An Improved Safety Envelope.
Year: 1893

page_text: Date of Application, 10th Feb., 1893
Complete Specification Left, 10th Nov., 1893-Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
An Improved Safety Envelope.
JOHN BLACKBURN of Holly Bank, Latchford near Warrington in the County
of Cheshire, Bank Manager, do hereby declare the nature of my invention for AN
IMPROVED SAFETY ENVELOPE to be as follows:-
My invention relates to a safety envelope whereby absolute safety is ensured
against opening without detection. The said invention consists mainly of two flaps
overlapping (and gummed) to form the body of the envelope. Thence a continuation
of the back of the envelope brought (and gummed) entirely over the aforesaid
flaps, at right angles. The closing or completing of the envelope (at the face)
being attained by simply folding over the opposite short continuation of the back
of the envelope. A small connecting piece (gummed) to connect the two aforesaid
overlapping pieces to the inside of the last named continuation, may be used to
further render opening without detection an impossibility.
Perforated or other marks letters or figures are made to go through the closing
flap of the envelope, and through the entire envelope if desired. The joint formed
by this aforesaid overlap being on the face of the envelope; thus in breaking the
joint, the stamp would be partly or wholly destroyed.
A seal may be affixed over the perforated letters, marks or otherwise, thus sealing
throughout from back to front, by reason of the wax passing through and in the
perforations.
Slight modifications of the shape & arrangement of this safety envelope being
made as circumstances and conditions require. The perforated part is made to clear
the enclosure, for this reason, the envelopes have a clear marginal space.
Dated this Ninth day of February One thousand eight hundred and
ninety three
JOHN BLACKBURN.
COMPLETE SPECIFICATION.
An Improved Safety Envelope.
JOHN BLACKBURN Bank Manager Holly Bank Latchford near Warrington 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:-
My invention relates to a safety envelope whereby absolute safety is ensured
against opening without detection. The said invention consists mainly of two flaps
overlapping (and gummed) to form the body of the envelope. Thence a continuation
of the back of the envelope brought entirely over (and gummed) the aforesaid
flaps at right angles. The closing or completing of the envelope (at the face) being
attained by simply folding over the opposite short continuation of the back of the
envelope. A small connecting piece (gummed) to connect the two aforesaid over-
lapping pieces to the inside of the last named continuation may be used to further
render opening without detection an impossibility.
Perforated or other marks, letters or figures are made to go through the closing
flap of the envelope, and through the entire envelope if desired. The joint formed
by this aforesaid overlap being on the face of the envelope. Thus in breaking the
joint, the stamp would be partly or wholly destroyed.
A seal may be affixed over the perforated letters, marks, or otherwise, thus sealing

page_text: throughout from back to front, by reason of the wax passing through & in the
perforations.
Slight modifications of the shape and arrangement of this safety envelope may be
made as circumstances require.
The perforated part is made to clear the enclosure, for this reason the envelope
has a clear marginal space.
In order that my invention may be clearly understood, I have caused to be
annexed hereto a sheet of drawings illustrative of the invention.
Fig. 1. represents the shape of the paper for the envelope.
Fig. 2. represents the front elevation of the envelope.
Fig. 3. represents the back elevation of same.
In Figs. 1, 2, the two flaps b, c, overlap each other as shewn by the dotted lines,
and are secured together by gumming or otherwise, to form the body of the
envelope. The back a', is brought entirely over and gummed to the aforesaid flaps
at right angles. The completing of the envelope at the face is simply effected by
folding over the continuation of the back, d, at the dotted line, d'¹, Fig. 1.
In Figs. 2, 3, the dotted lines, e, represent the perforations.
In Fig. 1. the portion marked, a, represents the main face of the envelope, which
is closed by the overlapping part, d.
Having now fully described and ascertained the nature of my said invention I
would have it to be understood that what I claim is
1st. In all envelopes, the construction and arrangement of the two overlapping
flaps, b, c, to form the body of the envelope as and for the purpose substantially
described and illustrated.
2ndly. The arrangement of the overlapping or closing flap, d, on the face of the
envelope, as and for the purpose substantially described and illustrated.
3rdly. The form arrangement and construction of envelope, which has a plain,
unjointed back, as substantially described and illustrated.
4thly. The device or arrangement of the perforations, in or through the upper
portion of the envelope as and for the purpose substantially described and
illustrated.
5thly. The form or shape of a sheet of paper for constructing an envelope, as
shewn with reference to Fig. 1. as described and illustrated.
Dated this the 8th day of November 1893.
JOHN BLACKBURN,
Holly Bank, Latchford.