摘要:
New silver dye-bleach catalysts and the process for their manufacture are provided. These compounds have the general formula ##STR1## wherein A is an electron-withdrawing group and R.sub.1 and R.sub.2 are hydrogen, optionally substituted alkyl or optionally substituted aryl.
摘要:
Novel dyestuffs containing amino or imino groups and their preparation are provided.These dyestuffs have the general formula ##STR1## wherein R is --N(R.sub.3)CH.sub.2 --Z or --N.dbd.CH--Z, X is N or CR.sub.6 where R.sub.6 is a hydrogen atom or an optionally substituted alkyl or aryl group, Y is S.sup..sym., O.sup..sym., N or N.sup..sym. R.sub.7 where R.sub.7 is a hydrogen atom or an optionally substituted alkyl or aryl group, R.sub.1, R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, or R.sub.1 and R.sub.2 together with the nitrogen atom complete a heterocyclic ring, or one of R.sub.1 and R.sub.2 can be hydrogen and the other of R.sub.1 and R.sub.2 can be aryl, Z is a group which comprises both an activating group which contains at least one double bond system and also a ballasting group and R.sub.4 and R.sub.5 each represent optional substituents or form an annelated benzene ring. The new dyestuffs are useful in the photographic field especially in the photographic dye diffusion transfer process for the production of photographic images.
摘要:
The new compounds of the general formula ##STR1## where R.sub.1 is hydrogen, alkyl or cyclic alkyl, R.sub.2 and R.sub.3 are each hydrogen, alkyl, a carboxylic acid, ester or amide group or cyano, and R.sub.4, R.sub.5 and R.sub.6 are each alkyl or aryl, are useful as antihalation dyes and as image dyes in photographic materials for dye-bleaching processes.
摘要:
New silver dye-bleach catalysts and the process for their manufacture are provided. These compounds have the general formula ##STR1## wherein A is an electron-withdrawing group and R.sub.1 and R.sub.2 are hydrogen, optionally substituted alkyl or optionally substituted aryl.
摘要:
According to the present disclosure, a digital vehicle microphone system for recording and playback of announcements pertaining to vehicle stops and route information is provided for use over public address systems installed on public transportation vehicles. The system includes a microphone apparatus for digitally pre-recording the announcements. The microphone apparatus includes a microphone, a mute switch, a radio mode switch, a record switch and a record indicator. The system also includes a control circuit for recording and storing at least two separate announcements onto memory storage devices. The control circuit further includes a delayed playback feature for delayed playback of the announcements through the vehicle's public address system. The microphone apparatus further includes a “hands free” microphone including hand and foot actuated recording switches. The hand actuated record switch is used to record the vehicle's route information and the foot actuated record switch is used to record the vehicle's upcoming stop announcements. A method of operating a vehicle public address system is also disclosed.
摘要:
An automatic audio message delivery device is associated with the operation of an automatic door at a retail establishment. Data communications are provided to update promotional messages to be delivered and to enable the device to centrally report information on message delivery traffic and service requirements of the automatic door.