IMPROVED MANUFACTURE OF ARTICLES FROM VULCANIZED RUBBER
Year: 1875

page_text: LETTERS PATENT to Hiram Pond Dunbar and Thomas Church
.
Lothrop, of Boston, in the County of Suffolk, and State of Massa-
chusetts, in the United States of America, for the Invention of
COMPLETE SPECIFICATION filed by the said Hiram Pond Dunbar
and Thomas Church Lothrop at the Office of the Commissioners of
Patents, with their Petition and Declaration, on the 17th December
1875, pursuant to the 9th Section of the Patent Law Amendment
Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, WC, HIRAM
POND DUNBAR and THOMAS CHURCH LOTUROP, of Boston, in the
County of Suffolk and State of Massachusetts, in the United States of
America, send greeting.
WHEREAS we are in possession of an Invention for "IMPROVED
MANUFACTURE OF ARTICLES FROM VULCANIZED RUBBER," and, have petitioned
Her most Excellent Majesty Queen Victoria, to grant unto us, our

page_text: action of rollers or other pressure, it being understood that both the
base or backing A and the strips a, a, etc., are in the plastic semi-pulpy
condition incident to the manufacture of rubber goods at this stage.
The pressure of the rolls causes the ribbons a, a, etc., to imbed them-
selves in the body of the backing A so that a uniformly plane surface
common to all results, and in this condition the whole is subjected to
the vulcanizing process. By this method, that is, the employment of a
body of cheap material, not susceptible of being colored, covered wholly
or in part with a comparatively thin surface of a much finer preparation
or compound which is susceptible of receiving and retaining brilliant
colors we are enabled to supply at comparatively low cost a very durable
and ornamental product, and to make available and adapt to many uses
in the arts a product which has heretofore been in comparatively small
demand and employed mainly in packing.
To manufacture the entire product from a compound sufficiently finc
or containing the requisite amount of pure rubber to receive and retain
distinct or vivid colors would be impracticable owing to its high cost.
By our method we obtain all the desirable effects as regards ornamental
appearance and durability of a fine material at a cost but little in excess
of a cheap material.
We do not confine ourselves to the form, character, or extent of the
outer surfacing of fine material which we employ, as this may be varied
greatly without departing from the spirit and intent of our Invention,
as for instance in many ornamental objects, figures, or characters in any
elaborate designs may be provided. We have shown in the present
instance a floorcloth as being the representative of one valuable result of
our Invention.
First. The improved manufacture of rubber products, substantially as
herein described, that is the uniting with a base or foundation of cheap
material a facing or series of strips or designs of finer material sus-
ceptible of receiving colors and incorporated with the foundation,
substantially as and for purposes stated.

page_text: parallel strips in colors or neutral tints composed of a finer quality of
rubber compound, substantially as and for purposes stated.
In witness whereof, we, the said Hiram Pond Dunbar and Thomas
Church Lothrop, have hereunto set our hands and seals, this
Second day of December, 1875.
HIRAM POND DUNBAR.
(L.S.)
THOMAS CHURCH LOTHROP. (L)s.