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The ornamental design for a vacuum filter flask, as shown and described. |
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FIG. 1 is a top view of the disclosed vacuum filter flask;
FIG. 2 is a front view of the disclosed vacuum filter flask;
FIG. 3 is a side view of the disclosed vacuum filter flask;
FIG. 4 is an opposite side view of the disclosed vacuum filter flask, the back of the disclosed vacuum filter flask is a mirror image of FIG. 2;
FIG. 5 is a bottom view of the disclosed vacuum filter flask;
FIG. 6 is a broken away cross-sectional view of the lower portion of the disclosed vacuum filter flask;
FIG. 7 is a top view of the disclosed vacuum filter flask having the cover and filter element removed; and,
FIG. 8 is a broken away cross-sectional view of the middle portion of the disclosed vacuum filter flask.
Cattaoris, Henry L., Dyda, Michael A., O'Connell, Dennis M., Takatori, Frederick B.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Nov 08 1991 | CATTADORIS HENRY J | Corning Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST | 006132 | /0478 | |
| Nov 08 1991 | DYDA, MICHAEL A | Corning Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST | 006132 | /0478 | |
| Nov 21 1991 | O`CONNELL, DENNIS M | Corning Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST | 006132 | /0478 | |
| Nov 25 1991 | TAKATORI, FREDERICK B | Corning Incorporated | ASSIGNMENT OF ASSIGNORS INTEREST | 006132 | /0478 | |
| Dec 02 1991 | Corning Incorporated | (assignment on the face of the patent) | / |
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