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:
Aug. 22, 1978
Filed:
Jun. 20, 1977
Martti Olavi Ebeling, Helsinki, FI;
Risto Waldemar Lunden, Helsinki, FI;
Kontekla Oy, Helsinki, FI;
Abstract
A rain water outlet for a roof of a building comprising a vertical pipe and a trough fixed to the upper end of said pipe. A lid is fastened in the trough above the inlet end of said pipe. The lid forms a closed surface larger than the inlet end to cause water to flow radially in the trough to said inlet end and to prevent axial suction of air into the pipe. A sieve is positioned between the lid and the bottom of the trough to surround said inlet end. The sieve is provided with perforations through which water flows from the trough into said inlet end. The relation between the total area of the perforations of the sieve and the cross-sectional area of the outlet pipe is between 2.5 and 3.5.