Jonathan Lipowitz

52387429, Aug 24, 1993

Dec 16, 1991

7/808301

Harvey A. Freeman - Sanford MI
Neal R. Langley - Midland MI
Chi-Tang Li - Midland MI
Jonathan Lipowitz - Midland MI
James A. Rabe - Midland MI

Dow Corning Corporation - Midland MI

C01B 3136
C07F 708

428367

The present invention relates to ceramic fibers of the Si-C-N-O series with a diameter less than about 20 micrometers. It has been unexpectedly found that the thermal stability of these fibers can be increased by minimizing the impurity content, primarily the content of metals or metallic compounds. Such fibers with low levels of contaminants retain greater than about 60 percent of their initial tensile strength when subjected to temperatures of 1300. degree. -1400. degree. C. for at least 30 minutes in a non-oxidative environment.

49216570, May 1, 1990

Nov 13, 1987

7/120108

James A. Rabe - Midland MI
Jonathan Lipowitz - Midland MI
Richard E. Jones - Midland MI

Dow Corning Corporation - Midland MI

B28B 126

264 86

The elastic modulus and density of an amorphous, ceramic article derived from a resinous organosilicon polymer and having a composition consisting essentially of silicon, nitrogen and/or carbon are increased while substantially maintaining or improving tensile strength by heat treating the ceramic article at an elevated temperature under superatmospheric nitrogen pressure to increase its density while avoiding crystallization. During heat treatment, at least some of the conditions of time, temperature, heating rate, cooling rate, pressure and atmosphere are controlled to minimize erosion of the article which could otherwise occur due to the loss to the surrounding atmosphere, as a gas or gaseous component, of at least one of nitrogen, silicon and carbon. The heat treated, ceramic article is amorphous and non-crystalline and has a density substantially greater than 2. 5 g/cc together with desirable values of tensile strength and elastic modulus.

58402420, Nov 24, 1998

Apr 22, 1997

8/837664

William Henry Atwell - Midland MI
Duane Ray Bujalski - Auburn MI
Jonathan Lipowitz - Midland MI
Kai Su - Midland MI
Gregg Alan Zank - Tokyo, JP

Dow Corning Corporation - Midland MI

C04B 35571

264470

The present invention relates to a method for preparing a ceramic fiber from alkenyl or alkynyl functional resins and to the ceramic fibers produced therefrom. The method comprises (A) forming a fiber from a siloxane resin comprised of R. sup. 1. sub. a R. sup. 2. sub. b RSiO. sub. (3-a-b)/2 units wherein R is an unsaturated carbon group; each R. sup. 1 is selected from the group consisting essentially of an aryl group having from 6 to 10 carbon atoms and functional derivatives thereof; each R. sup. 2 is selected from the group consisting essentially of an alkyl group having from 1 to 4 carbon atoms and functional derivatives thereof; a has a value of 0, 1 or 2; b has a value of 0, 1, or 2 with the proviso that a+b

43117600, Jan 19, 1982

Aug 8, 1977

5/822474

Robert E. Kalinowski - Auburn MI
Jonathan Lipowitz - Midland MI

Dow Corning Corporation - Midland MI

B32B 2502
B32B 2520
B05D 302

428391

Condensation-polymer fibers, such as polyethylene terephthalate fibers, and cellulosic fibers, such as cotton, have their surface modified with certain polydiorganosiloxanes to provide improved properties such as water repellency, hand, and tear strength to fabrics comprising the treated fibers. The polydiorganosiloxanes must contain at least two silicon bonded HSR'-groups wherein R' is a divalent or a trivalent saturated hydrocarbon radical or at least one HSR'-group and at least one --OR" radical bonded to silicon. Exemplary is a polyester fabric which is treated with an aqueous emulsion of ##STR1## and dried to provide a textile having improved hand.

61298875, Oct 10, 2000

Aug 26, 1998

9/140824

Thomas Duncan Barnard - Midland MI
Jonathan Lipowitz - Midland MI
Kimmai Thi Nguyen - Midland MI

Dow Corning Corporation - Midland MI

C04B 4000

264640

A process for producing polycrystalline silicon carbide includes heating an amorphous ceramic fiber that contains silicon and carbon in an environment containing boron oxide vapor. The boron oxide vapor is produced in situ by the reaction of a boron containing material such as boron carbide and an oxidizing agent such as carbon dioxide, and the amount of boron oxide vapor can be controlled by varying the amount and rate of addition of the oxidizing agent.

51358093, Aug 4, 1992

Sep 27, 1989

7/577165

James A. Rabe - Midland MI
Jonathan Lipowitz - Midland MI
Richard E. Jones - Midland MI

Dow Corning Corporation - Midland MI

C04B 3552

428367

The elastic modulus and density of an amorphous, ceramic article derived from a resinous organosilicon polymer and having a composition consisting essentially of silicon, nitrogen and/or carbon are increased while substantially maintaining or improving tensile strength by heat treating the ceramic article at an elevated temperature under superatmospheric nitrogen pressure to increase its density while avoiding crystallization. During heat treatment, at least some of the conditions of time, temperature, heating rate, cooling rate, pressure and atmosphere are controlled to minimize erosion of the article which could otherwise occur due to the loss to the surrounding atmosphere, as a gas or gaseous component, of at least one of nitrogen, silicon and carbon. The heat treated, ceramic article is amorphous and non-crystalline and has a density substantially greater than 2. 5 g/cc together with desirable values of tensile strength and elastic modulus.

48898996, Dec 26, 1989

Sep 8, 1987

7/094347

Duane R. Bujalski - Bay City MI
Gary E. Le Grow - Midland MI
Jonathan Lipowitz - Midland MI
Thomas F. Lim - Solon OH

Dow Corning Corporation - Midland MI

C08F28300
C08G 7704

525479

A method is described to prepare preceramic polysilanes which contain at least one weight percent vinyl. To ensure the survival of the vinyl groups in the polysilane the reaction and process conditions must be carefully controlled. The vinyl-containing polysilanes can be formed into fibers, cured either thermally or by UV irradiation, and then pyrolyzed to form ceramic fibers. Thermal curing and pyrolysis can be combined into a single process step.

54362075, Jul 25, 1995

Dec 10, 1993

8/164865

William H. Atwell - Midland MI
Donald M. Bartos - Midland MI
Patrick J. Harder - Bay City MI
Jonathan Lipowitz - Midland MI
Chandan K. Saha - Midland MI

Dow Corning Corporation - Midland MI

C04B 35571

501 88

Disclosed is a process for the formation of silicon carbide powder in which vaporized polysiloxanes are reacted and pyrolyzed in a single heating step to form the silicon carbide powder. The process is simple and inexpensive and yields powder having desirable characteristics.