Patent US4063919A successfully refreshed from Google Patents.
US4063919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fertilizer rods
Assignee: Air Products and Chemicals Inc
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Filing: 1976-06-17
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Granted: 1977-12-20
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Expires: 1996-06-17
Abstract
Abstract The invention relates to a fertilizer rod composition comprising about 100 parts of a polyvinyl alcohol, about 0 to 20 parts of a plasticizer and about 10 to 350 parts of a fertilizer, a process for producing said rod and a product of said process.
Inventors
- 👤 Joseph Grano, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:20
CPC Classifications
C; C05; C05G; C05G5/00; C05G5/10; C05G5/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A fertilizer rod composition comprising: A. about 100 parts by weight of a water soluble polyvinyl alcohol polymer, B. about 0 to 20 parts by weight of a plasticizer for said polyvinyl alcohol, and C. about 10 to 350 parts by weight of a fertilizer, said composition being an uniform blend of (A), (B) and (C), or (A) and (C) when (B) is 0 bonded in the form of a rod by (A) as a matrix phase, said rod being water soluble.
Claim 2
Dependent Claim
82 words
A fertilizer rod composition comprising: A. about 100 parts by weight of a water soluble polyvinyl alcohol polymer, B. about 0 to 20 parts by weight of a plasticizer for said polyvinyl alcohol, and C. about 10 to 350 parts by weight of a fertilizer, said composition being an uniform blend of (A), (B) and (C), or (A) and (C) when (B) is 0 bonded in the form of a rod by (A) as a matrix phase, said rod being water soluble.
Claim 3
Dependent Claim
25 words
A composition of claim 1, wherein said polyvinyl alcohol is a hydrolyzed polyvinyl acetate containing 0 to 45 percent by weight of residual polyvinyl acetate.
Claim 4
Dependent Claim
19 words
A composition of claim 1, wherein said polyvinyl alcohol has a molecular weight ranging from about 5,000 to 150,000.
Claim 5
Dependent Claim
26 words
A composition of claim 1, wherein said polyvinyl alcohol has a viscosity of 4 to 65 cps based on 4 percent aqueous solution at 20° C.
Claim 6
Dependent Claim
12 words
A composition of claim 1, wherein said plasticizer is a polyhydric alcohol.
Claim 7
Dependent Claim
29 words
A composition of claim 1, wherein said polyhydric alcohol is selected from the group consisting of glycerine, sorbitol, glycol, polyglycols having 4 to 20 carbon atoms and mixtures thereof.
Claim 8
Dependent Claim
19 words
A composition of claim 1, wherein said fertilizer is a granular solid having mesh size of 5 to 400.
Claim 9
Dependent Claim
33 words
A composition of claim 1, wherein said fertilizer is a plant food having available water soluble compounds having elements selected from the group consisting of nitrogen, calcium, phosphorous and potassium or mixtures thereof.
Claim 10
Independent Claim
79 words
A method for preparing fertilizer rods comprising the steps: A. dry blending about 100 parts by weight of a granular polyvinyl alcohol with about 0 to 20 parts by weight of a plasticizer forming a first dry blend, B. mixing said first dry blend with from about 10 to 350 parts by weight of a fertilizer to form a second dry blend followed by, C. melt extruding said second dry blend through a profile die forming a fertilizer rod.
Claim 11
Independent Claim
79 words
A method for preparing fertilizer rods comprising the steps: A. dry blending about 100 parts by weight of a granular polyvinyl alcohol with about 0 to 20 parts by weight of a plasticizer forming a first dry blend, B. mixing said first dry blend with from about 10 to 350 parts by weight of a fertilizer to form a second dry blend followed by, C. melt extruding said second dry blend through a profile die forming a fertilizer rod.
Claim 12
Dependent Claim
36 words
A process of claim 9, wherein said melt extrusion is carried out at temperatures of from about 65° to 185° C., through a die under a pressure of 1,000 to 3,500 psi forming a fertilizer rod.
Claim 13
Dependent Claim
26 words
A process of claim 9, wherein said polyvinyl alcohol is a hydrolyzed polyvinyl acetate containing 0 to 45 percent by weight of a residual polyvinyl acetate.
Claim 14
Dependent Claim
19 words
A process of claim 9, wherein said polyvinyl alcohol has a molecular weight ranging from about 5,000 to 150,000.
Claim 15
Dependent Claim
26 words
A process of claim 9, wherein said polyvinyl alcohol has a viscosity of 4 to 65 cps based on 4 percent aqueous solution at 20° C.
Claim 16
Dependent Claim
12 words
A process of claim 9, wherein said plasticizer is a polyhydric alcohol.
Claim 17
Dependent Claim
29 words
A process of claim 9, wherein said polyhydric alcohol is selected from the group consisting of glycerine, sorbitol, glycol, polyglycols having 4 to 20 carbon atoms and mixtures thereof.
Claim 18
Dependent Claim
10 words
A fertilizer rod produced by the process of claim 9.
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) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |