The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 1993
Filed:
Oct. 26, 1992
Everett R Davis, Harwichport, MA (US);
Keith R Bartlett, Groveland, MA (US);
W. R. Grace & Co.-Conn., New York, NY (US);
Abstract
This invention provides an improved rollable subterranean drainage core device which has T-shaped finned projections to which may be adhered a water-penetrable soil filtration fabric. The fin structure provides impact resistance and high compressive strength while providing high water channel flow-through capabilities. An exemplary method for fabricating the drainage device involves extruding a unitary finned polymeric core sheet having T-shaped projection members on at least one major side thereof, and then removing a portion of the fins in a cross direction at periodic intervals along the machine direction, so that individual T-shaped projection members are spaced in rows and columns on the rollable core sheet. The drainage core member is particularly suitable for use in conjunction with waterproofing membranes.