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. 20, 1989
Filed:
Aug. 06, 1987
Takashi Watanabe, Tokyo, JP;
Nishihara Engineering Company, Ltd., Tokyo, JP;
Abstract
A drainage system installed in a building for conducting waste water from such sanitary fixtures as toilet bowls into the underground sewer, has a stack extending through the floor of each story of the building and branch pipes for conducting the waste water from the fixtures mounted on each floor into the stack through connectors. The stack and each connector have a double structure comprising inner and outer members. The inside of the inner member is used for the discharge of waste water, while the space formed between the inner and the outer member communicates with the inside of the inner member within each connector to permit the flow of air necessary for eliminating a pressure variation induced inside the inner members by the flow of waste water.