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. 03, 1987
Filed:
Apr. 23, 1986
Applicant:
Inventors:
Sven Oldfelt, Vaxholm, SE;
Tage Fridolfsson, St. Germain-en Laye, FR;
Assignee:
Oy Wartsila AB, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E02B / ;
U.S. Cl.
CPC ...
405 37 ; 405 43 ;
Abstract
A land drainage system comprising sub-soil tubes (1) connected to a suction container (3) has the container evacuated by a dual function system comprising liquid pumping means (4) and air extracting means (6). A reservoir (5) can contain liquid to be passed into the soil (e.g. for irrigating the land).