Improvements in or relating to the Manufacture of Cement, applicable for Uniting Porcelain, Glass, Metal and other Substances, for the Manufacture of Electric Glow Lamps, and for Dental and other Purposes.
Year: 1899

page_text: Date of Application, 11th Oct., 1899
Complete Specification Left, 6th July, 1900-Accepted, 15th Sept., 1900
No text detected.
Improvements in or relating to the Manufacture of Cement, applicable
for Uniting Porcelain, Glass, Metal and other Substances, for the
Manufacture of Electric Glow Lamps, and for Dental and other
Purposes.
1, FRANZ SEHR, Mechanical Engineer, of Blankenhain, near Weimar, Germany,
do hereby declare the nature of this invention to be as follows:-
The present invention relates to the production of a so-called water-glass-cement,
the said cement offering the advantage over the cements known at present, made
of water-glass and burnt clay, of utilizing the breakages and waste in porcelain
manufacturies, i.e., hard-porcelain fragments, and half burnt porcelain fragments
reduced to powder and mixed with feldspar.
This use of waste material is of great importance to china-ware manufacturers,
since they already possess the machinery necessary for crushing and grinding the
fragments. Further the cement obtained from such material is snow-white in
appearance, of constant, uniform quality, and of extraordinary hardness, and is
eminently suitable for cementing porcelain, glass and the like, and in special cases
also for cementing these substances to metal and other bodies.
The cement is made by mixing a powder consisting of a mixture of ground hard
porcelain fragments, half burnt porcelain fragments and feldspar, with soda water-
glass, so as to form a paste.
"
The term hard porcelain fragments," applies to fragments of fully burnt hard
porcelain, while "half-burnt porcelain" fragments are those resulting from break-
age of porcelain which has been exposed to the first heat only. Swedish feldspar may
be used as the other ingredient.
These substances are ground to a very fine powder and intimately mixed, and
the powder, when required as a cement is moistened with soda water-glass and
worked into a paste and quickly applied. Experience has shown that the ingre-
dients, when mixed in the following proportion, give satisfactory results:-
50 wwwcent hard norcelain.
1
15 per cent. Teluspas.
The cement may be produced at a very low price; it very quickly sets and will
withstand heat and water. Its cementing power for porcelain, glass and metal
is very great, and articles thus cemented rarely break again along the cemented
line.
The cement is of very close texture or grain, and is a non-conductor of electricity.
The new and essential characteristic feature of the invention is the employment
of burnt porcelain fragments or waste with feldspar, for only the use of burnt por-
celain ensures a cement of close grain and rapid setting quality.
The new cement is eminently suitable for use in electric glow lamps, instead

page_text: of the plaster of Paris used at present. The cement is not much dearer than
plaster of Paris, but owing to its more rapid setting the lamps are sooner ready for
use and handling, while the drawbacks associated with the use of plaster of Paris
such as unevenness in setting, want of strength and resistance against damp, high
temperatures, and noxious gases are absent in the improved cement.
The cement may be used for any other purpose where cement is used, as for
instance as a tooth-filling or cement.
Dated this 11th day of Ontober 1900.
BOULT, WADE & KILBURN,
Agents for the Applicant.
Improvements in or relating to the Manufacture of Cement, applicable
for Uniting Porcelain, Glass, Metal and other Substances, for the
Manufacture of Electric Glow Lamps, and for Dental and other
Purposes.
I, FRANZ SEHR, Mechanical Engineer, of Blankenhain, near Weimar, Germany,
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:
The present invention relates to the production of a so-called water-glass-cement,
the new cement offering the advantage over the known cements made of water-
glass and burnt clay, that more or less waste material can be utilized, i.e., the
breakages and waste in porcelain manufactories, consisting of hard-porcelain
fragments and partly burnt porcelain fragments which are reduced to powder and
mixed with feldspar.
This use of waste material is of great importance to china-ware manufacturers,
since they already possess the machinery necessary for crushing and grinding the
fragments. Further the cement obtained from such material is snow-white in
appearance, of constant, uniform quality, and of extraordinary hardness, and is
eminently suitable for cementing porcelain, glass and the like, and in special cases
also for cementing these substances to metal and otlier bodies.
The cement is made, by mixing a powder consisting of a mixture of ground hard
porcelain fragments, half or partly burnt porcelain fragments and feldspar, with
a binding agent such as soda water-glass, so as to form a paste of the desired
consistency.
The term hard-porcelain fragments applies to fragments of fully burnt hard por-
celain, while half-burnt porcelain fragments are those resulting from breakages
of porcelain which has been exposed to the first heat only. Swedish feldspar may.
be used as the other ingredient.
These substances are ground to a very fine powder and intimately mixed, and
the powder, when required as a cement, is moistened with soda water-glass and
worked into a paste and quickly applied. Experience has shown that the ingre-
dients when mixed in the following proportions, give satisfactory results:
50% hard porcelain.
350 half hount waveslain

page_text: is very great, and articles thus cemented rarely break again along the cemented
line.
The cement is of very close texture or grain and is a non-conductor of electricity.
The new and essential characteristic feature of the invention is the employment
of burnt porcelain with feldspar, for only the use of burnt porcelain ensures a
cement of close grain and rapid setting quality.
The new cement is eminently suitable for use in electric glow lamps, instead
of the plaster of Paris used at present. The cement is not much dearer than the
plaster of Paris, but owing to its more rapid setting the lamps are sooner ready for
use and handling, while the drawbacks associated with the use of plaster of l'aris
such as unevenness in setting, want of strength and resistance to damp, high
temperatures and noxious gases are absent in the improved cement.
The cement may be used for any other purpose where cement is used, as for
instance as a tooth-filling or cement.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. The manufacture of a cement (suitable especially for use in the manufacture
of electric glow lamps) consisting in mixing finely powdered hard porcelain, partly
burnt porcelain and raw feldspar, with water-glass and working the mass into a
paste, substantially as described..
2. A cement consisting of powdered hard porcelain, partly burnt porcelain, and
feldspar, mixed with a binding agent.
:-
3. A cement consisting of approximately:-
50% of powdered hard porcelain.
35% of half burnt porcelain, and
15% of raw feldspar,
mixed with water glass to the desired consistency, substantially as described.
BOULT, WADE & KILBURN,
Agents for the Applicant.