US PATENT SUBCLASS 525 / 331.7
.~.~.~.~ Ethylene-propylene terpolymer, e.g., EPT, EPDM, EPR, etc.

Current as of: June, 1999
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525 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {4}
50  DF  .~ MIXING OF TWO OR MORE SOLID POLYMERS; MIXING OF SOLID POLYMER OR SICP WITH SICP OR SPFI; MIXING OF SICP WITH AN ETHYLENIC AGENT; MIXING OF SOLID POLYMER WITH A CHEMICAL TREATING OR ETHYLENIC AGENT; OR PROCESSES OF FORMING OR REACTING; OR THE RESULTANT PRODUCT OF ANY OF THE ABOVE OPERATIONS {32}
55  DF  .~.~ At least one solid polymer derived from ethylenic reactants only {25}
326.1  DF  .~.~.~ Chemically after treated solid polymers derived from ethylenically unsaturated monomers only {24}
331.7.~.~.~.~ Ethylene-propylene terpolymer, e.g., EPT, EPDM, EPR, etc. {1}
331.8  DF  .~.~.~.~.~> Sulfur containing chemical treating agent

DEFINITION

Classification: 525/331.7

Ethylene-propylene terpolymer, e.g., EPT, EPDM, EPR, etc.:

(under subclass 326.1) Product wherein the solid polymer which has been chemically modified is an ethylene-propylene terpolymer.

(1) Note. An ethylene-propylene terpolymer has at least one monomer in addition to ethylene and propylene.

(2) Note. Ethylene-propylene terpolymers are often described as ethylene-propylene terpolymer rubber (e.g., EPT OR EPDM rubber).

(3) Note. Chemically modified material solely described as ethylene-propylene rubber (EPR) is placed herein as a terpolymer since a rubber is to be treated as a diene polymer in the absence of disclosure to the contrary

SEE OR SEARCH THIS CLASS, SUBCLASS:

333.1, for material solely described as a rubber or elastomer and presumed to be a diene rubber.

333.7, for chemically modified copolymer of ethylene with propylene.