Howard J. Troffkin

Follow

Person

Potomac, MD, US

People

Patents Grantslast 30 patents

Information Patent Grant
Battery separator
- Patent number 5,281,491
- Issue date Jan 25, 1994
- W. R. Grace & Co.
- Burton M. Rein
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Process of making a battery separator
- Patent number 5,240,655
- Issue date Aug 31, 1993
- W. R. Grace & Co.-Conn.
- Howard J. Troffkin
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Battery separator
- Patent number 4,731,304
- Issue date Mar 15, 1988
- W. R. Grace & Co.
- Joseph T. Lundquist
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Battery separator
- Patent number 4,650,730
- Issue date Mar 17, 1987
- W. R. Grace & Co.
- Joseph T. Lundquist
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Mortar topping with calcium nitrite
- Patent number 4,398,959
- Issue date Aug 16, 1983
- W. R. Grace & Co.
- Arnold M. Rosenberg
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES