Gas separation: apparatus – Electric field separation apparatus – Including gas flow distribution means
Patent
1977-05-06
1978-12-05
Kelley, Mary F.
Gas separation: apparatus
Electric field separation apparatus
Including gas flow distribution means
96 3, 96 29R, 96 66R, 96 95, G03C 530, G03C 106, G03C 554
Patent
active
041284259
ABSTRACT:
In one embodiment, the present invention relates to pyrazolidine derivatives, some of which are novel compounds, all of which are represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 taken individually, the same or different, are each hydrocarbon moieties containing up to about 20 carbon atoms selected from alkyl, aryl, aralkyl and alkaryl, which moieties may be unsubstituted or substituted with a substituent selected from carboalkoxyalkyl, aryl, alkyl, alkoxy, hydroalkyl, aminoalkyl, ketalalkyl and acetalalkyl, and R.sup.1 and R.sup.2 taken together represent the carbon atoms necessary to complete a cyclic moiety selected from: ##STR2## which cyclic moieties may be unsubstituted or substituted with the above-identified substituents; Y is --OH or --NH.sub.2 ; and X is --OH, --NH.sub.2, --NH.sub.2.Z where Z is a salt, or --NHR where R is alkyl or aryl.
In another embodiment, the present invention is directed to the use of the above-denoted class of compounds as photographic silver halide developing agents and to photographic processes, products and compositions employing the same.
REFERENCES:
patent: 930091 (1909-08-01), Scheitlin
patent: 2163781 (1939-06-01), Eggert
patent: 3012884 (1961-12-01), DERamaix
patent: 3767400 (1973-10-01), Hayakawa et al.
patent: 4061498 (1977-12-01), Monbaliu
Wiley & Wiley, Pyrazolones, Pyrazolidones & Derivatives, 1964, pp. 46-64, 76-81, 115-122, 123-138.
Bennett Doris M.
Kelley Mary F.
Maccarone Gaetano D.
Polaroid Corporation
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