Patent US4492728A successfully refreshed from Google Patents.
US4492728A
Expired / Lapsed
US
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Sports ground covering with expanded clay particles
Assignee: Individual
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Filing: 1983-02-22
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Granted: 1985-01-08
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Expires: 2003-02-22
Abstract
Abstract The covering has a lower or cushioning layer (1) and an upper or wear-resisting coating (2), between which there is a reinforcing iron netting (3). Both the layers contain rubber chips (4), which are produced from old vehicle tires. The lower layer used for cushioning impact effects on the covering, is additionally provided with spherical expanded clay (5), which gives said layer a particular elasticity and also makes it independent of atmospheric humidity during production.
Inventors
- 👤 Pierre Zurkinden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:47
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/06; E01C13/065; D; D06; D06N; D06N7/00; D06N7/0094; D06N2203/00; D06N2203/06; D06N2203/068; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/31826; Y10T428/3183; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/109; Y10T442/124
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
60 words
A sports ground covering comprising a lower layer (1) for cushioning or damping impact effects on the covering, an upper wear-resisting coating (2) applied thereto and an intermediate reinforcing netting (3) for stabilizing the cushioning layer (1), the two layers (1, 2) containing rubber chips (4) bound with polyurethane, said lower layer (1) also containing expanded clay (5) interspersed therein.
Claim 2
Dependent Claim
60 words
A sports ground covering comprising a lower layer (1) for cushioning or damping impact effects on the covering, an upper wear-resisting coating (2) applied thereto and an intermediate reinforcing netting (3) for stabilizing the cushioning layer (1), the two layers (1, 2) containing rubber chips (4) bound with polyurethane, said lower layer (1) also containing expanded clay (5) interspersed therein.
Claim 3
Dependent Claim
20 words
A sports ground covering as defined in claim 1 wherein said expanded clay is in the form of small balls.
References Cited (Backward Citations)
US4297408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |