Brushing – scrubbing – and general cleaning – Implements – Pipe – tube – or conduit cleaner
Reexamination Certificate
2008-06-17
2008-06-17
Chin, Randall (Department: 3723)
Brushing, scrubbing, and general cleaning
Implements
Pipe, tube, or conduit cleaner
Reexamination Certificate
active
07386908
ABSTRACT:
The present invention relates to a device intended to be passed through a pipeline of variable diameter, propelled by a liquid flowing inside said pipeline. The device has an elongated cylindrical body (2) made of polymer foam, with a number of deep channels (5) equally spaced from each other, coiled around the length of the cylindrical body (2) of the pig (1), beginning close to one end of the body (2) and ending close to the other end. These ends have a basically bulled-nosed shape, conferring a symmetrical aspect. Structural cleaning elements (6), not interconnected, are inserted inside the cylindrical body (2) of the pig. They are made of elastomeric material and have a central core (7) with spiral scraping extensions (8) of the same number as the deep channels (5) in the body (2) of the pig (1). The spiral scraping extensions (8) are at an angle to the axis of the cylindrical body (2) of the pig (1) as well as to the scraping extensions (8) of the adjacent modules, inasmuch as they follow the configuration of the spiral channel (5).
REFERENCES:
patent: 3602934 (1971-09-01), Reed
patent: 4016620 (1977-04-01), Powers
patent: 4242771 (1981-01-01), Knapp
patent: 4509222 (1985-04-01), Knapp
patent: 4720884 (1988-01-01), Ralls
patent: 5384929 (1995-01-01), Smith
patent: 5533224 (1996-07-01), Knapp
patent: 5895619 (1999-04-01), Knapp
patent: 6014789 (2000-01-01), Knapp
Capllonch Ricardo Wagner
Ferreira Lino Antonio Carlos
Chin Randall
Petroleo Brasileiro S/A - Petrobras
Sughrue & Mion, PLLC
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