US3737510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength concrete
Assignee: Asahi Kasei Corp
•
Filing: 1971-03-16
•
Granted: 1973-06-05
•
Expires: 1991-03-16
Abstract
Abstract HOLLOW, CYLINDRICAL, CONCRETE PRODUCTS HAVING A COMPRESSIVE STRENGTH OF AT LEAST 600 KG./CM.2 ARE FORMED FROM SPECIFIED MORTAR MIXTURES OF CEMENT, GROUND SAND HAVING A SPECIFIC SURFACE OF 1000-3000 M.2/G. AND, OPTIONALLY, A SAND HAVING A SPECIFIC SURFACE AREA OF 45-85 CM.2/G. THE MIXTURE IS CAST WITH CENTRIFUGAL FORCE, AND THE RESULTING CASTING IS CURED WITH STEAM UNDER SPECIFIED CONDITIONS.
Inventors
- 👤 M Takaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:45
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/92; C; C04; C04B; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |