The Application of Certain Waste Materials for the Production of a New or Improved "Mineral White," and Improvements in the Process of Manufacture.
Year: 1890

page_text: Date of Application, 1st Aug., 1890
Complete Specification Left, 21st Apr., 1891-Accepted, 23rd May, 1891
PROVISIONAL SPECIFICATION.
The Application of Certain Waste Materials for the Production of a
New or Improved "Mineral White," and Improvements in the
Process of Manufacture.
1, JOHN JOSEPH LEE, of 126 Halliwell Lane, Cheetham Hill, Manchester, in
the County of Lancaster, Builders Merchant, do hereby declare the nature of the
said invention to be as follows:-
Plaster of paris is made into moulds which are used in the manufacture of
pottery and for other purposes and such moulds are sometimes subjected to more or
less heat and are finally rejected as waste.
My invention consists in applying such waste moulds or parts of moulds which
have been made from plaster of paris, or in applying plaster of paris which has
become solid by the application of water, and rejected as waste material for the
production of what is well known in commerce as "mineral white" which is used
in the manufacture of paper, and wall papers and for other manufacturing purposes;
the ordinary mineral white of commerce being made from gypsum in a well known
manner.
The waste moulds are generally more or less discoloured on their interior and
exterior surfaces, and the material of which they are composed may vary more or
less in colour or whiteness. The waste moulds or pieces of moulds by my invention
are sorted into qualities, then if desired and by preference, the exterior and interior
surfaces of the moulds or parts of moulds are scraped, brushed or scrubbed or
otherwise treated to remove the discoloured surfaces. This is or may also be
effected by placing the moulds or parts of moulds in a cylinder with sharp sand or
fine gravel or other similar suitable material, the cylinder being then rotated for a
sufficient time to scrub the discoloured skin away, the moulds and sand are or may
be then separated by riddling or other means.
The cleaned moulds or parts of moulds are or may be then broken up into small
pieces, and if desired may be subjected to heat, and then the small pieces are ground
by any suitable means into fine powder, forming the new or improved "mineral
white.'
5>
Dated this 31st day of July 1890
PETER J. LIVSEY,
Agent.
COMPLETE SPECIFICATION.
The Application of Certain Waste Materials for the Production of a
New or Improved "Mineral White," and Improvements in the
Process of Manufacture.
I, JOHN JOSEPH LEE, of 126 Halliwell Lane, Cheetham Hill, Manchester, in
the County of Lancaster, Builders Merchant, 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:-
Plaster of paris is made into moulds which are used in the manufacture of
pottery and for other purposes and such moulds are sometimes subjected to more or
less heat and are finally rejected as waste.
My invention consists in applying such waste moulds or parts of moulds which
have been made from plaster of paris, or in applying plaster of paris, which has
become solid by the application of water, and rejected as waste material, for the
[Price 4d]

page_text: production of what is well known in commerce as "mineral white" which is used
in the manufacture of paper and wall papers and for other manufacturing purposes,
the ordinary mineral white of commerce being made from gypsum in a well known
manner.
The waste moulds are generally more or less discoloured on their interior and
exterior surfaces, and the material of which, they are composed may vary more or
less in colour or whiteness. The waste moulds or pieces of moulds by my invention
are sorted into qualities, then if desired and by preference, the exterior and interior
surfaces of the moulds or parts of moulds, are scraped, brushed or scrubbed or
otherwise treated, to remove the discoloured surfaces. This is or may also be
effected by placing the moulds or parts of moulds in a cylinder with sharp sand or
fine gravel or other similar suitable material, the cylinder being then rotated for a
sufficient time to scrub the discoloured skin away, the moulds and sand are or may
be then separated by riddling or other means.
The cleaned moulds or parts of moulds are or may be then broken into small
pieces, and if desired may be subjected to heat, and then the small pieces are
ground by any suitable means into fine powder, forming the new or improved
mineral white."
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is.
The new manufacture of "mineral white" produced, substantially in the manner
herein described from waste moulds or parts of moulds formed of plaster of paris,
or from waste plaster of paris which has become set or hardened.
Dated this Twentieth day of April 1891.
PETER J. LIVSEY,
Agent.