US3697567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of dissolved organic lead from aqueous alkyllead process effluents
Assignee: EIDP Inc
•
Filing: 1971-03-24
•
Granted: 1972-10-10
•
Expires: 1991-03-24
Abstract
Abstract Process of removing dissolved organic lead from an aqueous effluent produced in the manufacture of alkyllead compounds by contacting a metal more electropositive than lead but essentially non-reactive with water with the effluent until the dissolved organic lead is converted to an insoluble lead-containing product, leaving a reduced dissolved organic lead content in the effluent.
Inventors
- 👤 Earl Richard Taylor Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:05
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/70; C02F1/705; C07; C07F; C07F7/00; C07F7/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
The process of claim 1 wherein the metal is selected from the group consisting of iron, zinc, aluminum and magnesium.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein the effluent being contacted has a pH of 8 to 13.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the metal is zinc.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein the effluent is from a process for making tetra (mixed alkyl) lead by redistributing the alkyl groups of a mixture of tetra-methyllead and tetraethyllead.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein the metal is aluminum.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein the metal is iron.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |