Timothy J Dougherty

US Patent:

52704866, Dec 14, 1993

Filed:

May 29, 1992

Appl. No.:

7/891351

Inventors:

Maureen G. Chan - New Providence NJ
Kent B. Connole - Columbus OH
Timothy S. Dougherty - Phoenix AZ
Karen D. Dye - Phoenix AZ
Stanley Kaufman - Dunwoody GA
Valerie J. Kuck - Upper Montclair NJ
Leonard D. Loan - late of New Providence NJ
Edward D. Nelson - Stone Mountain GA
Raffaele A. Sabia - Marlboro NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H01B 728

US Classification:

174 23R

Abstract:

An insulated conductor (20) for use in a communication cable which includes a filling material (30) includes a copper conductor (25) and a composite insulation system (27) comprising two concentric layers of insulation. An inner foam layer (28) of the insulation comprises a cellular plastic material (28) which includes a stabilizer system. An outer layer (29) of the insulation is referred to as a skin and comprises a stabilized solid plastic material. The stabilizer system in each of the cellular and solid layers includes a bifunctional portion that functions as an antioxidant and as a metal deactivator and that has a relatively high resistance to extraction. The level of the bifunctional portion of the stabilizer in the cellular material is substantially greater than that in the skin inasmuch as it has been found that the level of the stabilizer cellular layer contiguous to the copper wire determines the oxidation performance level of the composite insulation.

US Patent:

39731871, Aug 3, 1976

Filed:

Jun 2, 1975

Appl. No.:

5/583003

Inventors:

Manuel Ramon Cereijo - Atlanta GA
Timothy Stephen Dougherty - Norcross GA

Assignee:

Western Electric Company, Inc. - New York NY

International Classification:

G01R 2726

US Classification:

324 61R

Abstract:

The capacitance and diameter-over-dielectric of successive sections of a cellular plastic material are monitored continuously. The monitoring provides a continuous indication of the capacitance and the diameter with respect to the percent expansion of the cellular plastic material and the weight of the material per unit length of the conductor. This facilitates the regulation of process variables to maintain the capacitance and diameter-over-dielectric within acceptable ranges of values.

US Patent:

39471730, Mar 30, 1976

Filed:

May 28, 1974

Appl. No.:

5/473990

Inventors:

Timothy Stephen Dougherty - Norcross GA

Assignee:

Western Electric Company, Inc. - New York NY

International Classification:

B29F 310

US Classification:

425113

Abstract:

First and second concentric insulating sheaths of plastic materials are formed continuously around a filamentary core advancing longitudinally through an extrusion chamber. The core is passed axially through a tapered entrance portion and a coaxially aligned tapered throat portion formed in a separable die disposed in the chamber. Fluent plastic material for the first sheath is delivered from a main extrusion bore, impinging on the core circumferentially at the entrance portion of the die, the flow thereof being developed as it passes into the throat portion thereof. Fluent plastic material for the second sheath is delivered from an auxiliary extrusion bore flowing through a plurality of dividing channels formed in the die and radially inward at a plurality of circumferentially spaced points around the die axis into an annular manifold or reservoir where the fluid pressure of the plastic achieves a steady state condition. The plastic is forced from the manifold circumferentially, flowing in a frustoconical channel formed in the die which terminates in an annular fluid inlet formed in the throat portion of the die to impinge circumferentially around the first sheath, forming both sheaths simultaneously around the core.

US Patent:

41742362, Nov 13, 1979

Filed:

Aug 31, 1977

Appl. No.:

5/829362

Inventors:

Timothy S. Dougherty - Roswell GA
William M. Flegal - Tucker GA

Assignee:

Western Electric Company, Inc. - New York NY

International Classification:

B29D 2700
B29F 310

US Classification:

156 51

Abstract:

Capacitance unbalance-to-ground between conductors of a twisted pair, each of which may be insulated with at least a layer of cellular plastic insulation, is maintained within acceptable limits by controlling the extrusion of the insulation to maintain the measured coaxial capacitance and associated outside diameter of the insulated conductors within a range of values which correspond to acceptable capacitance unbalance-to-ground values.

US Patent:

44120940, Oct 25, 1983

Filed:

Jul 28, 1981

Appl. No.:

6/287620

Inventors:

Timothy S. Dougherty - Roswell GA
John J. Kissell - Dunwoody GA
Glenn L. Schmehl - Kingsville MD

Assignee:

Western Electric Company, Inc. - New York NY

International Classification:

H01B 734

US Classification:

174110F

Abstract:

A cable which is suitable for use as a riser cable in buildings comprises a plurality of conductors each of which is covered with a composite insulation. The composite insulation comprises an inner layer of an expanded polyethylene material and an outer layer of a polyvinyl chloride material with the percent expansion of the inner layer and the thickness of the outer layer being such as to optimize several cable parameters. The resultant cable is one which has excellent fire-retardant properties such as, for example, an unusually low fuel content. Advantageously, this same cable lends itself to color coding for inside wiring and is capable of having a relatively high pair count density. All these parameters are optimized within the framework of specific transmission requirements.

US Patent:

41033531, Jul 25, 1978

Filed:

Sep 8, 1976

Appl. No.:

5/721643

Inventors:

Timothy Stephen Dougherty - Roswell GA

Assignee:

Western Electric Company, Inc. - New York NY

International Classification:

B29B 106

US Classification:

366 81

Abstract:

A typical compression relief design extruder screw having a helical flight for advancing and working a thermoplastic material is modified to shorten the feed and compression sections and to include a plurality of force-producing components in at least the compression section of the screw such that at least some portion of the components in any one turn of the flight lie in one plane essentially normal to the axis of rotation of the screw and such that the walls of the flight are uninterrupted. This arrangement controls the location of the rupturing or fragmenting of what is referred to as the solid bed and controls the manner in which it is fragmented to provide an extrudate at a die end of the extruder which has a constant temperature and and which is uniform throughout each successive section of the thermoplastic material. Further, corresponding portions of the successive sections of the thermoplastic material at the die end are caused to have substantially identical time-temperature profiles which is particularly advantageous when extruding expandable insulation in minimizing amplitude of variation in the coaxial capacitance and the diameter of the insulated conductor.

US Patent:

41072600, Aug 15, 1978

Filed:

Dec 14, 1976

Appl. No.:

5/750471

Inventors:

Timothy Stephen Dougherty - Roswell GA

Assignee:

Western Electric Company, Inc. - New York NY

International Classification:

B29B 106

US Classification:

264349

Abstract:

Methods are provided for processing expandable thermoplastic materials with a typical compression relief design extruder screw having a helical flight for advancing and working a thermoplastic material. The screw is modified to shorten the feed and compression sections and to include a plurality of force-producing components in at least the compression section of the screw such that at least some portion of the components in any one turn of the flight lie in one plane essentially normal to the axis of rotation of the screw and such that the walls of the flight are uninterrupted. This arrangement controls the location of the rupturing or fragmenting of what is referred to as the solid bed and controls the manner in which it is fragmented to provide an extrudate at a die end of the extruder which has a constant temperature and which is uniform throughout each successive section of the thermoplastic material. Further, corresponding portions of the successive sections of the thermoplastic material at the die end are caused to have substantially identical time-temperature profiles which is particularly advantageous when extruding expandable insulation in minimizing amplitude of variation in the coaxial capacitance and the diameter of the insulated conductor.

US Patent:

40172287, Apr 12, 1977

Filed:

Jun 2, 1975

Appl. No.:

5/583002

Inventors:

Manuel Ramon Cereijo - Atlanta GA
Timothy Stephen Dougherty - Norcross GA

Assignee:

Western Electric Company, Inc. - New York NY

International Classification:

B29F 310

US Classification:

425 71

Abstract:

The capacitance and diameter-over-dielectric of successive sections of a conductor having a layer of cellular plastic insulation extruded thereon are monitored continuously. The monitoring provides a continuous indication of the capacitance and the diameter with respect to the percent expansion of the cellular plastic insulation and the weight of the insulation per unit length of the conductor. This facilitates the regulation of process variables to maintain the capacitance and diameter-over-dielectric within acceptable ranges of values.