Evacuation of vacuum and gas filled envelopes

Claim 1

A METHOD OF EXHAUSTING A VACUUM ENVELOPE, INCLUDING THE STEPS OF DISPOSING FIRST AND SECOND FLASH GETTERS COMPRISING BARIUM AND TITANIUM RESPECTIVELY IN COMMUNICATION WITH THE INTERIOR OF THE ENVELOPE TO BE EXHAUSTED, REDUCING THE PRESSURE WITHIN THE ENVELOPE TO A POINT AT WHICH THE GETTERS CAN BE USED, FLASHING THE FIRST GETTER, AND FLASHING THE SECOND GETTER AFTER AN INTERVAL OF TIME SUFFICIENT TO ALLOW A SUBSTANTIAL REDUCTION IN THE RATE OF FALL OF PRESSURE FOLLOWING THE FLASHING OF THE FIRST GETTER, WHEREBY THE FLASHING OF THE BARIUM-CONTAINING GETTER REDUCES THE AMOUNTS OF GASES FOUND IN THE EARLY STAGES OF EXHAUST WHICH WOULD INHIBIT THE OPERATION OF THE TITANIUMCONTAINING GETTER AND THE TITANIUM-CONTAINING GETTER THEN FURTHER REDUCES THE PRESSURES IN THE ENVELOPE, BEYOND THE LIMIT OBTAINABLE WITH THE BARIUM GETTER.

Claim 2

A METHOD OF EXHAUSTING A VACUUM ENVELOPE, INCLUDING THE STEPS OF DISPOSING FIRST AND SECOND FLASH GETTERS COMPRISING BARIUM AND TITANIUM RESPECTIVELY IN COMMUNICATION WITH THE INTERIOR OF THE ENVELOPE TO BE EXHAUSTED, REDUCING THE PRESSURE WITHIN THE ENVELOPE TO A POINT AT WHICH THE GETTERS CAN BE USED, FLASHING THE FIRST GETTER, AND FLASHING THE SECOND GETTER AFTER AN INTERVAL OF TIME SUFFICIENT TO ALLOW A SUBSTANTIAL REDUCTION IN THE RATE OF FALL OF PRESSURE FOLLOWING THE FLASHING OF THE FIRST GETTER, WHEREBY THE FLASHING OF THE BARIUM-CONTAINING GETTER REDUCES THE AMOUNTS OF GASES FOUND IN THE EARLY STAGES OF EXHAUST WHICH WOULD INHIBIT THE OPERATION OF THE TITANIUMCONTAINING GETTER AND THE TITANIUM-CONTAINING GETTER THEN FURTHER REDUCES THE PRESSURES IN THE ENVELOPE, BEYOND THE LIMIT OBTAINABLE WITH THE BARIUM GETTER.