US3560230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Set retarded portland cement composition
Assignee: WR Grace and Co
•
Filing: 1969-01-08
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Granted: 1971-02-02
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Expires: 1989-01-08
Abstract
Abstract THE SETTING TIME OF HYDRAULIC CEMENT COMPOSITIONS (E.G. PORTLAND CEMENT CONCRETE) IS RETARDED BY THE ADDITION OF N,N-DIMETHYLOIDIHYDROXYETHYLENEUREA TO THE COMPOSITION.
Inventors
- 👤 Robert W Previte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:19
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/12; C04B24/126
Claims Analysis
Total Claims: 0
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |