IMPROVEMENTS IN THE MEANS OF AND IN COMPOSITION FOR IMPREGNATING AND PRESERVING WOOD
Year: 1880

page_text: LETTERS PATENT to Friedrich Hermann Felix Engel, Civil Engineer and
Patent Agent, in the City of Hamburg, Germany, for an Invention of
"IMPROVEMENTS IN THE MEANS OF AND IN COMPOSITION FOR IMPREGNATING
AND PRESERVING WOOD." A communication from Jonas David Francks, of
Hannover, in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Friedrich Hermann Felix
Engel at the Office of the Commissioners of Patents on the 9th July 1880.
FRIEDRICH HERMANN FELIX ENGEL, Civil Engineer and Patent Agent, in the
City of Hamburg, Germany. "IMPROVEMENTS IN THE MEANS OF AND IN
COMPOSITION FOR IMPREGNATING AND PRESERVING WOOD." A communication
from Jonas David Francks, of Hannover, in the Empire of Germany.
This Invention relates to certain improvements in the means of and in compo-
sition for impregnating and preserving wood.
The improved process for impregnating, preserving, and hardening timber, wood,
or articles made of wood, which is the object of this Invention, consists of treating
these materials in the following manner :-The wood, or articles of wood, is or are
placed in a vessel or in a boiler, and is or are either boiled in water or treated by
means of steam admitted into the boiler for a length of time varying with the
dimensions of the parts or articles which are submitted to the operation. The
carbonic acid, resinous and sappy parts which aro thus extracted are then drawn
off, and the wood, either directly after placed in a mixture of lime-water and urine
in the proportions of about five parts of lime-water to one part of urine, or the air
contained in the boiler is furthermore partly removed by means of an air pump,
and then the above liquid is introduced into the boiler, in which latter case the
process of impregnation is accelerated. The liquid introduced into the boiler may
also be put under pressure by means of a pressure pump or other arrangement to
secure a thorough penetration of the preserving liquid into the wood. The wood
or articles of wood after after having cooled off are removed from the vessel or
boiler and dried, or may be dried in the impregnating oven or retort after drawing
off the liquid, such drying being accelerated or not by superheated steam supplied
into the oven or retort.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Friedrich Hermann Felix Engel in the Great Seal Patent Office
on the 8th January 1881.
FRIEDRICH HERMANN FELIX ENOEL, Civil Engineer and Patent Agent, in
the City of Hainburg, Germany. "IMPROVEMENTS IN THE MEANS OF AND IN
COMPOSITION FOR IMPREGNATING AND PRESERVING WOOD." A communication
from Jonas David Francks, of Hannover, in the German Empire.
This Invention relates to certain improvements in the means of and in compo-
sition for impregnating and preserving wood.
The improved process for impregnating, preserving, and hardening timber, wood,
or articles made of wood, which is the object of this Invention, consists of treating
such materials in the following manner:-The wood, or articles of wood, is or are
placed in a vessel of sheet iron or other convenient metal or in a boiler, and is or are
either boiled in water or treated by means of steam admitted into the vessel or
boiler for a length of timo varying with the dimensions of the parts or articles
which are submitted to the operation. The carbonic acid, resinous and sappy
particles, which are thus for most part extracted, are then drawn off, and the wood
is either directly afterwards placed in a mixture of lime-water and urine in the
proportions of about five parts of lime water to ono part of urino, or the air
contained in the boiler is furthermore removed by means of an air pump, and
then the above liquid is introduced into the boiler, in which latter case the process
of impregnation is accelerated. The liquid introduced into the boiler may also be
put under pressure by means of a pressure pump or other arrangement to secure a
thorough penetration of the preserving liquid into the wood. The wood, or articles
of wood, so treated, after having cooled off, are removed from the vessel or boiler
and dried, or may be dried in the impregnating oven or retort after drawing off
the liquid, such drying being accelerated or not by superheated steam supplied into
the oven or retort.
Having now described the nature and particulars of tho said Invention, I
claim,―
The method of impregnating timber, wood, or articles made of wood, by a mixture
of lime water and urine after having treated these materials by steam or boiling
water, substantially in the manner herein described.
In witness whereof, I, the said Friedrich Hermann Felix Engel, have hereunto
set my hand and seal, this Fifth day of January, in the year of our Lord
One thousand eight hundred and eighty one.
A