US2949658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for forming voids in precast concrete structural members
Assignee: American Marietta Co
•
Filing: 1956-10-03
•
Granted: 1960-08-23
•
Expires: 1976-10-03
Abstract
No abstract record available.
Inventors
- 👤 Nathan A Conn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:04
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/28; B28B7/30; B28B7/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US208483A
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US1605782A
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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) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |