Timothy M Dougherty

US Patent:

49103598, Mar 20, 1990

Filed:

Oct 31, 1988

Appl. No.:

7/264603

Inventors:

Timothy S. Dougherty - Phoenix AZ
Robert E. Streich - Phoenix AZ

Assignee:

American Telephone and Telegraph Company, AT&T Technologies, Inc. - Berkeley Heights NJ

International Classification:

H01B 706
H01B 702

US Classification:

174 69

Abstract:

Cordage (17) which may be used for any of the commonly marketed lengths of etractile cords comprises an array of a plurality of conductors (11--11) each insulated with a suitable plastic material. The array of conductors is enclosed in inner and outer jackets (52, 54). The inner jacket comprises a polyvinyl chloride (PVC) plastic material, for example, and has a thickness of about 0. 015 inch. Covering the inner jacket is an outer jacket comprising a polyvinyl chloride plastic material having a thickness of about 0. 005 inch and having a colorant constituent. The PVC composition of the inner jacket is such that it is a less expensive composition than that of the outer jacket. Enclosing the outer jacket is a layer (56) which comprises a top coating material. The top coating material provides the cordage with enhanced retractibility and prevents discoloration as well as plasticizer migration from the outer jacket.