US PATENT SUBCLASS 521 / 29
.~.~ Polymer characterized by defined size or shape other than bead or pearl

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
25  DF  .~ ION-EXCHANGE POLYMER OR PROCESS OF PREPARING {7}
29.~.~ Polymer characterized by defined size or shape other than bead or pearl

DEFINITION

Classification: 521/29

(under subclass 25) Subject matter wherein the ion-exchange polymer is characterized by having a defined size or shape.

(1) Note. This subclass provides for (1) processes of producing ion-exchange polymers having defined shape or dimension, or (2) for ion-exchange polymer having a desired shape or dimension.

(2) Note. Ion-exchange polymers having a defined shape produced by suspension polymerization (bead or pearl) are excluded from this subclass and are classified below on the basis of the particular reactants polymerized.

(3) Note. Included in this subclass are ion-exchange polymers having defined geometric shape such as spherical, granular, filamental, etc.

SEE OR SEARCH CLASS

428, Stock Material or Miscellaneous Articles, for a particular ion-exchange polymer having a defined dimension or for ion-exchange polymers having structure sufficient for placement in that class.