Lamp with an oxygen detector

Details Lamp with an oxygen detector Lamp with an oxygen detector

1990-07-12

1992-07-07

Johnston, Jill A.

Chemical apparatus and process disinfecting, deodorizing, preser

With indicating, signalling, recording, sampling, or...

422 86, 422 87, 422 94, 313552, 313557, 313558, 313562, 445 3, 116206, 73 3105, 73 52, 73 493, G01D 1126

Patent

active

051281066

ABSTRACT:
An oxygen detector for use in a double envelope lamp is described. The detector may be formed by nitriding a metal surface to produce a metal piece with a first visual color or state. The surface thickness is sufficient to exclude oxygen during normal assemble, but thin enough to change colors during lamp operation if oxygen is present.

REFERENCES:
patent: 2489261 (1949-11-01), Braunsdorff
patent: 3626742 (1971-12-01), Hogan et al.
patent: 4127790 (1978-11-01), Kuus et al.
patent: 4450428 (1984-05-01), Ohta et al.

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