Robert H. Hofeldt

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Littleton, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Sealed containers and sealing compositions for them
- Patent number 5,227,411
- Issue date Jul 13, 1993
- W. R. Grace & Co.-Conn.
- Robert H. Hofeldt
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Sealed containers and sealing compositions for them
- Patent number 5,204,389
- Issue date Apr 20, 1993
- W. R. Grace & Co.-Conn.
- Robert H. Hofeldt
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Sealed containers and sealing compositions for them
- Patent number 5,106,886
- Issue date Apr 21, 1992
- W. R. Grace & Co.-Conn.
- Robert H. Hofeldt
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Plastisol sealing gaskets puffed with hollow discrete spheres
- Patent number 4,485,192
- Issue date Nov 27, 1984
- W. R. Grace & Co.
- David A. Gibbs
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Sealing compositions for minimizing soluble iron migration
- Patent number 4,278,718
- Issue date Jul 14, 1981
- W. R. Grace & Co.
- Charles A. Billings
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...