Patent US3720529A successfully refreshed from Google Patents.
US3720529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cements
Assignee: Individual
•
Filing: 1970-05-18
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Granted: 1973-03-13
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Expires: 1990-05-18
Abstract
Abstract CEMENTS HAVING A VARIETY OF IMPROVED PROPERTIES INCLUDING REDUCED EFFORESCENCE AND IMPROVED APPEARANCE WHEN MOLDED CAN BE PREPARED BY ADHERING TO A PORTION OF THE SURFACE OF A MAJORITY OF THE UNSET CEMENT PARTICLES A SURFACE-TENSION REDUCING AGENT AND/OR A DISPERSANT WHICH EFFECTS DISPERSION BY ESTABLISHING A COMMON CHARGE ON EACH OF THE CEMENT PARTICLES WITHOUT SUBSTANTIAL REDUCTION IN THE SIZE OF THE PARTICLES. PREFERABLY THE ORGANIC MATTER IS ADHERED TO THE CEMENT PARTICLES BY IMPINGING A STREAM OF ONE OF THE PARTICLES ON A STREAM OF THE OTHER AND PREFERABLY BOTH A SURFACE-TENSION REDUCING AGENT AND A DISPERSANT ARE UTILIZED.
Inventors
- 👤 R Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:29
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |