Patent US4148623A successfully refreshed from Google Patents.
US4148623A
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Controlled release fertilizer
Assignee: International Standard Electric Corp
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Filing: 1977-11-22
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Granted: 1979-04-10
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Expires: 1997-11-22
Abstract
Abstract A nitrogen containing slow release glass fertilizer is prepared by co-melting phosphorus oxynitride with phosphorus pentoxide, an alkaline metal oxide and an oxide of a metal of Group II or Group III of the periodic table.
Inventors
- 👤 Cyril F. Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:30
CPC Classifications
C; C05; C05B; C05B17/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
A controlled release fertilizer composition comprising a water soluble glass containing phosphorus oxynitride together with an alkali metal oxide, phosphorus pentoxide and an oxide of a metal of Group II or III of the periodic table.
Claim 2
Dependent Claim
36 words
A controlled release fertilizer composition comprising a water soluble glass containing phosphorus oxynitride together with an alkali metal oxide, phosphorus pentoxide and an oxide of a metal of Group II or III of the periodic table.
Claim 3
Dependent Claim
15 words
The fertilizer composition of claim 1, in which the alkali metal oxide is potassium oxide.
Claim 4
Dependent Claim
21 words
The fertilizer composition of claim 1, in which the oxide of a metal of Group II or III is calcium oxide.
Claim 5
Dependent Claim
19 words
The fertilizer composition of claim 1, containing a total of not more than 1 wt. % of trace elements.
Claim 6
Dependent Claim
8 words
The fertilizer composition of claim 1 containing silica.
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) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |