Synthetic Resins Or Natural Rubbers -- Part Of The Class 520 Series Patents (Class 521)

Synthetic resins (class 520, subclass 1)

Cellular polymer containing a carbodiimide structure (Class 521/901)

Cellular polymer containing an isocyanurate structure (Class 521/902)

Cellular polymer having reduced smoke or gas generation (Class 521/903)

Polyurethane cellular product having high resiliency or cold cure property (Class 521/904)

Hydrophilic or hydrophobic cellular product (Class 521/905)

Polyurethane cellular product containing unreacted flame-retardant material (Class 521/906)

Nonurethane flameproofed cellular product (Class 521/907)

Nucleating agent for cellular product (Class 521/908)

Blowing-agent moderator, e.g., kickers, etc. (Class 521/909)

Plural blowing agents for producing nonpolyurethane cellular products (Class 521/910)

Surfactant for other than polyurethane cellular product (Class 521/911)

Separated reactive materials utilized in preparing cellular product (Class 521/912)

Cell forming in absence of external heat (Class 521/913)

Polyurethane cellular product formed from a polyol which has been derived from at least two 1,2 epoxides as reactants (Class 521/914)

Utilizing electrical or wave energy during cell forming process (Class 521/915)

Cellular product having enhanced degradability (Class 521/916)

Specialized mixing apparatus utilized in cell forming process (Class 521/917)

Physical aftertreatment of a cellular product (Class 521/918)

Sintered product (Class 521/919)

Cellular product containing a dye or pigment (Class 521/920)

Preparing a nonpolyurethane cellular particle from a nonparticulate material (Class 521/921)

Class-related foreign documents (Class 521/FOR000)