US1768836A - Envelope - Google Patents

Description

Jdly 1, 1930. T. E. GJORUP 5 ENVELOPE I Original Fi led Jan. 14, 1926 A TTORNE YS Patented July 3. l&@

ED STATES PATENT FICE THOMAS E. GJOE'UP, OF CHICAGO, ILLINOIS, ASSIGNOB-OF ONE-THIRD T FRANK C. VOISINET, OF CHICAGO, ILLINOIS mwmorn provide an envelope in which means is provided for showing at once any attempt to open the envelope. 1 A further object of my invention is to provide an envelope or container having an adhesive which is in condition for immediately sealing the envelope without the use of water, but which will not be devoured by as insects, especially those found in tropical countries which do devour gum, mucllage and glue.

Other objects and advantages will appear in the following specification, and the novel "2 features of the invention will be particularly pointed out in the appended claim.

My invention is illustrated in the accompanying drawings, forming part of this application, in which Figure 1 is a rear view of an envelope with the adhesive applied thereto,

Figure 2 is a view of a portion of an en velope after it has been opened and rescaled, and

Figure 3 is a view of a blank for making a box and having adhesive applied thereto which does not require water for effective sealing of the parts of the box.

In carrying out my invention, I may make use of a blank for forming an envelope of the ordinary shape. Thus in Figure 1, A is the main body portion, and B, C and D are the flaps which are integral therewith, 45 and which, when folded, form the main conapplication filed January 14, 1926, Serial 1T0. 81,277. Renewed September 30, 1829.

tainer. The flap E, when sealed, completes the envelope.

On the edge of the flap E, I dispose a sealing material F. This material is pref 'erably some adhesive which does not require moistening, such as a rubber solution. Thus a solution of rubber in chloroform or benzol is welladapted for the purpose.

A similar coating G is applied to the back of the envelope so that when the flap is folded over, the coatings F and G will register. I have found that if the paper has a smooth surface, the .adhesive will adhere better by roughening the paper before the adhesive is applied. An envelope thus applied with adhesive of the type described does not have to be moistened, because it is only necessary to press the flap against the back portion-of the envelope to cause the two coatings F and G to adhere and to make a firm seal for the envelope. This obviates the necessity of moistening the ummed surface as is ordinarily done, and does away with the unsanitary method of licking the envelope.

In Figure 3, I have shown a modified form, which, in this instance, is a blank for use in making boxes. Obviously, the adhesive material might be applied to blanks of other shape than that shown for making boxes without departing from the spirit of the invention. In the present instance, the body portion H of the box has the flaps K, R, M and P. The flaps R and P have auxiliary portions 7'. The ends of the flaps K and M are coated with the adhesive on one side, while the portions r are coated with solution on the opposite side. The boxes, or rather the blanks from which they are made, are shipped to the consumer flat, and in order to prevent the sticking of the adhesive, I may make use of sheets of paraffin paper or the like.

In making the box, all that is necessary is to bend up the sides M and K, R and P,

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and bring the end portions 1', wl'iich have been treated with the adhesive on one side, into engagement with the adhesive covered ends of the portions M and K, thus causing the sides to adhere so as to complete the body portion of the box. In this form of the device, as well as the envelope, no moisture is required for effecting the firm sealing of the parts.

In the case of the envelope, I have provided means whereby any attempt at opening the envelope and rescaling it will be detected. This consists in impressing either before or after applying the adhesive a design or trade mark, such as that shown at V in Figure 1. This may be either upon the flap or upon the parts to which the flap is to be scaled. Owing to the fact that the envelope cannot be opened by steaming it, any opening of the envelope by an unauthorized person who wishes to escape detection, must be by pulling outwardly on the flap E. Even should he succeed in separating the parts without tearing them, a portion of the design will be broken; that is to say, part of it may remain intact on the flap, while the other part will adhere firmly to the coating G and the paper will be torn so as to cause a parting of the design. In order to reseal the flap, it is necessary to bring it down again-over the treated portion G, or to recoat the parts to cause their adherence. It is impossible to bring the separated parts of the design into registration, so that by holding the envelope up to the light, one can see, as shown in Figure 2, that the design is not continuous, and hence that the envelope must have been open. In certain instances, in order to facilitate detection, I may use paper which is comparatively thin or transparent.

I desire to call attention to the fact that such a device for detecting the unauthorized opening of the envelope will not apply to the mucilage-sealed envelope, because when such an envelope is opened by steaming it, the desi n, especially if printed on the paper before t 1e coating is made, will not be torn or broken, but it will be broken with an adhesive, such as I have described.

In shipping these envelopes, I may make use of strips of paraffin paper, or the like, which may be placed between the two adhesive surfaces for preventing the sticking of the same inadvertently. These strips are of course removed when it is desired to seal the envelope which may be done,,as stated, by merely pressing the parts together.

I claim:

An envelope comprising a body portion having overlapping flaps secured together, a cover flap, said overlapping flaps and said cover flap having roughened registering portions, an adhesive coating insoluble in water carried by the-inside edge of the cover flap and on the outer side of the overlapping

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