US1245100A - Window-envelop. - Google Patents

Description

C. J. GUTBERLET.

WINDOW ENVELOP.

APPLICATION FILED JULY'5. 1911.

Patented Oct. 30, 1917.

Fig. 5

a Fig. 5.

CHARLES J. GUTBERLET, OF PHILADELPHIA, PENNSYLVANIA.

WINDOW-ENVELOP.

Application filed July 5, 1917.

To all whom it may concern:

Be it known that I, CHARLES J. GUTBER- LET, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in lVindow-Envelops, of which the following is a specification.

The present device has the window integral with and at or below the level of the body of the envelop and by the construction of the window, it is supported by and integral with a frame of sturdy paper, so that the ordinary paper of envelop manufacture can be used, and the window nevertheless can be made completely transparent without taking away from the envelop its necessary strength on the window face. The envelop is also without any obstruction to the insertion of the inclosure, which is important notonly because of the inconvenience produced by any obstruction in inserting the inclosure, but also because the window may be torn by the effort to insert the inclosure forcibly against an obstruction. The process by which the envelop is manufactured is also very simple and efficient.

Figure 1 is an elevation showing the face of the envelop, Fig. 2 is a side section on the line wa2 of Fig. 1. Fig. 8 is a greatly enlarged sectional view of the portions of the face of the envelop having the frame and the window. Fig. 4 is a like view showing a slightly modified form of the window and frame, and Fig. 5 is a plan view of the instrument for treating the window to render same transparent.

The envelop may be of any suitable paper stock and shape. It is shown in the conventional form with face 2, sealing flap 1 and back flaps 4 and 5. The window 3 is located where the address would ordinarily be placed on the envelop. This window is much thinner than the rest of the envelop and its surfaces both inside and outside the envelop are highly polished. It is integral with the frame and depressed (as shown in Figs. 2- and 3) below the surface of the frame on the inside as well as the outside of the envelop. The faces of the window are parallel planes, which is important as the window should be of equal strength throughout, and, besides, the making of these surfaces parallel planes adds materially to the windows transparenty. The window is Specification of Letters Patent.

Patented Oct. 30, 1917.

Serial No. 179,977. Y

joined to the frame with sloping shoulders {land 7, which give strength and make the inclosure slip in easily and the face of the envelop slip easily over another envelop.

Transparency is given to the window by treating it with a transparent filler and then preferably polishing the surfaces. The filler is of a glutinous as well as oily nature so that a rigidity and strength is given to the window much greater than would be given by merely the paper fiber itself. This filler is carried all the way to the shoulders and over them. The best material is a heavy white mineral oil with a parafiin base. If the thinning of the paper fiber to form the window and the additional stiffening and strengthening given by the filler are properly balanced, the whole face of the envelop, including the window will have an equal strength and rigidity throughout. In Fig. 4. is shown a form where the thinning of the paper to form the window is only on one side of the face of the envelop. 12 is the portion of the face of the envelop, 16 and 17 the shoulders and 13 the-window.

The process of producing this envelop is as follows :The blank has the window skived or ground out, which can be done by automatic machinery or by a revolving cutter of very fine emery or carrying revolving knives or even by skiving it out, and the window is then treated with the filler by dipping into the latter the stamp shown in Fig. 5, the plate 14 of which is preferably made of a. porous material such as sandstone. The face of this stamp should fit exactly the window shape so that it will register with it and cover it but not extend over the frame. This stamp, when the making of the window is not done by automatic ma- 'chinery is dipped into the filler and taken by the handle 15 and pressed upon the window of the blank. The blank is then allowed to dry. Either before or after the application of the filler the surface of window is polished.

I claim l. A window envelop, having the window formed of the paper constituting the face of the envelop but thinner than the rest of the envelop face and integral therewith, the opposite surfaces of the window being parallel planes and polished, and said window having shoulders connecting the same with the face of the envelop, formed of paper integral with the window and the envelop face, and having the Window up to the Ehoulders filled with a transparent tenacious ller.

2. A WlIldOW' envelop, having the-WindoW formed of the paper constituting the face of the envelop but thinner than the rest of the envelop face and integral therewith, the 0pposite surfaces of the Window being parallel planes and polished and integral therewith, and said Window having shoulders connecting the same with face of the envelop, formed of paper integral With the Window and the envelop face, and having the Window up to the shoulders filled with a heavy oil with a paraflin base. i

3. The art of making Window envclops,

Which consists in subjecting the blank to a CHAS. J. GUTBE RLET.

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