US4501420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Playing surfaces sports
Assignee: Nottinghamshire Sports and Safety Systems Ltd
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Filing: 1983-04-25
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Granted: 1985-02-26
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Expires: 2003-04-25
Abstract
Abstract A method of constructing a playing surface for sports such as soccer, cricket and tennis is disclosed, comprising the steps of laying one or more flexible water-permeable envelopes containing an unbonded base material comprising sand on a drained or water-permeable surface, and placing a sheet of resilient material on to the envelope. In a preferred embodiment, a second sheet of resilient material having different bounce characteristics from the first is placed on the first sheet, and an artificial turf material is laid on top.
Inventors
- 👤 Peter L. K. Dury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:49
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/02; E01C13/04; E01C13/045; E01C13/08; E01C3/00; E01C3/006; Y; Y10; Y10S; Y10S273/00; Y10S273/13
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
58 words
A method of constructing a playing surface for sports and the like, characterised by the steps of: (A) laying on a drained or water-permeable surface at least one envelope formed of a flexible water-permeable material and containing an unbonded base material comprising sand; and (B) placing on to said envelope or envelopes a sheet of a resilient material.
Claim 2
Independent Claim
58 words
A method of constructing a playing surface for sports and the like, characterised by the steps of: (A) laying on a drained or water-permeable surface at least one envelope formed of a flexible water-permeable material and containing an unbonded base material comprising sand; and (B) placing on to said envelope or envelopes a sheet of a resilient material.
Claim 3
Dependent Claim
27 words
A method according to claim 1, wherein step (A) comprises laying a plurality of said envelopes so that the envelopes butt together to form a continuous layer.
Claim 4
Dependent Claim
19 words
A method according to claim 1, wherein said sheet of resilient material is formed from rubber particles bonded together.
Claim 5
Dependent Claim
16 words
A method according to claim 1, wherein said sheet of resilient material comprises dense expanded polyethylene.
Claim 6
Dependent Claim
32 words
A method according to claim 1, comprising placing a second sheet of resilient material on said sheet of resilient material, said second sheet having a different stiffness and/or resilience from the first.
Claim 7
Dependent Claim
21 words
A method according to claim 5, comprising laying on to said second sheet of resilient material a synthetic playing surface material.
Claim 8
Dependent Claim
20 words
A method according to claim 5, comprising laying on to said second sheet of resilient material a synthetic turf material.
Claim 9
Dependent Claim
17 words
A method according to claim 1, comprising laying on to said resilient material a synthetic playing surface.
Claim 10
Dependent Claim
17 words
A method according to claim 1, comprising laying on to said resilient material a synthetic turf material.
Claim 11
Dependent Claim
25 words
A method according to claim 1, wherein the thickness of said base material in the envelope or envelopes is from 12 mm to 75 mm.
Claim 12
Dependent Claim
29 words
A method according to claim 1, wherein the sizes of the envelopes are from 2 m wide and 7 m long to 4 m wide and 20 m long.
Claim 13
Dependent Claim
13 words
A method according to claim 1, wherein said base material also contains gravel.
Claim 14
Dependent Claim
13 words
A method according to claim 12, wherein said base material also contains clay.
Claim 15
Dependent Claim
13 words
A method according to claim 1, wherein said base material also contains clay.
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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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |