Patent US5163781A successfully refreshed from Google Patents.
US5163781A
Expired / Lapsed
US
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Field construction for a sports or other field
Assignee: Individual
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Filing: 1989-06-16
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Granted: 1992-11-17
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Expires: 2009-06-16
Abstract
Abstract A field construction for sports or other fields is disclosed which includes a substrate or other surface layer and also a filter layer having a pipe network (2,3). The pipe network (2,3) comprises numerous perforated multi-purpose pipes (3) to dry the field and to lead air through the field. In the filter layer (4), the proportion of fine material or material having a granular size of less than 0.06 mm is less than 5%; most advantageously the proportion is less than 1%, so that the filter layer is highly permeable to air, and the substrate includes so much fine material that is less permeable to air.
Inventors
- 👤 Aarne Husu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:10
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/08; E01C13/083
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A field construction for sports or other fields comprising: a substrate or other surface layer, a filter layer beneath said surface layer including fine material substances, said filter layer including a pipe network which includes numerous perforated multi-purpose pipes to dry the field and conduct air through the field, characterized in that the thickness of the filter layer is between 15-25 cm and the thickness of the substrate layer is between 15-25 cm, the multi-purpose pipes are located at a distance of between 1.5-2.5 m from one another, and the specific permeability of the filter layer is at least 2.5 times as great as that of the substrate layer.
Claim 2
Dependent Claim
109 words
A field construction for sports or other fields comprising: a substrate or other surface layer, a filter layer beneath said surface layer including fine material substances, said filter layer including a pipe network which includes numerous perforated multi-purpose pipes to dry the field and conduct air through the field, characterized in that the thickness of the filter layer is between 15-25 cm and the thickness of the substrate layer is between 15-25 cm, the multi-purpose pipes are located at a distance of between 1.5-2.5 m from one another, and the specific permeability of the filter layer is at least 2.5 times as great as that of the substrate layer.
Claim 3
Dependent Claim
41 words
A field construction as in claim 1 characterized in that the proportion of fine material substances of a granular size of less than 0.06 mm in the filter layer is less than 5% to permit a good flow of air therethrough.
Claim 4
Dependent Claim
34 words
A field construction as in claim 2 characterized in that the portion of the fine material substances of a granular size of less than 0.06 mm in the filter layer is less than 1%.
Claim 5
Dependent Claim
25 words
A field construction as in claim 1 characterized in that the multi-purpose pipes are composed of field drain pipes which are covered with fabric mesh.
Claim 6
Dependent Claim
49 words
A field construction as in claim 1 characterized in that the substrate is formed of a separate layer on top of a filter layer, and that the proportion of fine material, having a granular size less than 0.06 mm, of the mass of the substrate, is more than 15%.
Claim 7
Dependent Claim
38 words
A field construction as in claim 1 characterized in that the pipe network located in the filter layer is formed of a network of distribution and multi-purpose pipes in which each multi-purpose pipe crosses several transverse distribution pipes.
Claim 8
Dependent Claim
28 words
A field construction as in claim 1 wherein the specific permeability of the filter layer is 3 to 4 times as great as that of the substrate layer.
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |