Robert C Donohue

US Patent:

7708541, May 4, 2010

Filed:

Oct 1, 2004

Appl. No.:

10/574375

Inventors:

Robert James Donohue - Clayton NC, US

Assignee:

Natvar Holdings, Inc. - Somerville NJ

International Classification:

B29C 53/08

US Classification:

4253021

Abstract:

A method and apparatus for continuously producing preselected lengths of coiled tubing are disclosed. According to the method, plastic tubing is continuously wound onto a rotating main tube shaft (). Downstream from the point where the tubing begins to wind about the shaft, a heat source () is directed toward the coiled tubing, softening it as it traverses thereby. Further downstream, a cool-air source () directed at the softened tubing sets the tubing into its coiled form. Subsequently, the coiled tubing is cut into preselected lengths by a cutter () downstream from the cool-air source.

US Patent:

20070119511, May 31, 2007

Filed:

Nov 29, 2006

Appl. No.:

11/606269

Inventors:

Robert Donohue - Clayton NC, US
George Coggins - Raleigh NC, US
Perry Benson - Benson NC, US

International Classification:

F16L 9/18

US Classification:

138114000, 138137000, 138140000, 138141000, 428036910

Abstract:

A co-extruded tubing for the administration of intravenous fluids has an outer layer of a polyester. An inner fluid-contact layer may be of a polyethylene or of a thermoplastic polyurethane. Where the inner fluid-contact layer is of polyethylene, an intermediate tie layer of ethylene-vinyl acetate copolymer may be included to prevent delamination.