US PATENT SUBCLASS 430 / 173
.~.~.~.~ At least two couplers

Current as of: June, 1999
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430 /   HD   RADIATION IMAGERY CHEMISTRY: PROCESS, COMPOSITION, OR PRODUCT THEREOF

141  DF  DIAZO REPRODUCTION, PROCESS, COMPOSITION, OR PRODUCT {7}
154  DF  .~ Composition or product which contains radiation sensitive compound having moiety of nitrogen double or triple bonded directly to nitrogen other than chromophore moiety, e.g., triazene containing product, etc., process of making, and composition or product used to finish or develop a diazo reproduction {3}
170  DF  .~.~ Radiation-sensitive composition {4}
171  DF  .~.~.~ Diazonium compound containing {9}
173.~.~.~.~ At least two couplers {1}
174  DF  .~.~.~.~.~> Includes additional adjuvant other than acidic stabilizer

DEFINITION

Classification: 430/173

At least two couplers:

(under subclass 171) Compositions containing at least two different compounds which function as couplers for dye formation. The coupler compounds have auxochromic groups or are capable of producing auxochromic groups. Often times, the auxochromic group is a hydroxy substituent directly attached to an aromatic nucleus.