US PATENT SUBCLASS 556 / 141
.~.~.~.~ Chalcogen double bonded directly to the carbon (e.g., butadiene iron tricarbonyls, etc.)

Current as of: June, 1999
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556 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {3}
1  DF  .~ HEAVY METAL CONTAINING (e.g., Ga, In or T1, etc.) {19}
138  DF  .~.~ Iron, cobalt, or nickel containing (Fe, Co, or Ni) {3}
140  DF  .~.~.~ Carbon bonded directly to the metal {2}
141.~.~.~.~ Chalcogen double bonded directly to the carbon (e.g., butadiene iron tricarbonyls, etc.) {1}
142  DF  .~.~.~.~.~> Carbocyclic ring bonded directly to the metal

DEFINITION

Classification: 556/141

(under subclass 140) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is double bonded directly to the carbon.

(1) Note. An example of a compound provided for herein is: [figure]