Method of sealing and evacuating vacuum envelopes
Abstract
Abstract THE TWO INSULATING CASINGS OF A VACUUM ENVELOPE ARE PLACED IN CLOSE PROXIMITY, AND A PLURALITY OF SPACED USHAPED BRAZING SHIMS ARE DISPOSED IN SPACED RELATION AROUND AN ANNULAR BRAZING SHIM, THE LATTER BEING POSITIONED BETWEEN THE CONFRONTING ENDS OF THE TWO CERAMIC, OR INSULATING RINGS CONSTITUTING THE ENVELOPE OF THE ENCLOSURE. THE ENVELOPE IS PLACED WITHIN A VACUUM FURNACE AND HEATED TO A TEMPERATURE JUST BELOW THE MELTING TEMPERTURE OF THE U-SHAPED BRAZING SHIMS. IN EFFECT, THIS CREATES A PERIPHERAL OPENING PERMITTING THEREBY A COMMINICATING PASSAGE BETWEEN THE INTERIOR AND THE EXTERIOR OF THE ENVELOPE FOR OUTGASSING PROCEDURES. WHEN THE DESIRED DEGREE OF OUTGASSING AND EVACUATION HAS OCCURRED, THE TEMPERATURE OF THE VACUUM FURNACE IS RAISED TO THE MELTING POINT OF THE PLURALITY OF SPACED BRAZING SHIMS, AND THEY MELT FLOWING INTO THE SPACE BETWEEN THE TWO CERAMIC OR INSULATING CASINGS, AND SEALING THE SAME TOGETHER. NO TUBULATION IS NEEDED WITH THIS METHOD.
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| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
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