Grass protecting walkway grid
Patent 4596731 Issued on June 24, 1986. Estimated Expiration Date: 
September 17, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 17, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 964601 2577890 2828843 3772419 3786989 3802144 3836075 3858803 3925946 Playing surface InventorsApplicationNo. 06/651236 filed on 09/17/1984US Classes:428/134, Noncircular aperture (e.g., slit, diamond, rectangular, etc.)404/36, Foraminous traffic surface404/41, Interfitting428/131, Including aperture428/141, Continuous and nonuniform or irregular surface on layer or component (e.g., roofing, etc.)428/44, TWO DIMENSIONALLY SECTIONAL LAYER47/1.01F, Modified earth's surface, e.g., sod, turf, reinforced47/1.01R, MISCELLANEOUS52/177, SPECIFIED WEAR OR FRICTION-TYPE TRAFFIC-CARRYING SURFACE52/180Perforate structure having twisted element or particular surfaceExaminersPrimary: Thomas, Alexander S.Attorney, Agent or FirmInternational ClassesE01C 5/00 (20060101)E01C 9/00 (20060101) E01C 13/08 (20060101) E04F 19/00 (20060101) E04F 19/10 (20060101) E01C 5/20 (20060101) A63C 19/00 (20060101) A63C 19/04 (20060101) A63C 19/12 (20060101) AbstractA grass protecting walkway having a substantially flat elongated grid-like structure which defines a plurality of polygonal apertures is disclosed. The grid allocates its bottom and top planar surface areas approximately equally between the surface area of the apertures and the surface area of structured cross members.Other References
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