IMPROVEMENTS IN THE MANUFACTURE OF LEATHER, AND IN COMPOUNDS TO BE USED THEREFOR
Year: 1879

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Solicitors, at Frankfort on the Main, in the Empire of Germany, for the
Invention of "IMPROVEMENTS IN THE MANUFACTURE OF LEATHER, AND IN
COMPOUNDS TO BE USED THEREFOR." A communication from Friedrich
Knapp, Doctor of Philosophy and Professor, a person resident at Brunswick,
in the Empire of Germany.
"
Sealed the 14th May 1880, and dated the 29th November 1879.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 29th November 1879.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany. "IMPROVEMENTS IN THE
MANUFACTURE OF LEATHER, AND IN COMPOUNDS TO BE USED THEREFOR." [A
communication from Friedrich Knapp, Doctor of Philosophy and Professor, a person
resident at Brunswick-in the Empire of Germany.]
This Invention relates to further improvements in the method of manufacturing
leather described in the Specification of former Letters Patent granted to me the
Ninth day of July AD 1877, No. 2634, and comprises treating the leather with
albuminous substances; the same forming compounds or precipitates with the iron
salt, as hereinafter described.
According to my present Invention I produce tanned leather by using the
proved iron salt described in my Provisional Specification filed at the Office of
the Commissioners of Patents this 29th day of November, A.D. 1879, No. 4891.
The manipulation is in other respects the same as described in the Specification
of my said former Letters Patent of 1877, No. 2034, except that I treat the leather
with albuminous substances of any kind, as, for instance, blood, in such a manner
that they form a precipitate and compound with the peroxide of iron of the tapping
salt

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 28th May
1880.
A
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at
Frankfort-on-the-Main, in the Empire of Germany. IMPROVEMENTS IN THE
⚫MANUFACTURE OF LEATHER, AND IN COMPOUNDS TO BE USED THEREFOR."
communication from Friedrich Knapp, Doctor of Philosophy and Professor, a person
resident at Brunswick, in the Empire of Germany.
This Invention relates to further improvements in the method of manufacturing
leather described in the Specification of former Letters Patent granted to me the
9th day of July, A.D. 1877, No. 2634, and comprises the treatment of hides or
skins with the improved solution of sulphate of peroxide of iron described in the
Specification of my former Letters Patent dated the 29th day of November,
A.D. 1879, No. 4891, and with albuminous substances. The currying of the hides
or skins by the above named solution of iron is performed in precisely the same
manner as described in the Specification of the said former Letters Patent, No. 2634,
with the exception that I now treat the leather with albuminous substances of any
kind, as, for instance, blood, these substances forming compounds and precipitates
with the per-oxide of iron of the tanning salt. The finishing off is done by the
means and in the manner set forth in the aforesaid Specification, No. 2634.
Having thus fully described the said Invention, and the manner of performing
the same, I wish it understood that I claim,—
First. The process of treating hides or skins with the said new solution of iron
consisting of peroxide of iron, soda, and sulphuric acid.
Second. The process of tanning hides or skins by albuminous substances and by
means of the compounds and precipitates which albuminous substances produce in
connection with the said new iron salt.
Third. The treatment of leather which has been prepared with the above
mentioned solution of sulphate of peroxide of iron by currying and finishing the
same as described in the Specification No. 2634, A.D. 1877.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand
and seal, this Twenty first day of May, in the year of our Lord One thousand
eight hundred and eighty.