Patent US3688437A successfully refreshed from Google Patents.
US3688437A
Expired / Lapsed
US
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Pellets in the form of foamed bodies, and methods for the preparation thereof
Assignee: Forenode Superfosfatfabrika AB
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Filing: 1971-01-22
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Granted: 1972-09-05
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Expires: 1991-01-22
Abstract
Abstract A method for covering and enlarging individual seeds by a chemical process, comprising the steps of introducing said seeds into a first solution containing at least one gelatinizable compound and a catalyst for the decomposition of a further compound capable of giving off a gas, and then introducing the seeds thus treated into a second solution containing at least one salt causing gelatinization of said gelatinizable compound and said further compound for the simultaneous evolution of gas for inflating the individual seeds to foamed bodies.
Inventors
- 👤 Bjorn Staffan Artur Hamrin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:59
CPC Classifications
A; A01; A01C; A01C1/00; A01C1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
40 words
A method according to claim 1 wherein the seeds coated with said solution are dropped through a plurality of openings provided at the bottom of said first zone, said openings having a diameter of 1-3 mm, into the precipitation bath.
Claim 2
Dependent Claim
22 words
A method according to claim 1 wherein said first zone contains gelatin, a solution of a soluble alginate salt, and said catalyst.
Claim 3
Dependent Claim
50 words
A method according to claim 1 wherein said solution in said first zone contains 0.5-2 percent gelatin, 0.5-1 percent agAr-agar, the substance capable of being converted into an insoluble substance is sodium alginate in an amount of 0.5-2percent 2 the catalyst is manganese dioxide in an amount of 0.01-0.05 percent.
Claim 4
Dependent Claim
38 words
A method according to claim 1 wherein in the precipitation bath, the precipitant is calcium nitrate in an amount of 5-15 percent and the substance capable of generating gas is hydrogen peroxide in an amount of 0.5-1.5 percent.
Claim 5
Dependent Claim
22 words
A method according to claim 1 wherein the seeds are transferred from said first zone to said precipitation bath one by one.
Claim 6
Dependent Claim
28 words
A porous pellet comprised of a spherical foamed body within which at least one seed is encapsulated in a network of at least one water-insoluble substance and gelatin.
Claim 7
Dependent Claim
13 words
A pellet according to claim 7 wherein said water-insoluble substance is calcium alginate.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |