US2871099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous production of hydrogels containing silicic acid
Assignee: BASF SE
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Filing: 1956-02-01
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Granted: 1959-01-27
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Expires: 1976-02-01
Abstract
No abstract record available.
Inventors
- 👤 Ziese Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:21
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0069; B01J20/00; B01J20/02; B01J20/10; B01J20/103; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN THE PROCESS FOR CONTINOUSLY PRODUCING ELASTIC HYDROGELS CONTAINING SILICIC ACID FROM ALKALI SILICATES AND INORGANIC ACIDS WITH THE IANTERMEDIATE FORMATION OF AN UNSTABLE SOL CONTAINING SILICIC ACID THE STEPS WHICH COMPRISE DIVIDING THE SOL CONTAING SILICIC ACID INTO INDIVIDUAL STREAMS OF THE SL SHICH TSTREAMS HAVE A VROSS-SECTION UP TO ABOUT 70 MILLMETRES AND ARE HEATED TO ABOUT 40* UP TO ABOUT 100*C. WHILST BEING LED THROUGH TUBES HAVING A SMOOTH INNER SURFACE IN SUCH MANNER THAT THE SOL IS SOLIDIFIED DURING ITS PASSAGE THROUGH SAID TUBES TO THE HYDROGEL AND REMOVING THE HYDROGEL IN THE FROM OF THE RESULTANT RODS FROM SAID TUBES.
Claim 2
Dependent Claim
105 words
IN THE PROCESS FOR CONTINOUSLY PRODUCING ELASTIC HYDROGELS CONTAINING SILICIC ACID FROM ALKALI SILICATES AND INORGANIC ACIDS WITH THE IANTERMEDIATE FORMATION OF AN UNSTABLE SOL CONTAINING SILICIC ACID THE STEPS WHICH COMPRISE DIVIDING THE SOL CONTAING SILICIC ACID INTO INDIVIDUAL STREAMS OF THE SL SHICH TSTREAMS HAVE A VROSS-SECTION UP TO ABOUT 70 MILLMETRES AND ARE HEATED TO ABOUT 40* UP TO ABOUT 100*C. WHILST BEING LED THROUGH TUBES HAVING A SMOOTH INNER SURFACE IN SUCH MANNER THAT THE SOL IS SOLIDIFIED DURING ITS PASSAGE THROUGH SAID TUBES TO THE HYDROGEL AND REMOVING THE HYDROGEL IN THE FROM OF THE RESULTANT RODS FROM SAID TUBES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |