US PATENT SUBCLASS 556 / 148
.~.~.~.~.~ Nitrogen containing (e.g., ferric chelates of ethylenediaminetetracetic acid, 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}
146  DF  .~.~.~ Chalcogen bonded directly to the metal {2}
147  DF  .~.~.~.~ The chalcogen is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens {2}
148.~.~.~.~.~ Nitrogen containing (e.g., ferric chelates of ethylenediaminetetracetic acid, etc.)

DEFINITION

Classification: 556/148

(under subclass 147) Compounds which contain nitrogen.

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