US4874425A
Expired / Lapsed
US
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Stable aqueous suspension concentrate compositions
Assignee: Wyeth Holdings LLC
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Filing: 1986-05-23
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Granted: 1989-10-17
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Expires: 2006-05-23
Abstract
Abstract The present invention relates to aqueous suspension concentrate compositions or aqueous flowable compositions containing low-melting pesticides. The compositions of the invention maintain excelleant physical and biological stability.
Inventors
- 👤 Masaomi Kimpara
- 👤 Kaiji Kawai
- 👤 Yukiya Tobe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:30
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/02; A01N25/04; A01N33/00; A01N33/16; A01N33/18; Y; Y02; Y02A; Y02A50/00; Y02A50/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
An aqueous flowable pesticidal concentrate composition comprising, on a weight to weight basis: about 10.0% to 60.0% pendimethalin, in the yellow microcrystalline form; about 1.0% to 10.0% sodium or calcium lignin sulfonate; about 0.05% to 0.5% thickening agent; about 0.1% to 1.0% antiseptic agent; about 0.05% to 1.0% montmorillonite; and the remainder water to total said composition to 100%.
Claim 2
Dependent Claim
59 words
An aqueous flowable pesticidal concentrate composition comprising, on a weight to weight basis: about 10.0% to 60.0% pendimethalin, in the yellow microcrystalline form; about 1.0% to 10.0% sodium or calcium lignin sulfonate; about 0.05% to 0.5% thickening agent; about 0.1% to 1.0% antiseptic agent; about 0.05% to 1.0% montmorillonite; and the remainder water to total said composition to 100%.
Claim 3
Dependent Claim
28 words
A composition according to claim 1 , wherein said pendimethalin has been purified to remove impurities, which lower its melting point, by crystallization, washing, extraction or mixtures thereof.
Claim 4
Dependent Claim
29 words
A composition according to claim 2, wherein said thickening agent is selected from the group consisting of sodium carboxymethyl cellulose, gum arabic, guar gum, sodium alginate or polyvinyl alcohol
Claim 5
Dependent Claim
13 words
A composition according to claim 2, wherein said thickening agent is Xanthan gum.
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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |