Getter and electrical switching system using such getter

Details Getter and electrical switching system using such getter Getter and electrical switching system using such getter

1982-03-30

1984-02-07

Shepperd, John W.

Electricity: circuit makers and breakers

Electric switch details

Cases and bases

H01H 904

Patent

active

044305370

ABSTRACT:
A getter for use in a sealed contact chamber consists of a porous getter material which acts to adsorb substances which could create resistive films on electrical contacts. By disposing such a getter within the contact chamber of a switching device, such as an electromagnetic relay, molecules of, for instance, organic compounds, may be selectively and over long terms adsorbed to the getter and thus kept away from the contacts. The selective adsorption of such molecules is achieved by a porous getter material in which the majority of the pores have diameters greater than 3 nm and smaller than 100 nm, with the mean value of pore diameter ranging from about 7 nm to about 20 nm. The getter material may be substantially Al.sub.2 O.sub.3.

REFERENCES:
patent: 3508021 (1970-04-01), Bellis
patent: 3829632 (1974-08-01), Klehm, Jr.
patent: 4360444 (1982-11-01), Esterl et al.
Siemens Components 19 (1981) Heft 5, Josef Weiser, "Hohe Kontaktzuverlassigkeit des Kleinrelais D1 Durch Getter", pp. 157-160.

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