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:
May. 12, 1992
Filed:
Dec. 18, 1990
Octavian P Dumitrascu, Fountain Valley, CA (US);
Charles A McMillen, Alta Loma, CA (US);
Rain Bird Sprinkler Mfg. Corp., Glendora, CA (US);
Abstract
A drip irrigation tube formed by longitudinally folding an elongated web having thick marginal side portions, and overlapping and sealing the thick marginal sides to form a tube. Discrete emitter elements are disposed at spaced intervals along the web and are formed by embossing or otherwise forming recessed emission grooves in one of the thick marginal edges so as to form a flow path from the inside of the tube to the outside. The emitter elements operate to provide a constant flow rate over a wide range of working pressures by controlled deformation and constriction of size of relatively short emitter passageways formed by a portion of the emission grooves.