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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)
Description:
Sub-classes under this class:
Class Number
Class Name
Patents
521/25
Ion-exchange polymer or process of preparing
205
521/40
Process of treating scrap or waste product containing solid organic polymer to recover a solid polymer therefrom
188
521/50
Cellular products or processes of preparing a cellular product, e.g., foams, pores, channels, etc.
206
Patents under this class:
Patent Number
Title Of Patent
Date Issued
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