Patent US3753902A successfully refreshed from Google Patents.
US3753902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filterability of water suspended masses
Assignee: Sandoz AG
•
Filing: 1970-07-02
•
Granted: 1973-08-21
•
Expires: 1990-07-02
Abstract
Abstract WATER SUSPENDED INORGANIC MASSES, ESPECIALLY CEMENT SLURRIES, OF IMPROVED FILTRABILITY, OBTAINED ADDING THERETO CATION ACTIV%E POLYMIDES AND/OR POLYAMIDAMINES, GUANIDINE DERIVATIVES AS IN U.S. PATENT APPLICATION NO. 812,441 AND OPTIONALLY CA(OH)2-.
Inventors
- 👤 H Stettler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:59
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/38; C04B7/40; B; B01; B01J; B01J20/00; B01J20/22; B01J47/00; B01J47/016
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |