Howard M Hammel

20130327996, Dec 12, 2013

Aug 14, 2013

13/966397

Howard S. Hammel - Bear DE, US

E I DU PONT DE NEMOURS AND COMPANY - Wilmington DE

C09K 5/04
C09K 21/08

252602, 252 68

The present invention relates to compositions comprising flammable refrigerant, fire hazard-reducing agent, and optionally a lubricant suitable for use in a refrigeration or air conditioning apparatus. Further, the present invention relates to compositions comprising lubricant and fire hazard-reducing agent and methods for reducing flammability of flammable refrigerant, for delivering a fire hazard-reducing agent to a refrigeration or air conditioning apparatus, and for replacing a non-flammable refrigerant with a flammable refrigerant.

51341719, Jul 28, 1992

Jan 27, 1992

7/826357

Howard S. Hammel - Bear DE
Robert O. York - Wilmington DE

E. I. Du Pont de Nemours and Company - Wilmington DE

C08J 914

521 98

Closed cell rigid polyhydroxy acid resin compositions foamed with environmentally benign, which compositions are degradable and cause minimal environmental impact when discarded.

59122790, Jun 15, 1999

Jul 23, 1997

8/898979

Howard Sims Hammel - Bear DE
Robert Oliver York - Wilmington DE

E. I. du Pont de Nemours and Company - Wilmington DE

C08G 1814

521146

An improved closed cell polymer foam and foaming agent involving the use of a hydrogen-containing halocarbon blowing agent (e. g. , HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e. g. , organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value. A closed cell thermoplastic foam such as polyethylene, polypropylene, polystyrene, among others, is disclosed produced by means of an environmentally friendly nonflammable blowing agent substantially free of halogen substituents other than fluorine and comprising HFC-134 (1,1,2,2-tetrafluoroethane).

55322840, Jul 2, 1996

Feb 17, 1995

8/390911

Philip L. Bartlett - Wilmington DE
Joseph A. Creazzo - Wilmington DE
Howard S. Hammel - Bear DE

E. I. Du Pont de Nemours and Company - Wilmington DE

C08G 1814

521134

An improved closed cell polymer foam and foaming agent involving the use of a halocarbon blowing agent (e. g. , HCFC-22, HCFC-123, HCFC-123a, and HCFC-141b) in combination with an effective amount of a gas barrier resin (e. g. , an ethylene/vinyl acetate copolymer, ethylene/acrylic ester copolymer or acrylic ester polymer) uniformly dispersed in the continuous polymeric phase. The presence of the gas barrier resin is shown to significantly reduce the escape of blowing agent from and/or entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value.

55168116, May 14, 1996

Apr 24, 1995

8/427643

Philip L. Bartlett - Wilmington DE
Joseph A. Creazzo - Wilmington DE
Howard S. Hammel - Bear DE

E. I. Du Pont de Nemours and Company - Wilmington DE

C08J 902
C08G 1800
C08L 2506
C08L 7504

521131

An improved closed-cell polymer foam involves the use of a polyfluorocarbon forming agent (e. g. , HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e. g. , organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value.

54399475, Aug 8, 1995

Nov 9, 1992

7/973599

Philip L. Bartlett - Wilmington DE
Joseph A. Creazzo - Wilmington DE
Howard S. Hammel - Bear DE

E. I. Du Pont de Nemours and Company - Wilmington DE

C08J 902
C08L 2506
C08L 7504

521131

An improved closed cell polymer foam and foaming agent involving the use of a hydrogen-containing halocarbon blowing agent (e. g. , HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e. g. , organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value.

61213373, Sep 19, 2000

Jul 23, 1997

8/898980

Howard Sims Hammel - Bear DE
Joseph Anthony Creazzo - Wilmington DE

E. I. du Pont de Nemours and Company - Wilmington DE

C08J 914

521131

An improved closed cell polymer foam and foaming agent involving the use of a hydrogen-containing halocarbon blowing agent (e. g. , HCFC-22) in combination with an effective amount of a hydrogen bond forming blocking agent (e. g. , organic ether, ester or ketone). The presence of the blocking agent is shown to significantly reduce the escape of blowing agent from and entry of air into the foam resulting in low thermal conductivity over a longer period of time and improved thermal insulation value. The present invention further relates to compositions comprising a blowing agent and an active hydrogen-containing compound, commonly referred to in the art as B-side compositions or blends, and using such compositions for producing polyurethane and polyisocyanurate foams in which the blowing agent comprises a major proportion of 1,1,2,2-tetrafluoroethane (HFC-134).