Patent US4184866A successfully refreshed from Google Patents.
US4184866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sustained release pesticide compositions and process for making same
Assignee: Westvaco Corp
•
Filing: 1975-05-28
•
Granted: 1980-01-22
•
Expires: 1995-05-28
Abstract
Abstract A sustained release composition is disclosed which provides an improved carrier for an organic pesticide. The improved carrier is a reversibly swellable lignin gel made by cross-linking an alkali lignin with epichlorohydrin using particular conditions.
Inventors
- 👤 Humbert T. Dellicolli
- 👤 Peter Dilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:41
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/08; A01N25/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
In a controlled release herbicide composition comprising, a herbicide physically dispersed throughout a modified lignin gel carrier, said herbicide being continually released under environmental conditions to generate an effective amount of herbicide, the weight ratio of herbicide-to-lignin gel carrier being from 0.01:1 to 1:1, the improvement residing in the lignin carrier which comprises, reacting an aqueous solution of alkali lignin at a solids concentration of between 10% and 25% by volume with from 1 to 5 moles of epichlorohydrin at a temperature between 80° C. and 95° C. for from 5 minutes to 2 hours to form a cross-linked, reversibly swellable lignin gel.
Claim 2
Dependent Claim
103 words
In a controlled release herbicide composition comprising, a herbicide physically dispersed throughout a modified lignin gel carrier, said herbicide being continually released under environmental conditions to generate an effective amount of herbicide, the weight ratio of herbicide-to-lignin gel carrier being from 0.01:1 to 1:1, the improvement residing in the lignin carrier which comprises, reacting an aqueous solution of alkali lignin at a solids concentration of between 10% and 25% by volume with from 1 to 5 moles of epichlorohydrin at a temperature between 80° C. and 95° C. for from 5 minutes to 2 hours to form a cross-linked, reversibly swellable lignin gel.
Claim 3
Dependent Claim
14 words
The composition of claim 1 wherein said lignin carrier is made from kraft lignin.
References Cited (Backward Citations)
US3813236A
Cited
US3985540A
Cited
US3900378A
Cited
US3806485A
Cited
US3929453A
Cited
US3886101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |