Patent US4726143A successfully refreshed from Google Patents.
US4726143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Root fertilizing device
Assignee: Individual
•
Filing: 1987-03-24
•
Granted: 1988-02-23
•
Expires: 2007-03-24
Abstract
Abstract The device is a cylindrical housing enclosing a spaced apart cylindrical receptacle for fertilizer. Metering rings channel rain water towards the fertilizer but prevent fertilizer from exiting the top of the housing. End grates enclose the open ends of the housing, the top grate containing a water permeable filter to prevent clogging of the device by foreign debris.
Inventors
- 👤 John Steinbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:37
CPC Classifications
A; A01; A01G; A01G29/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
225 words
An underground root fertilizing device comprising: (a) an outer cylindrical housing having an exterior face and inner face, the housing being open at a top end and at a bottom end, (b) means mounting an inner cylindrical receptacle within but spaced apart from the inner face of the housing, the receptacle having an exterior and inner wall surface with a plurality of notches, the notches extending through the wall of the receptacle at first and second open ends of the cylindrical receptacle, (c) a top metering ring mounted around the first open end of the receptacle, a top surface of the top metering ring tapering in a downward direction from the inner face of the housing, (d) a bottom planar metering ring mounted around the second open end of the receptacle, (e) a top grate having a top and bottom surface with a plurality of holes through the grate and a water permeable filter covering the bottom surface of the grate, the top grate enclosing the open top end of the housing, (f) a bottom grate having a plurality of holes adjacent an outer edge of the bottom grate, the bottom grate enclosing the open bottom end of the housing, and (g) means removably connecting the top grate to the open top, whereby the receptacle can be filled with fertilizer by removing the top grate.
Claim 2
Dependent Claim
225 words
An underground root fertilizing device comprising: (a) an outer cylindrical housing having an exterior face and inner face, the housing being open at a top end and at a bottom end, (b) means mounting an inner cylindrical receptacle within but spaced apart from the inner face of the housing, the receptacle having an exterior and inner wall surface with a plurality of notches, the notches extending through the wall of the receptacle at first and second open ends of the cylindrical receptacle, (c) a top metering ring mounted around the first open end of the receptacle, a top surface of the top metering ring tapering in a downward direction from the inner face of the housing, (d) a bottom planar metering ring mounted around the second open end of the receptacle, (e) a top grate having a top and bottom surface with a plurality of holes through the grate and a water permeable filter covering the bottom surface of the grate, the top grate enclosing the open top end of the housing, (f) a bottom grate having a plurality of holes adjacent an outer edge of the bottom grate, the bottom grate enclosing the open bottom end of the housing, and (g) means removably connecting the top grate to the open top, whereby the receptacle can be filled with fertilizer by removing the top grate.
Claim 3
Dependent Claim
39 words
The underground root fertilizing device according to claim 1 wherein the device is inserted into a vertical hole in soil under the drip line of a tree with the top grate substantially flush with the surface of the soil.
Claim 4
Dependent Claim
42 words
The underground root fertilizing device according to claim 1 wherein the device is inserted into a vertical hole through a concrete body under the drip line of a tree with the top grate substantially flush with the surface of the surrounding concrete.
Claim 5
Dependent Claim
24 words
The underground root fertilizing device according to claim 1 wherein the housing, receptacle, spacer rings and grates are made from a high strength polymer.
Claim 6
Dependent Claim
23 words
The underground root fertilizing device according to claim 1 wherein the housing, receptacle, metering rings and grates are made from a polyvinylchloride polymer.
Claim 7
Dependent Claim
23 words
The underground root fertilizing device according to claim 1 wherein the housing receptable, spacer rings and grates are made from a polyacrylic polymer.
Claim 8
Dependent Claim
21 words
The underground root fertilizing device according to claim 1 wherein the metering rings have multiple through holes adjacent an outer edge.
Claim 9
Dependent Claim
19 words
The underground root fertilizing device according to claim 1 wherein a core of the bottom grate is solid polymer.
References Cited (Backward Citations)
US349874A
Cited
US1194027A
Cited
US1280486A
Cited
US2791347A
Cited
US3060012A
Cited
US3319379A
Cited
US3460562A
Cited
US3755966A
Cited
NL8302998A
Cited
DE3523099A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |