US PATENT SUBCLASS 556 / 42
.~.~ Vanadium, niobium, or tantalum containing (V, Nb, or Ta)


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}
42.~.~ Vanadium, niobium, or tantalum containing (V, Nb, or Ta) {2}
43  DF  .~.~.~> Carbon bonded directly to the metal (e.g., cyclopentadienyl vanadium tetracarbonyl, etc.)
44  DF  .~.~.~> The metal is bonded directly to X of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens (e.g., vanadyl xanthate, etc.)


DEFINITION

Classification: 556/42

(under subclass 1) Compounds which contain vanadium, niobium or tantalum.

(1) Note. Niobium has also been known as columbium.