Thomas Durham Winstead

US Patent:

45180962, May 21, 1985

Filed:

May 12, 1983

Appl. No.:

6/494048

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Maryland Cup Corporation - Owings Mills MD

International Classification:

B65D 4146
B65D 4148

US Classification:

220268

Abstract:

A drink-through lid for beverage containers is disclosed in which a pre-scored drink-through section is included which is removable by squeezing gripping surfaces on opposite sides of a score line which fractures the score line and permits the section to be pulled from the lid while causing the score to initiate a tearing action through the peripheral bead cavity of the lid to facilitate such removal. A continuous thermo-forming and scoring process and apparatus are provided to manufacture lids with scored sections having a predictable response to applied squeezing pressure on the gripping surfaces.

US Patent:

41152735, Sep 19, 1978

Filed:

Nov 15, 1976

Appl. No.:

5/742359

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Extracorporeal Medical Specialties, Inc. - King of Prussia PA

International Classification:

B01D 3100

US Classification:

210321A

Abstract:

An extracorporeal, disposable, dialyzer for use in a variety of artificial kidney or other mass transfer systems, which includes a sheet of plastic material supporting a flattened tube of membrane material, the sheet of support material consists of a continuous sheet of contoured, substantially uniform thickness material including a series of spaced apart hollow protrusions extending outwardly from each side thereof, the summits of the hollow protrusions defining membrane support surfaces on each side of the sheet, and the summits being arranged with respect to each other in predetermined wave patterns dimensioned and arranged such that, when an elongated length of the sheet is formed into a roll having predetermined inner and outer peripheral dimensions, the wave patterns will never be directly superimposed thereby avoiding the tendency of corresponding hollow protrusions to interdigitate and occlude the fluid flow passages.

US Patent:

44366795, Mar 13, 1984

Filed:

Nov 9, 1981

Appl. No.:

6/319403

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Maryland Cup Corporation - Owings Mills MD

International Classification:

B29D 2700

US Classification:

264 403

Abstract:

A method and apparatus for entraining gas as a blowing agent in a thermoplastic melt to provide a foamed thermoplastic extrudate wherein an annular sheet-like flow of gas under pressure is impinged on a tubular configuration of melt to entrain the gas in the melt is disclosed. Also disclosed is an improved method and apparatus for controlling the pressure in the thermoplastic melt.

US Patent:

43070493, Dec 22, 1981

Filed:

Feb 1, 1980

Appl. No.:

6/117510

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Maryland Cup Corporation - Owings Mills MD

International Classification:

B29N 1900

US Classification:

264 37

Abstract:

A method for continuously extruding, biaxially orienting and intermittently forming molded products from a web of thermoplastic material and further, continuously separating the products from the web selvage, stacking and handling the products and recycling the web selvage for further extrusion. The method uses intermittent molding and biaxial orientation devices into which configuration the continuously extruded web is interfaced by continuous-to-intermittent interfacing loop arrangement which preserves the dimensional and orientational integrity of the web maintains sufficient thermal stability therein to provide molded products which are free from defects such as stretch marks and other inertial and thermal discontinuities normally anticipated in cases of intermittent web advance of thermoplastic material at thermoformable temperature levels.

US Patent:

44166079, Nov 22, 1983

Filed:

Jun 15, 1981

Appl. No.:

6/273414

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Maryland Cup Corporation - Owings Mills MD

International Classification:

B29C 300

US Classification:

425325

Abstract:

An apparatus for continuously extruding, biaxially orienting and intermittently forming molded products from a web of thermoplastic material and further, continuously separating the products from the web selvage, stacking and handling the products and recycling the web selvage for further extrusion. The apparatus uses intermittent molding and biaxial orientation devices into which configuration the continuously extruded web is interfaced by continuous-to-intermittent interfacing loop arrangement which preserves the dimensional and orientational integrity of the web and maintains sufficient thermal stability therein to provide molded products which are free from defects such as stretch marks and other inertial and thermal discontinuities normally anticipated in cases of intermittent web advance of thermoplastic material at thermoformalbe temperature levels.

US Patent:

42501296, Feb 10, 1981

Filed:

Mar 13, 1978

Appl. No.:

5/886160

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Maryland Cup Corporation - Owings Mills MD

International Classification:

B29H 1900
B29D 704

US Classification:

264 37

Abstract:

A method and apparatus for continuously extruding, biaxially orienting and forming molded products from a web of thermoplastic material and further, continuously separating the products from the web selvage, stacking and handling the products and recycling the web selvage for further extrusion. The method and apparatus use continuous molding devices, namely, multiple mold cavities in a rotating polygon configuration over the peripheral surface of which the biaxially oriented web is securely and continuously positioned by a follower roller interfacing the polygon with a biaxial orientation device. Continuous and immediate interfacing is effected to prevent loss of orientation in the web which is kept at a temperature suitable for ingestion thereof into the mold cavities by vacuum, pressure or plug assist. In one preferred embodiment the inertia at the interface between the undulating peripheral surface of the rotating mold polygon and the biaxial orientation apparatus is reduced to an optimal minimum.

US Patent:

42884004, Sep 8, 1981

Filed:

Mar 13, 1978

Appl. No.:

5/886161

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Maryland Cup Corporation - Owings Mills MD

International Classification:

B29D 704

US Classification:

2642101

Abstract:

A method and apparatus for continuously extruding, biaxially orienting and intermittently forming molded products from a web of thermoplastic material and further, continuously separating the products from the web selvage, stacking and handling the products and recycling the web selvage for further extrusion. The method and apparatus use intermittent molding devices into which configuration the biaxially oriented web is interfaced by a continuous-to-intermittent interfacing structure which preserves the dimensional and orientational integrity of the web and maintains thermal stability therein. An undulating peripheral surface on a dynamic storage or accumulator drum and associated transfer rollers cooperate with intermittently advanced feed belts in timed relationship with a reciprocating forming press to effectuate the interface and product forming portions of the process. In some of the preferred embodiments the inertia at the interface between the undulating peripheral surface of the accumulator drum and the biaxial orientation apparatus is reduced to an optimal minimum.

US Patent:

44202911, Dec 13, 1983

Filed:

Jan 5, 1979

Appl. No.:

6/001178

Inventors:

Thomas W. Winstead - Baltimore MD

Assignee:

Maryland Cup Corporation - Owings Mills MD

International Classification:

F04B 1700
F04B 3504
F04C 216
F04C 1500

US Classification:

417338

Abstract:

A dynamic cooler apparatus is provided for dynamically cooling molten plastic extrudate while pumping metered amounts of that extrudate to an extrusion die or the like. The dynamic cooler apparatus utilizes bi-helical gears in a gear pump configuration in a housing in which a heat exchange medium is circulated. The heat exchange medium is also circulated internally of the gears so that the gear teeth and the housing act to cool discrete volumes of extrudate from four sides defined by the gear teeth and the internal surface of the housing. The bi-helical gears are driven to minimize loading between the teeth thereof and to permit the teeth to be as small as practical to present more cooling surface for a given cross-section of extrudate and optimize the heat transfer capability of the dynamic cooler apparatus. Provision is also made to use the molten extrudate as a lubricant for the shafts and bearings of the bi-helical gears.