(under subclass 554) Subject matter wherein the plural getters include at least two different elements, or compounds, or an element and a compound within the envelope of the electric lamp or discharge device.
(1) Note. A getter may change an element or a compound within the sealed envelope into other substances and a second getter may in turn change the resulting products of the first gettering action into other chemical substances.
(2) Note. Here the plural diverse getters may be in name only and may affect the same unwanted element or compound within the envelope.
