The Use of Aromatic Amido Compounds and of Derivatives of Pyrogallol for the Development of Photographic Images.
Year: 1891

page_text: Date of Application, 27th Nov., 1891
Complete Specification Left, 2nd Aug., 1892-Accepted, 17th Sept., 1892
PROVISIONAL SPECIFICATION.
The Use of Aromatic Amido Compounds and of Derivatives of
Pyrogallol for the Development of Photographic Images.
I, JULIUS HAUFF, of Feuerbach, near Stuttgart, Germany, Manufacturer,
do hereby declare the nature of this invention to be as follows:-
I have discovered that the orthoamido-cresols which are distinguished from the
para compounds by their greater solubility are particularly suitable for the develop-
ment of photographic images.
I may also use for the same purpose, glycines of the amidophenols, a series of
alkyl, benzyl, phenyl, and oxyphenyl combinations of the amidophenols, as well as
B). Mono and di propyl, amyl, benzyl, phenyl, oxyphenyl, as well as methyl-
ethyl derivatives of:
1. o-amidophenol
2. p-amidophenol
3. o-amido-m-cresol
4. In-amido-o-cresol
5. m-amido-(-) in-xylenol
6. m-amido-p-xylenol
7. o-amido-(v-) o-xylenol
8. o-amido-(s-) m-xylenol
The above compounds are used in half or one per cent. solutions in combination
with sulphite of soda, carbonated or caustic alkalies, for the development of photo-
graphic images.
3. Glycines of the following ortho and para amidophenols of the com-
position C.Ho OH. NRCH,COOH.
A). of the amidophenols
1. o-amidophenol
2. p-amidophenol
3. (v-) m-amido-o-cresol
4. (s-) p-amido-m-cresol
5. (v-) o-amido-m-cresol
6am-amido-n-cresol

page_text: 2. Alkyl, benzyl, and phenyl derivatives of ortho and para amidophenols of the
composition CH OH. NŔ'R':
A). Mono and di methyl, ethyl, propyl, amyl, benzyl, phenyl, oxyphenyl, as
well as methylethyl derivatives of:
1. (v-) m-amido-o-cresol
2.
(s-) p-amido-m-cresol
3. (v) o-amido-m-cresol
4. (a-) m-amido-p-cresol
Mono and d propyl, amyl, benzyl, phenyl, oxyphenyl, as well as
thylethyl derivatives of:
1. o-amidophenol-
2. p-amidophenol.

page_text: H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Julius Hauft.
COMPLETE SPECIFICATION.
The Use of Aromatic Amido Compounds and of Derivatives of
Pyrogallol for the Development of Photographic Images.
I, JULIUS HAUFF, of Feuerback near Stuttgart, Germany, Manufacturer,
do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
This invention has for its object the use for developing latent photographic
images or views of substituted amido-phenols which have the property of dissolving

page_text: readily in carbonates of the alkalics. These compounds belong to the "glycine "
class and are produced by replacing an atom of hydrogen in the group NH, of the
amidophenol by an acetic acid residuum. The typical formula for these com-
pounds is:
pounds is :—
CHOH.NR.CH,COOH.
These compounds are the glycines of the following amido-phenols:
1.) p-amidophenol
2.) o-amido-m-cresol
3.) m-amido-o-cresol
4.) m-amido-(v-) m-xylenol
5.) m-amido-p-xylenol
6.) o-amido-(v-) o-xylenol
7.) o-amido-(s-) m-xylenol
These compounds are used in solution with sulphites and carbonates of the
alkalies for the purpose of developing latent photographic images or views.
For instance, I dissolve in 100 cub. cent. of water, 4 gram. of crystallized
sulphite of soda, 14 gram. of glycine and 2 gram. of potash, this compound
forming a developing means particularly suitable for the development of landscapes.
For portraits and the like, the solution may be concentrated or further diluted
according to the temporary conditions as to light, plates &c.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The use of the glycines of the following amido-phenols for the development of
the photographic views or images in layers containing halogen silver
1.) p-amidophenol
2.) o-amido-m-cresol
3.) m-amido-o-cresol
4.) m-amido-(v-) m-xylenol
5.) m-amido-p-xylenol
6.) o-amido-(v-) o-xylenol
7.) o-amido-(s-) m-xylenol.