Mark M Markovitz

US Patent:

6359232, Mar 19, 2002

Filed:

Dec 19, 1996

Appl. No.:

08/770037

Inventors:

Mark Markovitz - Schenectady NY
James Jonathan Grant - Niskayuna NY
William Edward Tomak - Scotia NY
William Paul Dobbins - Clifton Park NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01B 1732

US Classification:

174209, 310196, 174137 B, 174138 C

Abstract:

Resin-impregnated sheet materials, such as fabrics, films, paper and tapes, for forming electrical insulation that exhibits significantly improved voltage endurance performance. The present invention finds particular use as groundwall insulation for high voltage generator stator bars, in which the groundwall insulation is formed by mica tape filled with submicron particles of silicon dioxide, aluminum oxide, titanium dioxide and/or zirconium dioxide, in combination with an unfilled mica tape impregnated with the same or compatible resin binder. The filled tape is preferably in the form of a mica paper having at least one woven fabric on at least one of its surfaces, a resin binder permeating the mica paper and woven fabric so as to bond the woven fabric to the mica paper, and oxide particles dispersed in the woven fabric.

US Patent:

6663816, Dec 16, 2003

Filed:

Jan 31, 2002

Appl. No.:

10/059179

Inventors:

Karim Younsi - Saratoga County NY
David A. Snopek - Peterborough County, CA
Luc Lafortune - Laval, CA
Jeff D. Sheaffer - Glenville NY
William R. Mischler - Niskayuna NY
Mark Markovitz - Niskayuna NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

B29C 7074

US Classification:

2642722, 26427219, 29596

Abstract:

A method for making a dynamoelectric machine conductor bar, compromises providing a plurality of bundled together spiraling strand conductors having surrounding insulation to define a substantially rectangular shape with the strand conductors and strand insulation defining an opposing conductor bar end portion having an electrically insulated gap between the strand insulation adjacent the bar end portion; and applying a filler material to fill the gap to electrically shield the conductor bar end portion and to a greater than 0. 080 to about 1. 5 inch continuous outer radius surface end portion. A dynamoelectric machine conductor bar comprises a plurality of bundled together spiraling strand conductors having surrounding insulation to define a substantially rectangular shape, with the strand conductors and strand insulation defining an opposing conductor bar end portion; an electrically non-insulated gap between the strand insulation adjacent the conductors at the bar end portion; and an applied filler material filling the gap to electrically shield the conductor bar end portion an applied filler material filling the gap to electrically shield the conductor bar end portion, wherein the filler material defines a greater than 0. 080 to about 1. 5 inch continuous outer radius surface end portion.

US Patent:

6768240, Jul 27, 2004

Filed:

May 30, 2003

Appl. No.:

10/448522

Inventors:

Karim Younsi - Saratoga County NY
David A. Snopek - Peterborough County, CA
Luc Lafortune - Laval, CA
Jeff D. Sheaffer - Glenville NY
William R. Mischler - Niskayuna NY
Mark Markovitz - Niskayuna NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H02K 332

US Classification:

310201, 31196, 31198

Abstract:

A method for making a dynamoelectric machine conductor bar, compromises providing a plurality of bundled together spiraling strand conductors having surrounding insulation to define a substantially rectangular shape with the strand conductors and strand insulation defining an opposing conductor bar end portion having an electrically insulated gap between the strand insulation adjacent the bar end portion; and applying a filler material to fill the gap to electrically shield the conductor bar end portion and to a greater than 0. 080 to about 1. 5 inch continuous outer radius surface end portion. A dynamoelectric machine conductor bar comprises a plurality of bundled together spiraling strand conductors having surrounding insulation to define a substantially rectangular shape, with the strand conductors and strand insulation defining an opposing conductor bar end portion; an electrically non-insulated gap between the strand insulation adjacent the conductors at the bar end portion, and an applied filler material filling the gap to electrically shield the conductor bar end portion an applied filler material filling the gap to electrically shield the conductor bar end portion, wherein the filler material defines a greater than 0. 080 to about 1. 5 inch continuous outer radius surface end portion.

US Patent:

7311971, Dec 25, 2007

Filed:

Aug 3, 2004

Appl. No.:

10/909288

Inventors:

Mark Markovitz - Schenectady NY, US
William Gene Newman - Scotia NY, US
Mabel Shang Yung - Clifton Park NY, US
Leonard Paul Squillacioti - Saratoga Springs NY, US
Peter John Foley - Scotia NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B32B 27/38
C08L 63/00

US Classification:

428413, 4244744

Abstract:

Novel one part, heat cured pressure-sensitive adhesives capable of bonding metallic and non-metallic materials at ambient temperatures and curing at elevated temperatures to form a bond with very high adhesive bond strengths at temperatures up to at least 160 C. The invention is particularly well suited for use with insulated copper coils in electrical generators and includes both the adhesive compositions per se and adhesive transfer tapes capable of bonding to the copper coils at ambient temperatures upon contact due to the pressure sensitive tack of the adhesive. The transfer tapes can subsequently be cured to a hard, thermoset adhesive with high adhesive bond strength. In applications on insulated copper coils, exemplary one part, heat cured pressure-sensitive adhesives can be used either alone or in combination with a substrate to form single or double-sided adhesive tape capable of securing the generator rotor turn insulation. The pressure sensitive materials can also be applied to a mat carrier, such as aramid paper, polyester glass, or glass cloth based epoxy sheets.

US Patent:

20040063896, Apr 1, 2004

Filed:

Sep 30, 2002

Appl. No.:

10/259389

Inventors:

Mark Markovitz - Schenectady NY, US
William Newman - Scotia NY, US
Alan Iversen - Clifton Park NY, US
Mabel Yung - Clifton Park NY, US

International Classification:

C08G059/68

US Classification:

528/092000

Abstract:

Resin composition comprising an epoxy resin having an epoxide functionality of at least 2.5, a cycloaliphatic epoxy resin, a phenol-formaldehyde novolac and aluminum acetylacetonate. The resin is heat stable and is suitable for fabrication of resin-rich mica tapes having low reactivity at ambient temperatures for good shelf life stability combined with high reactivity above 140 C. for application in press-cured tapes. The dissipation factors at room temperature to at least 200 C. are less than 3.0%.

US Patent:

20040202782, Oct 14, 2004

Filed:

Apr 14, 2003

Appl. No.:

10/249482

Inventors:

Mark Markovitz - Schenectady NY, US
Peter Foley - Glenville NY, US
James Armienti - Guilderland NY, US
Ivan Proctor - Scotia NY, US
Robert Hamilton - Georgetown MA, US

Assignee:

GENERAL ELECTRIC COMPANY - Schenectady NY

International Classification:

B32B035/00

US Classification:

427/140000

Abstract:

A method for repairing insulation material applied to at least one electrical winding, wherein the method includes identifying an area to be repaired, applying epoxy to the area to be repaired, covering the epoxy with at least one of an adhesive tape and a release film, curing the epoxy, removing at least one of the adhesive tape and the release film, and finalizing the epoxy height.

US Patent:

20060116444, Jun 1, 2006

Filed:

Jan 17, 2006

Appl. No.:

11/332248

Inventors:

Mark Markovitz - Schenectady NY, US
William Newman - Scotia NY, US
Alan Iversen - Clifton Park NY, US
Mabel Yung - Clifton Park NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

C08L 63/00
C08G 59/50

US Classification:

523400000

Abstract:

Resin composition comprising an epoxy resin having an epoxide functionality of at least 2.5, a cycloaliphatic epoxy resin, a phenol-formaldehyde novolac and aluminum acetylacetonate. The resin is heat stable and is suitable for fabrication of resin-rich mica tapes having low reactivity at ambient temperatures for good shelf life stability combined with high reactivity above 140 C. for application in press-cured tapes. The dissipation factors at room temperature to at least 200 C. are less than 3.0%.

US Patent:

46031820, Jul 29, 1986

Filed:

Oct 5, 1984

Appl. No.:

6/658102

Inventors:

Mark Markovitz - Schenectady NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

C08L 6302

US Classification:

525529

Abstract:

The viscosities of solventless compositions of epoxy resins containing 1, 2 epoxy groups and having at least two epoxide groups per molecule and effective amounts of catalytic hardener and phenolic accelerator are dramatically reduced to make them useful for vacuum-pressure impregnation and also for pre-impregnated insulating material applications by addition of 3-33% of reactive diluent such as styrene.