US PATENT SUBCLASS 556 / 24
.~.~.~ Exactly four chalcogens bonded directly to the phosphorus (e.g., phosphates, orthophosphates, 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}
13  DF  .~.~ Phosphorus containing {6}
24.~.~.~ Exactly four chalcogens bonded directly to the phosphorus (e.g., phosphates, orthophosphates, etc.) {2}
25  DF  .~.~.~.~> At least two of the chalcogens are sulfur (e.g., zinc dihydrocarbyl dithiophosphates, etc.)
26  DF  .~.~.~.~> Nitrogen or -C(=X)- containing, wherein X is chalcogen

DEFINITION

Classification: 556/24

(under subclass 13) Compounds wherein exactly four chalcogens (i.e., oxygen, sulfur, selenium or tellurium) are bonded directly to the phosphorus.

(1) Note. Examples of compounds provided for herein are: [figure]