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Class Information
Number: 521/
Name: Synthetic resins or natural rubbers -- part of the class 520 series > Synthetic resins (class 520, subclass 1)

Sub-classes under this class:

Class Number Class Name Patents
521/25 Ion-exchange polymer or process of preparing 307
521/40 Process of treating scrap or waste product containing solid organic polymer to recover a solid polymer therefrom 336
521/50 Cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc. 291

Patents under this class:

Patent Number Title Of Patent Date Issued

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