Patent US2742345A successfully refreshed from Google Patents.
US2742345A
Expired / Lapsed
US
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Process for the production of finely divided silicates of low density
Assignee: Evonik Operations GmbH
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Filing: 1954-07-09
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Granted: 1956-04-17
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Expires: 1974-07-09
Abstract
No abstract record available.
Inventors
- 👤 Kloepfer Harry
- 👤 Frey Artur
- 👤 Weitbrecht Gerhard
- 👤 Kohl Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:03
CPC Classifications
C; C10; C10M; C10M5/00; A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/25; A61K9/00; A61K9/20; A61K9/2004; A61K9/2009; A61Q; A61Q11/00; C01; C01B; C01B33/00; C01B33/20; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/131; C08; C08K; C08K3/00; C08K3/34; C08K3/346; C08K9/00; C08K9/02; C10M2201/00; C10M2201/06; C10M2201/062; C10M2201/10; C10M2201/102; C10M2201/103; C10N; C10N2010/00; C10N2010/04; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A PROCESS FOR CONVERTING A BENTONITE WHICH IS SWELLABLE IN WATER INTO A FINELY DIVIDED PRODUCT OF LOW BULK DENSITY WHICH COMPRISES AUTOCLAVING AN AQUEOUS SUSPENSION OF SUCH BENTONITE WITH CALCIUM HYDROXIDE AT A TEMPERATURE BETWEEN 150 AND 250* C. TO EFFECT A REACTION BETWEEN THE SUSPENDED BENTONITE AND THE CALCIUM HYDROXIDE.
Claim 2
Dependent Claim
52 words
A PROCESS FOR CONVERTING A BENTONITE WHICH IS SWELLABLE IN WATER INTO A FINELY DIVIDED PRODUCT OF LOW BULK DENSITY WHICH COMPRISES AUTOCLAVING AN AQUEOUS SUSPENSION OF SUCH BENTONITE WITH CALCIUM HYDROXIDE AT A TEMPERATURE BETWEEN 150 AND 250* C. TO EFFECT A REACTION BETWEEN THE SUSPENDED BENTONITE AND THE CALCIUM HYDROXIDE.
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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |