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Class Information
Number: 521/51
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1) > Cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc. > Processes of preparing a cellular product having an integral skin
Description: Subject matter involving a process of preparing a cellular product having an integral skin.

Patents under this class:
1 2 3 4 5 6 7

Patent Number Title Of Patent Date Issued
4024089 Foamed acrylic polymer foam containing ethyl cellulose May. 17, 1977
4024090 Process for molding polyurethane foams May. 17, 1977
4021381 Integral-skinned polyurethane foam prepared in the presence of a phosphite or phosphine catalyst May. 3, 1977
4005035 Composition for reinforced and filled high density rigid polyurethane foam products and method of making same Jan. 25, 1977
3994839 Urethane modified carbodiimide foams derived from flame retardant polyols Nov. 30, 1976
3978855 Polyurethane foam surgical dressing Sep. 7, 1976
3978266 Surgical dressings Aug. 31, 1976
3975567 Surgical dressings Aug. 17, 1976
3975317 Method of preparing non-friable rigid polyurethane foam Aug. 17, 1976
3939106 Energy absorbing polyurethane-polyurea cellular elastomers Feb. 17, 1976
3931381 Mold release method for polyurethane integral-skin foam Jan. 6, 1976

1 2 3 4 5 6 7

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