; E; E01; E01D; E01D21/00; E01D2101/00; E01D2101/20; E01D2101/24; E01D2101/26
Claims Analysis
Total Claims: 0
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US2558615A
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US2610381A
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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) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |