US3707443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Montmorillonite clays as aids in steam distillation of tetraalkyllead
Assignee: PPG Industries Inc
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Filing: 1970-07-02
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Granted: 1972-12-26
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Expires: 1990-07-02
Abstract
Abstract A METHOD OF DISPERSING LEAD PARTICULATES PRESENT IN A REACTION MASS UNDERGOING STEAM DISTILLATION IS DESCRIBED. IN PARTICULAR THE REACTION MASS CONTAINS TETRAALKYLLEADS, SOLID LEAD PARTICULATES, SODIUM HALES AND WATER. THIS MASS IS SUBJECTED TO STEAM DISTILLATION AND CONTROLLED DURING DISTILLATION TO MAINTAIN THEREIN A MONTMORILLONITE CLAY IN QUANTITIES REPRESENTING AT LEAST 0.0001 POUND OF CLAY PER POUND OF LEAD PARTICLES PRESENT. CLAYS OF PARTICULAR NOTE MENTIONED IN THE SPECIFICATION ARE BENTONITE CLAYS AND FULLER''S EARTH.
Inventors
- 👤 Thorowgood T Broun Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:22
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/24; B; B01; B01D; B01D3/00; B01D3/34; B01D3/38
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |