US2748935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating talc and asbestos
Assignee: Eternit Werke Ludwig Hatschek AG
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Filing: 1951-09-17
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Granted: 1956-06-05
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Expires: 1971-09-17
Abstract
No abstract record available.
Inventors
- 👤 Rescheneder Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:00
CPC Classifications
B; B03; B03D; B03D1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PROCESS FOR SEPARATING TALC FROM ASBESTOS FIBRES HAVING SMALL AMOUNTS OF TALC ADMIXED THEREWITH COMPRISING TREATING SAID ASBESTOS WITH A NON-ACIDIC COLLOIDAL SOLUTION OF A SURFACE ACTIVE SUBSTANCE SELECTED FROM THE GROUP CAPABLE OF FORMING HYDROPHILIC PRECIPITATES ON THE BOUNDARY SURFACES THEREBY RENDERING THE TALC CAPABLE OF BEING WETTED.
Claim 2
Dependent Claim
50 words
A PROCESS FOR SEPARATING TALC FROM ASBESTOS FIBRES HAVING SMALL AMOUNTS OF TALC ADMIXED THEREWITH COMPRISING TREATING SAID ASBESTOS WITH A NON-ACIDIC COLLOIDAL SOLUTION OF A SURFACE ACTIVE SUBSTANCE SELECTED FROM THE GROUP CAPABLE OF FORMING HYDROPHILIC PRECIPITATES ON THE BOUNDARY SURFACES THEREBY RENDERING THE TALC CAPABLE OF BEING WETTED.
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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |