US3808740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated seeds and methods
Assignee: Northrup King and Co
•
Filing: 1973-01-08
•
Granted: 1974-05-07
•
Expires: 1993-01-08
Abstract
Abstract Plant seeds, preferably leguminous, are coated with 0.1-5 parts by weight, per 100 parts by weight of seed, of a film forming material and further coated with at least 10 parts by weight (same basis) of solid particles of an agent such as calcium carbonate while the first coat is semi-solid and tacky. The filmforming material preferably comprises a prepolymer curable with water and/or an amine to a water insensitive but permeable solid. One particularly suitable agricultural use for the resulting coated seeds is in the growing of crops in acid soils.
Inventors
- 👤 F Porter
- 👤 H Kaerwer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:20
CPC Classifications
A; A01; A01C; A01C1/00; A01C1/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
116 words
adding to said liquid prepolymer an amount of prepolymer curing agent sufficient to convert said liquid prepolymer to a water permeable, water insoluble resin; c. before the conversion from liquid prepolymer to said water insoluble resin is completed, contacting the thus-coated seeds with 10 to 30 parts by weight, per 100 parts by weight of said seed, of a particulate mass comprising discrete calcium carbonate particles, the major amount of said pArticles being smaller than 150 microns, until individual seeds are provided with an adherent outer layer of said discrete particles, and d. allowing the conversion of the liquid polymer to said resin to be completed after said seeds have been contacted with said particulate mass.
Claim 2
Dependent Claim
35 words
A method according to claim 1 wherein said step (b) is commenced prior to said step (a), but wherein step (a) is commenced before the prepolymer is converted to a gel by the liquid water.
Claim 3
Dependent Claim
28 words
A method according to claim 1 wherein said particulate mass consists essentially of calcium carbonate particles, the major amount of which are less than 150 microns in size.
Claim 4
Dependent Claim
30 words
Method of preparing plant seeds with a multiple coating comprising the steps of: a. feeding said seeds to a coating zone, b. while said seeds are in said coating zone,
Claim 5
Dependent Claim
93 words
A method according to claim 4 comprising the steps of: a. continuously feeding said seeds to a first stage of a two-stage coating zone; b. continuously applying said first coating while said seeds are in said first stage of said coating zone; c. continuously conveying the seeds coated in said first stage of said coating zone to the second stage of said coating zone, and while said seeds are in said second stage, continuously contacting the thus-coated seeds with said particulate mass; d. continuously discharging the resulting coated seeds from said second stage.
Claim 6
Dependent Claim
48 words
A method according to claim 4 wherein said adding of said prepolymer curing agent to said liquid prepolymer is commenced prior to said applying of said first coating, and wherein said applying of said first coating to said seeds is begun before said liquid prepolymer forms a gel.
Claim 7
Dependent Claim
22 words
A method according to claim 4 wherein said liquid prepolymer is an isocyanate-terminated prepolymer and said prepolymer curing agent contains active hydrogen.
Claim 8
Dependent Claim
21 words
A method according to claim 7 wherein said curing agent is selected from the group consisting of water and an amine.
Claim 9
Dependent Claim
31 words
A method according to claim 8 wherein said curing agent is liquid water and the amount of liquid water is greater than the stoichiometric amount needed to cure said liquid prepolymer.
Claim 10
Dependent Claim
13 words
A method according to claim 8 wherein a said curing agent is ketamine.
Claim 11
Dependent Claim
23 words
A method according to claim 10 wherein the resulting polyurea derived from said ketamine and said liquid prepolymer is further cured with water.
Claim 12
Dependent Claim
12 words
A method according to claim 4 wherein said plant seeds are leguminous.
Claim 13
Dependent Claim
13 words
A method according to claim 12 wherein said plant seeds are alfalfa seeds.
Claim 14
Dependent Claim
26 words
A method of growing alfalfa in acid soil comprising: a. coating alfalfa seeds in accordance with claim 4 and b. planting said seeds in acid soil.
Claim 15
Independent Claim
217 words
A method of preparing plant seeds for planting in acid soils comprising the steps of: a. feeding said seeds to the first stage of a two-stage coating zone, conveying said seeds through said first stage, and while said seeds are in said first stage of said coating zone, applying to said seeds a coating composition comprising (1) 0.1-5 parts by weight, per 100 parts by weight of said seeds, of a curable liquid prepolymer dissolved in up to 4 parts by weight, per part of said prepolymer, of an inert liquid organic solvent, and (2) an amount of water or amine sufficient to convert said liquid prepolymer to a solid, water permeable, water insoluble polyurethane or polyurea resin; c. conveying the resulting coated seeds from said first stage to the second stage of said coating zone, and while said seeds are in said second stage, contacting the thus-coated seeds with 10 to 30 parts by weight, per 100 parts by weight of said seed, of a particulate mass comprising discrete calcium carbonate particles, the major amount of said particles being smaller than 150 microns, d. discharging the resulting calcium carbonate-coated seeds from said second stage; and e. allowing the partial curing of said polyurethane or polyurea to be completed after said seeds have left said second stage.
Claim 16
Dependent Claim
102 words
A coated leguminous plant seed having a multiple coating thereon, said coating comprising: a. 0.1-5% by weight, based on the weight of said seeds, of a single porous, water permeable resinous coating comprising a water insoluble and water indispersible polyurethane or polyurea resin firmly adhesively bonded to the outer surfaces of said seed, and b. at least 10% by weight, based on the weight of said seed, of a particulAte coating comprising calcium carbonate particles, said particles coating being adherently bonded to said resinous coating, the major amount by weight of said calcium carbonate particles being less than 150 microns in size.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |