IMPROVEMENTS IN SAFETY ENVELOPES
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said Warren William De la
Rue at the Office of the Commissioners of Patents on the 20th October
1881.
WARREN WILLIAM DE LA RUE, of 110, Bunhill Row, in the County of Middlesex.
"IMPROVEMENTS IN SAFETY ENVELOPES."
This Invention has for its object improvements in safety envelopes.
My improved safety envelope consists in effect of two complete envelopes, the
one enclosed within the other.
The inner envelope is of Jaconette, or like woven fabric. It has the opening at
one end, and the joint is along the middle of the back and through the free flap.
The fixed flap closing, the bottom is folded to the back, so that both the joints of
this inner envelope are upon the back.
These joints are securely fastened by adhesive material or by stitching, so that
the inner envelope or lining is complete in itself.
The paper for the outer envelope is cut in the usual way for an envelope, open
at the end; all its flaps are arranged to fold to the front.
This paper envelope, in its unfolded form, is coated with paste, and the completed
inner envelope of woven fabric is laid in place upon it. The bottom flap and
afterwards the side flaps of the paper envelope are then folded over and pressed
down flat. In this state the compound envelope is dried, and afterwards the inner
envelope is opened by inserting a paper knife. The paste does not cause the two
surfaces of woven fabric to adhere firmly the one to the other, but does attach the
fabric very securely to the paper.
When the inner envelope or lining is thus covered and the whole is complete,
access to the joints of the lining can only be attained by means involving the
irrenarable destruction of the outer envelope.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Warren William De la Rue in the Great Seal Patent Office on
the 19th April 1882.
WARREN WILLIAM DE LA RUE, of 110, Bunhill Row, in the County of Middlesex.
"IMPROVEMENTS IN SAFETY ENVELOPES."
This Invention has for its object improvements in safety envelopes.
My improved safety envelope consists in effect of two complete envelopes, the
one enclosed within the other.
The inner envelope is of Jaconette, or like woven fabric. It has the opening at
one end, and the joint is along the middle of the back and through the free flap.
The fixed flap closing, the bottom is folded to the back, so that both the joints of
this inner envelope are upon the back.
These joints are securely fastened by adhesive material or by stitching, so that
the inner envelope or lining is complete in itself.
The paper for the outer envelope is cut in the usual way for an envelope open
at the end; all its flaps are arranged to fold to the front.
This paper envelope, in its unfolded form, is coated with paste, and the completed
inner envelope of woven fabric is laid in place upon it. The bottom flap and
afterwards the side flaps of the paper envelope are then folded over and pressed
down flat. In this state the compound envelope is dried, and afterwards the inner
envelope is opened by inserting a paper knife. The paste does not cause the two
surfaces of woven fabric to adhere firmly one to the other, but does attach the
fabric very securely to the paper.
When the inner envelope or lining is thus covered and the whole is complete,
access to the joints of the lining can only be attained by means involving the
irreparable destruction of the outer envelope.
In order that my said Invention may be most fully understood and readily
'carried into affect I will ncceed to deconibe the Drawings homunts annexed