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:
Jun. 16, 1998
Filed:
Oct. 23, 1995
Applicant:
Inventors:
James B Goddard, Powell, OH (US);
Lester H Gabriel, Sacramento, CA (US);
Assignee:
Advanced Drainage Systems, Inc., Columbus, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
138115 ; 138116 ; 138129 ;
Abstract
An improved pipe construction is disclosed having an inner and outer surface, intermediate walls extending between the inner and outer surfaces, and a plurality of primary and secondary internal cells. There are twice as many secondary internal cells as there are primary internal cells. Each of the primary internal cells is of a circular cross-section, while each of the secondary internal cells is of a three-sided cross-section. The primary and secondary cells are wound about the central longitudinal axis of the pipe. A method of forming the pipe of this structure is also disclosed.