Patent US4539038A successfully refreshed from Google Patents.
US4539038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device ensuring permanent nutrition of pot plants
Assignee: Airwick AG
•
Filing: 1983-04-25
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Granted: 1985-09-03
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Expires: 2003-04-25
Abstract
Abstract Device for the permanent nutrition of pot plants and containing a granulated slow-release fertilizer comprising at least one fertilizing element selected from nitrogen, phosphorus and potassium, consisting of a flat support, on the upper surface of which adhere the granules, and a water-permeable sheet covering the flat support so as to enclose the granules.
Inventors
- 👤 Jean-Marie Gombert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:47
CPC Classifications
A; A01; A01G; A01G27/00; A01G27/04; A01G24/00; A01G24/10; A01G24/20; A01G24/30; A01G24/40; A01G24/42; A01G24/44; A01G24/50; Y; Y02; Y02P; Y02P60/00; Y02P60/20; Y02P60/21; Y10; Y10S; Y10S71/00; Y10S71/904
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
52 words
A plant feeding device comprising a flat support, at least one granulated slow-release fertilising element selected from the group consisting of nitrogen, phosphorus and potassium releasing materials adhered to the upper face of said support and a water-permeable sheet covering the granules and the flat support so that the granules are enveloped.
Claim 2
Dependent Claim
52 words
A plant feeding device comprising a flat support, at least one granulated slow-release fertilising element selected from the group consisting of nitrogen, phosphorus and potassium releasing materials adhered to the upper face of said support and a water-permeable sheet covering the granules and the flat support so that the granules are enveloped.
Claim 3
Dependent Claim
27 words
Device according to claim 1 characterized in that the granulated slow-release fertiliser consists of a water-soluble fertiliser nucleus surrounded by a barrier only slightly permeable to water.
Claim 4
Dependent Claim
52 words
Device according to claim 2 characterized in that the water-soluble fertiliser contains at least one fertilising composition selected from the group consisting of urea and its soluble derivatives; alkali and ammonium salts formed from nitric acid or phosphoric acid, and ammonium and potassium salts formed from agriculturally acceptable acids or precursors thereof.
Claim 5
Dependent Claim
39 words
Device according to claim 2 characterized in that the barrier is selected from synthetic homopolymers and copolymers, natural hydrophobic products, elemental sulphur and compositions containing it and materials used in the pharmaceutical industry for producing implants and enteric pills.
Claim 6
Dependent Claim
34 words
Device according to claim 1 characterized in that the granulated slow-release fertiliser consists of one or more substances which are insoluble in water but which degrade slowly in contact with it, in water-soluble substances.
Claim 7
Dependent Claim
39 words
Device according to claim 5 characterized in that the insoluble substance is selected from the group consisting of cyanuramide, ammoniated Leonardite, metallic ammonium phosphates, phosphazenes and substantially polymerized compositions formed from urea and formaldehyde, acetaldehyde, isobutyraldehyde, crotonaldehyde or glyoxal.
Claim 8
Dependent Claim
33 words
Device according to claim 1 characterized in that the permeable sheet is selected from papers, felts non-woven fabrics, tissues, natural or synthetic sponges, fused polymers, and perforated films of plastomeric or elastomeric material.
Claim 9
Dependent Claim
36 words
Device according to claim 7 characterized in that the permeable sheet is a non-woven fabric selected from normal voile or voile reinforced by fibres obtained by the dry or wet method, and those produced by aiguilletage.
Claim 10
Dependent Claim
39 words
Device according to claim 1 characterized in that the flat support is selected from papers, felts, non-woven fabrics, tissues, natural or synthetic sponges, fused polymers, films of plastomeric or elastomeric materials, aluminium and pasteboard coated with a hydrophobic covering.
Claim 11
Dependent Claim
24 words
Device according to claim 9 characterized in that the flat support is impermeable and rigid and has, on its circumference, an upwardly directed rim.
Claim 12
Dependent Claim
21 words
Device according to claim 1 characterized in that the granules are fixed on the flat support by means of an adhesive.
Claim 13
Dependent Claim
22 words
Device according to claim 1 characterized in that the permeable sheet is fixed on the fertiliser granules by means of an adhesive.
Claim 14
Dependent Claim
47 words
Device according to either claim 11 or claim 12 characterized in that the adhesive is selected from natural sizes and glues, animal and vegetable proteins, gelatines, albumins, caseins, sugars, polysaccharides, asphalts, waxes, paraffins, natural or synthetic rubbers, sodium silicate and synthetic homopolymeric or copolymeric waxes and resins.
Claim 15
Dependent Claim
12 words
Device according to claim 13 characterized in that the adhesive is water-soluble.
Claim 16
Dependent Claim
23 words
Device according to claim 1 characterized in that the permeable sheet is fixed, by its circumference, on the circumference of the flat support.
Claim 17
Dependent Claim
34 words
Device according to claim 1 characterized in that it comprises slow-release granules other than the fertiliser and selected from those containing one or more of trace elements, algicides, fungicides, insecticides, nematocides and growth regulators.
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |