US3661687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial grass sports field
Assignee: American Biltrite Inc
•
Filing: 1970-04-29
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Granted: 1972-05-09
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Expires: 1990-04-29
Abstract
Abstract The invention is a composite sports field in which the top surface is artificial grass, the next layer (down) is a layer of shock dissipating material, the next layer is a shock-absorbing material, and the bottom layer is a foundation which preferably is an asphalt composition suitably crowned to effect proper drainage.
Inventors
- 👤 Arthur F Spinney Jr
- 👤 Lawrence J Warnalis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:57
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/08; Y; Y10; Y10S; Y10S273/00; Y10S273/13; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23986; Y10T428/23993
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
17 words
The sports field of claim 1 in which the second layer is a polyvinyl chloride artificial resin.
Claim 2
Dependent Claim
27 words
The sports field of claim 2 in which a second layer is a continuous sheet comprising a plurality of individual sheets whose abutting edges are bonded together.
Claim 3
Dependent Claim
17 words
The sports field of claim 1 in which the third layer is a foamed, closed-cell polyvinyl resin.
Claim 4
Dependent Claim
27 words
The sports field of claim 4 in which the third layer is a continuous sheet comprising a plurality of individual sheets whose abutting edges are bonded together.
Claim 5
Dependent Claim
26 words
The sports field of claim 1 in which the second layer is a polyvinyl chloride resin, and the third layer is a foamed, closed-cell polyvinyl resin.
Claim 6
Dependent Claim
21 words
The sports field of claim 6 in which the fourth layer is selected from the group consisting of concrete and asphalt.
References Cited (Backward Citations)
US2515847A
Cited
US3332828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |