An Improved Envelope.
Year: 1888

page_text: Date of Application, 19th July, 1888
Complete Specification Left, 7th Nov., 1888
Complete Specification Accepted, 7th Dec., 1888
RESERVE C
An Improved Envelope.
I, KHURSED MANEKJI TATA of Navsari, near Bombay, India, temporarily residing
at Glendower Hotel 17 Harrington Road, South Kensington in the County of
Middlesex, Merchant, do hereby declare the nature of this invention to be as
follows:
This invention has for its object to provide an envelope by which greater security
to the contents is afforded, and which cannot be opened by steaming or otherwise
surreptitiously without detection.
Envelopes constructed according to this invention, are provided with an enlarged
back flap, gummed upon the reverse side to the side ordinarily gummed, to be folded
inside the back of the envelope and affixed to the inside thereof. The inside of the
back of the envelope is also gummed so that it may be made to adhere to the said
back flap, or it may be produced and folded over so as to adhere to the front of the
envelope at the top thereof. Or the back flap may be so made that a part thereof
will fold over the outside of the back of the envelope and be gummed thereto in the
ordinary manner, or passed through a slit therein and gummed to the inside of the
back of the envelope.
The gum used upon the envelopes may if desired be coloured with a suitable
dye, the action of steam, or hot water upon which will cause the colour to run and
so damage the envelope.

page_text: I, KHURSED MANEKJI TATA, of Navsari, near Bombay, India 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:
This invention has for its object to provide an envelope by which greater security
to the contents is afforded and which cannot be opened by steaming or otherwise
surreptitiously without detection.
Envelopes constructed according to this invention, are provided with an enlarged
back flap, gummed on the reverse side to the side ordinarily gummed to be folded
inside the back of the envelope and affixed to the inside thereof. The back of the
envelope is produced and folded over so as to adhere to the front of the envelope at
the top thereof.
And in order that my invention may be more fully understood and carried into
practice, I will now proceed to describe the same with reference to the accompanying
drawings in which similar letters indicate corresponding parts throughout.
Figure 1 shows in perspective an envelope constructed according to this invention.
Figure 2 is a view of the inside of the envelope before it is made up.
Figure 3 is a back view of the envelope ready for the contents.
Figure 4 is a front view of the same when fastened up; and,
Figure 5 is a section on the line xx Figure 3.
The envelope is cut of the shape shewn in Figure 2 the part; being exactly of a
size with the back piece h. The small flap n and the edge m of the flap g are gummed
upon reverse sides. As in Figure 2 that part of the envelope which is intended to be
the inside is uppermost; the small flap n is gummed on the upper side and the edge m
is gummed on the under or reverse side. The edges of the side flaps k and are also
gummed upon their upper sides in the ordinary manner.
In making the envelope the back piece is folded along the line ab on to the
part j. the flaps and are then folded along b d and a c on to the back piece h and
affixed thereto by moistening the gum, one flap k or slightly overlapping the other.
in the ordinary manner thus forming the back of the envelope: The envelope is now
ready for the contents as shewn in Figure 3.
The letter, note or other contents having been inserted the envelope is secured in
the following manner :-the gum m upon the under or reverse side of the flaps g, is
moistened and the said flap g is then folded along the line c d and passed inside the
back piece so that the contents are between the part j and the side flaps g and the
gum m is contiguous to the inside of the back piece h to which it is now made to
adhere by pressure from the hand or otherwise.
The envelope is now turned over so that the front or face j¹ is uppermost ; the
small flap n is now folded along the line e f and the gum on the small flap n moistened
and affixed to the front of the envelope as shewn in Figure 4.

page_text: 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 :-
An envelope with four flaps, three of which k land n are gummed upon one side whilst
the other flap g is gummed upon the reverse side the whole constructed substantially
as and for the purpose hereinbefore set forth and illustrated in the accompanying
drawings.